10mm single dynamic driver. As audiophiles ourselves, we know exactly what you want from a pair of in ear monitors- Great Sound Quality and Lasting Durability. Thus, we set out to create a pair of earphones with these objectives in mind.

Alpha & Delta D6

  • d63.jpg

    Sound: Balanced Sound signature with a good sound stage
    1) 10mm dynamic driver: Our custom tuned 10mm dynamic driver satisfy the High Res Audio standard ensuring great clarity and a balanced sound signature.

    2) High Definition sound stage: In order to achieve a spacious sound stage, we adopted a Dual Air Chamber acoustic Design and licensed the High Definition Sound Standard (HDSS (www.hdss.com). Both technologies serves to reduce distortion in earphones, improving clarity and soundstage. (more information below)

    3) Eight Core silver plated copper (SPC) cable: Our 8 copper silver plated copper cable allows greater signal transmission, ensuring great clarity.

    Durability- Built to Last! 3 years warranty!
    1) Eight Core silver plated copper cable: Most earphones use the 4 core cable. Once breakage occurs in one of the cables, the earphones cease to function. However, our 8 core (SPC) cable ensures that the earphones continue to function even when one of the cable breaks.

    2) Reinforced Strain relief and Spring protected 3.5mm jack: The D6 is reinforced at the y-split and at the earphone's housing. Moreover, the vulnerable 3.5mm jack is protected by a spring to ensure it can withstand any impact.

    3) Three years warranty: We take pride in our workmanship and believe that we have taken the necessary measures to ensure the earphones are durable for daily use. Thus, we provide 3 years warranty as a testament to our efforts.

Recent Reviews

  1. B9Scrambler
    Alpha & Delta D6: Challenging "The King"
    Written by B9Scrambler
    Published Apr 6, 2018
    Pros - Stellar materials, fit and finish - Crisp, clear sound - Overall value (balance of sound, build, and accessory quality)
    Cons - Broad housings - Sub-bass extension/emphasis are slightly lacking

    Today we're checking out Alpha & Delta's flagship earphone, the D6.

    Alpha & Delta (A&D) is the in-house brand of the popular retailer out of Singapore, Lend Me Ur Ears. The brand was launched with a simple but rugged sports earphone, the D2, which was well-received within the portable audio community. That was followed up by the dual dynamic AD01 which warmed the hearts and ears of many. Since then, the brand has expanded further with a number of new products. The D3 features a 6mm micro-driver which puts out one heck of a low end. The JAAP is a fully wireless Bluetooth earphone with competitive specifications like an achievable 6 hours of battery life. Last but not least is the audiophile targeted D6 that we're checking out today.

    The D6 features single 10mm dynamic drivers per side with an 8 core, silver-plated copper cable connecting them to your playback device. A&D has also licensed HDSS and dual-chamber tech for use in the D6, something I am familiar with from my time with Blue Ever Blue's products. Now, I can't definitively say that the HDSS effect is in play since for that we would need identical models to compare, one with and one without HDSS. That said, I can confirm that the D6 shares qualities with other HDSS and dual-chamber equipped earphones I've got, and that's a good thing. In addition to the developments made to craft a good sounding product, A&D is also obviously confident in the quality of their materials and workmanship. The D6 is backed by a three year warranty, something that's not particularly common in the industry.

    So, does the D6 stand tall as Alpha & Delta's current flagship, or is it a has-been with some neat tech but mediocre sound? Let's find out.



    A big thanks Dennis with Alpha & Delta for reaching out to see if I would be interested in reviewing the D6, and for arranging a sample unit. All thoughts within this review are my own and do not represent A&D or any other entity. There was no financial incentive provided.

    At the time of this review the D6 could be picked up for 133 SGD or 94.68 USD here; http://www.lendmeurears.com/alpha-delta-d6/?setCurrencyId=2

    Personal Preferences:

    I listen primarily to various EDM sub-genres (liquid drum and bass, breakbeat, drumstep, etc.), hip hop, and classic rock. While I enjoy a variety of signatures in my headphones I generally lean towards slightly warm with elevated treble and sub-bass, an even and natural mid-range response, with reduced mid-bass. The HiFiMan RE800, Brainwavz B400, and thinksound On2 offer unique examples of signatures I enjoy.


    For at home use the D6 was powered by a TEAC HA-501 desktop amp or straight out of my Asus FX53V laptop. For portable use it was paired with an LG G5, HiFiMan MegaMini, or Shanling M1. The Walnut F1 also made it's way into the rotation at times. The D6 was exceptionally easy to drive.

    • Driver unit: 10mm dynamic driver
    • Impedance: 16 ohm
    • Rated power: 1mW
    • Frequency Response: 10 Hz - 70 Khz
    • Speaker Sensitivity: 105+/- 3db
    • Cord Length: 1.2m silver plated copper cable (each core contains 22X 0.05 silver plated copper wires)
    • Plug: 3.5 mm
    DSC02864.JPG DSC02863.JPG DSC02880.JPG

    Packaging and Accessories:

    The D6 doesn't come in any sort of packaging that's going to blow you away with layers of intricacy or upscale styling. Nope, it's pretty basic. The base grey cardboard box lists on the back the contents and accessories along with the specifications. The entire front is a clear plastic viewing window showing off the earphones nestled within a foam insert. Lifting out the viewing window reveals a gorgeous leather carrying case containing the rest of the accessories, of which there are many. In all you get;
    • D6 earphones
    • Leather carrying case
    • Leather cable tie
    • Silicone ear guides
    • 3 sets of single flange silicone ear tips in s/m/l (9 pairs total)
    • 1 pair of foam ear tips
    • Shirt clip
    It seems like A&D made a trade off; inexpensive packaging in exchange for plenty of quality accessories. That's a trade off I'm perfectly happy with. The case and cable strap feel great, the ear guides are handy for over-ear wear, and the tips are all different so the variety make sense. Good stuff here.

    DSC02867.JPG DSC02885.JPG DSC02889.JPG

    Build, Comfort, and Isolation:

    Alpha & Delta back this earphone with a solid warranty, and I can see why; it's very well-constructed. The metal housings are a dark gunmetal chrome with design inspiration taken from ammunition in the placement of the various ridges and channels. While fairly large, they are quite light and all edges are rounded off so there are no sharp edges. This is great for comfort because the nozzle is a touch on the short side meaning the inner edge of the housing is likely to lean against your ear. Other earphones built like a similar girth that do not have rounded edges cause hot spots and mild outer ear pain. Not an issue I've come across with the D6.

    The cable is the real show stopper though. The D6 uses a wonderful braided eight core, silver plated copper cable. The sheath has a slightly gummy and grippy feel to it that holds on to skin quite effectively, yet slides over clothing with little resistance. This makes the included ear guides a little redundant in my opinion, as the cable sits very securely around you ear without them should you choose to wear them cable up.

    Strain relief is usually an area where I have some bones to pick. For the most part, the D6 is fine here. Leading into each ear pieces is a very KZ-esque rubber relief but with just enough give to make it effective. On the left side is a tiny little bump to indicate the left channel, something A&D reminds you of with a small strip of paper found in the packaging. This is a little too ambiguous for my liking, and would prefer if they just printed a small L and R somewhere on the ear pieces. The 90 degree angled jack goes with a tightly coiled spring instead of a more traditional rubber relief, something usually only found on much more expensive products. The y-split's relief isn't fantastic being that it is so stiff there is next to no flex. Still the cable feels durable enough to make this less of a concern than it otherwise would be.

    In terms of isolation, the D6 is flat out average and won't be winning any awards. Using them at work I could hear keyboards clattering away, murmuring, etc. Using them outside, cars are well present, as are other noises. These would be fine for walking around in a grocery store or going to the shop, but for transit? I'd be looking elsewhere.

    HDSS (High Definition Sound Standard):

    This tech boasts some interesting claims, such as a clinically tested and approved 14.32 reduction in psychological stress, detailed 3D sound reproduction, and virtually no distortion. While I'm not going to state my thoughts on some of those claims, I will state that I have tried quite a few earphones with HDSS and their dual-chamber tech, all from Blue Ever Blue. Ear fatigue seems to be vastly reduced as there is next to no back pressure once you've got a good seal. My time with the D6 mirrors my past experiences with BeB's HDSS equipped products. Those that are big on protecting their ears and hearing might want to keep the D6 in mind.

    DSC02892.JPG DSC02895.JPG DSC02899.JPG


    The D6 is a very coherent sounding earphone with a well-balanced signature, blending bass, treble, and mids wonderfully. Treble is uncharacteristically smooth and tight for something in this price range, especially if you've become accustomed to the rarely filtered sound of BAs used in budget hybrids. It is calmly accentuated with mild peaks in place to give it's upper ranges a very specious and ethereal presentation. Attack and decay are quick, but not so quick that lingering notes trail off too quickly. Detail and clarity are above average for a single dynamic, and serve listeners well by giving them lots of information about what's going on in any given track.

    The mid-range is much the same though it has a touch more warmth to it. Timbre is spot on with instruments and vocals sounding as they should. What gets me most is how smooth vocals sound while still retaining a level of coherence you'd usually associate with a leaner sounding earphone. Throwing on “Beat It” by Michael Jackson, the awesome guitar solo is crisp and texture, though not quite as forward as it is through other similarly tuned products like the Blue Ever Blue 1200EX. It also lacks some weight and presence. The D6 fairs much better with “Billy Jean” and other tracks rich with synth work.

    Bass on the D6 is elevated slightly over neutral with great texturing and decent extension. The balance between mid- and sub-bass is quite even, with neither taking on a larger presence. The D6's bass doesn't have a ton of slam or authority to it, going more for a detailed presentation than visceral. Not really my preference, but it works in conjunction with the way the mid-range and treble are presented. They're certainly not a bassy earphone, but they're got more umph down low than your typical BA only product, and some other single dynamic models like the Whizzer A15 Pro Haydn.

    Another area the D6 stands out to me is sound stage, a quality I find common among other HDSS equipped earphones like the aforementioned 1200EX and 2000EX. It might be the dual-chamber design and/or plain old good tuning, but whatever it is gives the D6 a wonderfully open presentation that has no issues throwing sounds a good distance from my head. Listening to Infected Mushroom's “Groovy Attack” is a trip as effects flash around the stage. This also serves to highlight some impressive layering. Congestion is avoided as a result of quality separation as evidence when listening to King Crimson's “Starless and Bible Black”. After an agonizing 4 minute build, the track shifts gears with a mild blowing jazz attack that can get messy with poorly separated earphones. Not the D6.

    Select Comparisons:

    (Volumes matched as best as possible with the Dayton Audio iMM-6)

    Blue Ever Blue 1200EX (105.00 USD): Like the D6, the 1200EX features HDSS with dual-chambers. The 1200EX's housings are a mix of metal and plastic with an extended nozzle section designed to hold the various stabilizing ear hooks that come with it. Because of this design and the angled nozzles, the 1200EX meant for cable down wear only, unlike the D6's more universal barrel shape which works cable up or down. I quite like the 1200EX's cable which has a very dense, durable shealth, but it's slightly stiff (especailly so in the cold) and isn't quite as well relieved. Overall build quality goes to the D6 with it's more impressive materials along with better fit and finish. The 1200EX's shell does fit my ear a little better though.

    In terms of sound the two have slightly different takes on the same signature. The D6 is a touch thinner and more skewed towards upper mids and lower treble giving it a bit more sparkle and air. The D6's mid-bass is maybe a dB or two more emphasized compared to the 1200EX. Neither has particularly prominent sub-bass, but I'd give the edge to the 1200EX. The 1200EX's mid-range is slightly more articulate but equally present. It has a slightly drier texture that I feel gives it the edge with male vocals. In terms of sound stage, layering, and separation I couldn't really hear much of a difference, though imaging felt more accurate through the D6. Texture and detail between the two was again more or less equal.

    TFZ Exclusive King (99.00 USD): The King's housings are mostly plastic with a metal faceplate. Fit and finish is quite good, but falls short of the D6. There is a notable gap between the faceplate and rest of the ear piece which hides some vents. The D6's build is tighter and more consistent. The King is is a very large earphone that takes up pretty much the entirety of you outer ear and is designed for over ear wear only. If you have small ears or like to wear your earphones cable down, the D6 will better meet your needs. In terms of cables, the King's cable is a much thinner braided option. It is replaceable though, terminated in a 2-pin connector. The D6's cable is nicer, but fixed.

    Just as with the 1200EX, the King and D6 have different takes on the same signature. The King's upper treble is slightly more emphasized but not as smooth and articulate. The King has a more forward, detailed, and textured mid-range than the D6. The King's low end definitely has more punch to it. It hits harder, feels tighter, and is more layered and textured. It also extends deeper with more sub-bass emphasis, and a dialed down mid-bass region. The King is more in-your-face than the D6.


    Final Thoughts:

    Alpha & Delta's D6 is a strong entry in the ~100 USD market with a fairly balanced signature that is lightly treble-leaning; one that is very detailed, smooth, yet decidedly non-fatiguing. It could use a touch more sub-bass extension and emphasis for my tastes, but as-is is still quite pleasing. That it goes toe-to-toe and blow-for-blow with the Blue Ever Blue 1200EX and TFZ Exclusive King, two of my favorite earphones in this category, says a lot about how capable the D6 is.

    While the shiny gunmetal chrome look isn't for everyone, you can't deny that it was executed exceptionally well. The D6's material quality and fit and finish is impressive as well, with good comfort too despite being a little on the bulky side. Many would think the D6 would benefit from a removable cable, however, the fixed cable that is on there is absolutely gorgeous and is well-relieved. It feels like it will last.

    If you're looking for a strong performer around 100 USD, be sure to look into the D6. Thanks for reading!

    - B9Scrambler

    ***** ***** ***** ***** *****

    Some Test Tunes:

    Aesop Rock - Skelethon (Album)
    Daft Punk - Random Access Memories (Album)
    Elton John - Yellow Golden Brick Road (Album)
    King Crimson - Lark's Tongues in Aspic (Album)
    King Crimson - Starless and Bible Black (Track)
    Supertramp - Crime of the Century (Album)
    Infected Mushroom - Converting Vegetarians (Album)
    Infected Mushroom - Legend of the Black Shawarma (Album)
    Gorillaz - Plastic Beach (Album)
    Massive Attack - Mezzanine (Album)
    Fleetwood Mac - Rumors (Album)
    Run the Jewels - Run the Jewels (Album)
    The Prodigy - The Day is My Enemy (Album)
    Tobacco - F****d Up Friends (Album)
    Felt - Felt 2 (A Tribute to Lisa Bone) (Album)
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  2. Moonstar
    Jazz sounds now better than before
    Written by Moonstar
    Published Mar 29, 2018
    Pros - Crystal Clear Sound,
    Airy Presentation,
    Build quality,
    Great Cable
    Cons - No detachable cable,
    Missing some bass between 50-120 kHz
    Alpha & Delta D6; Jazz sounds now better than before...

    1. Introduction:

    Alpha & Delta is a Singapore based brand that was founded of audiophiles with experience in the earphones retail industry. The D6 is the latest model of this company and there are also some few other models like AD01, D3, JAAP (wireless model) etc. that targets different users.


    2. Disclaimer:

    I would like to thank Alpha & Delta for providing me the Alpha & Delta D6 as a free of charge review sample. I am not affiliated with Alpha & Delta beyond this review and these words reflect my true, unaltered, opinions about the product.

    3. Price & Warranty:

    The MSRP price for the Alpha & Delta D6 is 95.00 USD and has a 3 Years Warranty.

    Purchase Link: https://www.alphandelta.com/shop

    4. Package and Accessories:

    The Alpha & Delta D6 comes in a black card box with a transparent plastic front cover.

    This box includes the following contents;

    • 1 x pair of ear guides
    • 1 x shirt clip
    • 1 x pair of foam tips
    • 9 x pairs of silicon ear tips
    • 1 x leather case
    • 1 x leather cable wrap
    The silicone ear tips included in the box are comfortable and the foam tips are a nice addition.

    20180319_233213.jpg 20180319_230942.jpg

    The box includes a leather wrap and leather case that are looking very nice and are quite useful. There is also 1 pair of Ear-Guide and a shirt clip that is also a nice addition.


    5. Design, Build Quality and Fit:

    The Alpha & Delta D6 is a very well made IEM with a bullet-style metal shell, which has a glossy gunmetal painting. At the back of the monitor are the AD (Alpha & Delta) logo and the HDSS (High Definition Sound Technology) printing. On the top and on the nozzle are two holes that serve as bass vent. The nozzle of the monitor is not angled and has a fine black filter.

    20180319_231352.jpg 20180319_231858.jpg

    The D6 is lightweight, fits comfortably in my ear and has an above average isolation.

    The Alpha & Delta D6 has a non-detachable cable, which in my opinion one of the best in the market, especially for a IEM with a price of 95 USD. Alpha & Delta decided to use a wonderful looking 8 core Silver Plated Copper (SPC) cable, instead of a regular 4 core design. This ensures, according to Alpha & Delta, that the earphone continues to work, even if one of the cables breaks.


    The D6 is reinforced at the y-split and at the earphone's housing. Moreover, the vulnerable 3.5mm jack is protected by a spring to ensure it can withstand any impact.



    6. Specifications:

    • Driver Unit : 10mm dynamic driver
    • Impedance : 16 ohm
    • Rated power : 1mW
    • Frequency Response : 10 Hz- 40 Khz
    • Sensitivity : 105 +/- db/ mW
    • Cable : 1.2m silver plated copper cable (each core contains 22X 0.05 silver plated copper wires)
    • Plug : 3.5mm Gold Plated Plug

    a. About HDSS High Definition Sound Technology:

    Speakers create sound through vibration. Due to the small enclosure, the reflected sound waves can distort our music by interfering with the sound waves entering our ears. HDSS technology removes these reflected waves to ensure crystal clear sound. The removal of reflected waves also allows speakers to disperse sound coherently, allowing for a naturally projected sound stage.

    b. About Dual Chamber Acoustic Design:

    The dual chamber acoustic design redirects reflected sound waves into a uniquely designed second chamber which absorbs these sound waves. This reduces distortion and improves the clarity and soundstage of the earphones.


    7. Albums & tracks used for this review:

    • Saskia Bruin – The Look of Love (DSF)
    • Diana Krall - So Wonderful (DSF)
    • Aretha Franklin – I Say a Little Prayer (Apple Music)
    • Melody Gardot – Who Will Comfort Me (Flac 16bit/44kHz)
    • LP (Laura Pergolizzi) – Lost On You “Live at Harvard and Stone” (Tidal Hi-Fi)
    • Mile Davis – Kind of Blue Album (Tidal Hi-fi)
    • George Michael – Older Album (Apple Music)
    • Dire Straits – Money For Nothing (DSF)
    • Emmanuel Pahud (Claude Debussy) – Syrinx (Apple Music)
    • Otto Liebert & Luna Negra – Up Close “Album” (DSF) – Binaural Recording
    • Alboran Trio – Autumn Mist (Tidal Hi-Fi)
    • GoGo Penguin – Fanfares (Tidal Hi-Fi)
    • Opeth – Damnation (Tidal Hi-Fi)
    • Megadeth – Sweating Bullets (Flac 16bit/44kHz)
    • Daft Punk – Get Lucky (Flac 24bit/192kHz)
    • Future Heroes – Another World (Tidal Hi-fi)
    • Michael Jackson - Billie Jean (DSF)

    8. Sources used for this review:

    • IEM : Alpha&Delta D6, Pinnacle P2, TFZ Series 4
    • DAP/DAC : Cayin N5II, HiBy R6, Chord Mojo, Audirect Whistle


    9. The Sound:

    I am of the sort of people that believes in burn-in and this review is written after 100 hours. I have used the stock silicone ear tips (soft ones) that are included to the package.


    I was very surprised when I heard the Alpha & Delta D6 for the first time, because it was not a typical fun sounding IEM like many others in this price range. The D6 has a fairly neutral tuning with a tonality that is slightly on the thinner and colder side.


    The Alpha & Delta D6 sound very controlled at the sub-bass department. It doesn’t reach to the lowest register but has otherwise a pretty good clarity and extension.

    There is missing some body in the bass department between 50 – 120 kHz that gives normally warmth and fullness to the sound. Especial electronic music types such as trance, edm, etc. which are mostly based on artificially generated sounds are particularly affected by this tuning. But luckily, the D6 responds very well to equalizing and you can boost it anytime.

    The bass characteristic is suitable for classic, jazz, acoustic songs with live recorded instruments.

    The midrange of the D6 is impressive with its high level of clarity. I didn't expect such a detail level and crispness form an IEM in this price league. It sounds smooth, detailed and well placed and the separation of instruments is in a very good level.

    I have tested some songs with complex instrument passages like GoGo Penguin’s – Fanfares where are many instrument playing at the background at the same time and the Alpha & Delta D6 sounded pretty controlled.

    Both male vocals sounding quite realistic, but what really shines are female vocals like Melody Gardot and Laura Pergolizzi that are sounding clean and crisp with the D6.

    There was a bit stress in the upper midrange at the very beginning, but after some burn-in and right tips selection, it was almost gone.

    The treble range of the Alpha &Delta D6 sounds clear, crisp and well extended, without to be affected by sibilance. This was not the case at the very beginning; there was some sibilance for the first 10-15 hours that has gone after the next 50 hours.

    Notes are precise and accurate and the overall tonal balance is well done. Genres like classic, jazz, acoustic are sounding very life like and precise. The D6 did a good job while presenting Alboran Trio’s - Autumn Mist that sounded very accurate and lifelike.


    Soundstage and Imaging:

    One of the strengths of the Alpha&Delta D6 is the soundstage presentation, which sounds wide and fairly deep, that has also an excellent imaging and instrument placement for this price category.


    10. Comparison:

    Vs. Mee Audio Pinnacle P2:

    The Pinnacle P2 has a V-shaped sound signature with a consumer friendly tuning. The Alpha&Delta D6 on the other hand has a quite analytic sound tuning, which is suitable for critical listening.

    The Pinnacle P2 has more sub-bass; especially bass quantity between 50 – 120 kHz, but is missing some definition. The Pinnacle P2 has the same amount of mid-bass impact with nearly the same resolution that the D6 has.

    The midrange on the D6 sounds clearer and airier compared to the warmer and fuller tuning of the Pinnacle P2. Both IEM’s have a nice instrument presentation while the Pinnacle P2 is missing some speed in passages with high instrument density. Male and female vocals sounding a bit more natural and crisp due the brighter tuning of the Alpha&Delta D6.

    The Alpha&Delta D6 is a treble centric IEM, which sounds overall brighter with more sparkle and air on the top end. The treble and upper treble area of the Pinnacle P2 has a more even tuning, which results to a more balanced presentation. The Alpha&Delta D6 has slightly more detail retrieval and sounds also more refined.

    The Pinnacle P2 does its job in terms of soundstage, but the Alpha&Delta D6 is a step forward and has a wider and deeper soundstage presentation, where instruments have more space in complex passages. The Alpha&Delta D6 sounds also more precise in imaging and instrument placement.

    Vs. TFZ Series 4:

    The TFZ Series 4 has the same V shaped sound tuning like the Pinnacle P2 with a overall warmer sound tuning with higher bass presence. The D6 in the other hand is a treble centric IEM with an analytical tuning.

    The TFZ Series 4 has a nice bass presentation in the subbass and bass department with a pretty nice impact that makes it too a better option for electronic music genres like techno, trance and edm. The D6 on the other hand has the better bass extension, speed and definition that make it very suitable for live recorded songs like jazz, blues, acoustic genres.

    Both male and female vocals sounding fuller with the TFZ Series 4, but Alpha&Delta D6 has additional sparkle and transparency in the midrange department, which makes the listening of female vocals like Laura Pergolizzi and Saskia Bruin more exiting. The instrument reproduction of both IEM’s is quite good, but some string instruments like guitars have a more lifelike presentation with the D6.

    TFZ Series 4 sounds pretty good in the treble range with its soft and non aggressive tuning. The Alpha & Delta D6 has additional sparkle and extension in the treble department with overall extra resolution. The upper treble range of the TFZ Series 4 is well controlled but is missing some fine definition compared to the D6.

    TFZ and Alpha&Delta are nearly similar in soundstage performance but the D6 has additional wideness with better overall imaging and instrument separation.

    11. Conclusion:

    The Alpha & Delta D6 is an IEM that is focusing on clarity and soundstage with its treble centric presentation that is wonderful done. It has also a solid build quality with a great accessories package that makes the Alpha & Delta D6 worth’s every penny.

    12. Summary (plus and minus):

    + Crystal Clear Sound
    + Airy Presentation
    + Build quality
    + Great Cable

    - No detachable cable
    - Missing some bass between 50-120 kHz


    This review was originally posted on "Moonstar Reviews" :
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  3. ostewart
    Crisp, Clean and Clear
    Written by ostewart
    Published Mar 24, 2018
    Pros - Build quality, clean sound
    Cons - Slight metallic tone, not a lot of body
    Firstly I would like to thank Alpha & Delta for sending me this sample for review, these received over 100hrs of burn-in before writing.

    *disclaimer: This sample was provided for the purpose of writing a review, no incentive was given to write a favourable review. All opinions expressed are my own subjective findings.

    Gear Used: Audio Opus #2 / Hidizs AP200 / Objective 2 amp > D6


    Tech Specs:

    • Driver unit: 10mm dynamic driver
    • Impedance: 16 ohm
    • Rated power: 1mW
    • Frequency Response: 10 Hz- 40 Khz
    • Speaker Sensitivity: 105 +/- db/ mW
    • Cord Length: 1.2m silver plated copper cable (each core contains 22X 0.05 silver plated copper wires)
    • Plug: 3.5 mm
    • MSRP: $99
    • https://www.alphandelta.com/

    Packaging, Build Quality and Accessories:
    The D6 come in a plastic and card box, it is very simple and aesthetically pleasing with specs on the back. You simply cut through 2 tape rings to remove the front plastic and you are in to the packaging. You can see the IEM’s through the front plastic packaging, they are held in a foam insert. The packaging is minimalistic, which I quite like. The accessories are held in the carry case which you will find in foam insert too.

    Build quality is simply superb on these, they come with a 3-year warranty, it shows Alpha & Delta are confident about the build. The housings are metal, the cable has excellent strain relief and is an 8-core silver plated copper cable. The cable uses a square braid, it’s substantial yet supple and terminates in a right angled jack. Overall I cannot fault the build quality of the D6.


    Accessory wise these come with a good array of tips, you get S, M and L in 3 different types of silicone single flange tips, along with a pair of M foam tips. You gear ear guides, a shirt clip, a leather carry case and a leather cable wrap. Overall a really good set of tips and accessories for the price.

    Comfort, Isolation, Cable noise and Driver flex:
    The D6 are quite a conventional shape, and should fit most ear shapes quite easily. I found them to fit best when you loop the cable up and over your ear, I didn’t need the ear guides to wear them like this comfortably. They fit with a medium depth insertion well, it can sometimes be hard to tell if you have a good seal though as they do not isolate very well. Overall the fit is secure and comfortable, I had no issues.


    Isolation is not their strong point, the IEM’s are heavily vented which allows a lot of outside noise in, these would not be my first choice if you are planning to use them in noisy environments. However if you want to maintain some sort of awareness when out and about, they are perfect.

    Cable noise is present when worn cable down, so the shirt clip should help with this, otherwise it is not an issue when worn over the ear.

    Driver flex is not an issue these have.


    Split into the usual categories with a conclusion at the end.

    Lows: The D6 take a more neutral approach to bass quantity, offering up a very tight and precise presentation that some may find a little lacking. The lows can still extend deep, but they are not boosted in volume. Kicks have good body behind them, they are quick and the transient response is very good. These would not be my first choice for EDM music, or modern pop, but tracks played on real instruments work very well. I think a tad more presence down low would suit some, and they do respond very well to EQ. Overall these are on the more neutral side of sound down low, and are not for those who enjoy a fuller bodied sound.

    Mids: The midrange is incredibly clear on the D6, subtle details really shine through and they are not influenced by the lows. The midrange is slightly forward and the detail coming through really is impressive, both male and female vocals come across with equal energy and clarity, the midrange is quite linear and there is very little sibilance to be detected in the upper midrange. The transition to the treble is smooth; the midrange lends its hand to rock music very well due to the clarity and also power behind guitars.

    Highs: The highs are very smooth on these, they are well presented with good energy and extension but they never become harsh. The highs are articulate injecting air and shimmer up top but without overdoing it. The only thing that is possibly a bit out up top is the timbre, the overall sound of the D6 is not one that is organic and natural, it leans towards a brighter more analytical sound and there is maybe a hint of metallic tone to it. They are a little colder sounding but without sounding harsh and fatiguing, they are quick and airy.

    The soundstage of the D6 is one of its strengths, the soundstage is much wider than most fully sealed IEM’s, I am guessing the venting helps here. The soundstage is wide with excellent imaging and placement too. There is superb separation of each instrument, and each instrument expertly fills its place within the soundstage.


    Conclusion: The D6 is not going to appeal to bass-heads, it is not one for modern pop, EDM and hip-hop/rap. But if you listen to rock, metal, jazz and music played on real instruments these come into their own. The slightly cool tonality expertly reveals micro-details with ease, and they have excellent transient response playing well with complex metal tracks. The midrange cannot be beaten at this price if you are looking for realism and detail. I can overlook the slight deficiency in body down low when the midrange is this good. So if you like a more detail oriented IEM, take a look into these as they definitely punch above their price point.

    Sound Perfection Rating: 8/10 (a slight metallic tinge up top, but incredible detail and linearity across the board make these superb)
      H T T and hqssui like this.
  4. audio123
    Alpha & Delta D6 - Exciting Times
    Written by audio123
    Published Feb 18, 2018
    Pros - Sub-Bass Extension, Clear Midrange, Crisp Treble.
    Cons - Detachable cable would be nice.

    Alpha & Delta is a Singapore brand that features a lineup consisting of AD01, D2 and JAAP that targets different users. The D6 is a newly released iem that utilises their own technology, HDSS high definition. I would like to thank Lend Me Ur Ears for this opportunity to review their latest iem, Alpha & Delta D6. At the moment, you can purchase the D6 from http://www.lendmeurears.com/alpha-delta-d6/ .



    • Driver unit: 10mm dynamic driver
    • Impedance: 16 ohm
    • Rated power: 1mW
    • Frequency Response: 10 Hz – 40 Khz
    • Speaker Sensitivity: 1055 +/- db/ mW
    • Cord Length: 1.2m silver plated copper cable (each core contains 22X 0.05 silver plated copper wires)
    Unboxing & Accessories

    The D6 comes in a black package with a transparent cover. At the front of the cover, it shows the description, brand name and model name. After removing the cover, there is a leather case which contains 1 pair of ear guides, 1 shirt clip, 3 packs of tips and 1 leather cable wrap. There is an instruction manual too. The overall packaging is nice.



    IEM Build & Design

    The D6 has a glossy gunmetal faceplate with the Alpha and Delta initials printed on it, “AD”. Below the initials, there is the HDSS technology name printed. It is in a different shade so it will contrast with the gunmetal colour. There is a vent at the top of the iem and near the nozzle. The iem has a circular shell with circular indents. It has a straight nozzle with a soft mesh for earwax prevention. The material used to make the D6 is aluminium. The iem has no detachable cable. The D6 is rather light weight and its design is quite simple. Overall, it is constructed well and fits in my ear comfortably.





    Cable Build & Design

    The cable is 8 core braided and there is strain relief on each side. On the strain relief, there is a L & R marking on the inside of the strain relief to differentiate between left and right. There is no memory wire area. Moving on to the y-splitter, it is circular and the housing is gunmetal in colour. There is strain relief at both ends. Lastly, the jack is 3.5mm right angled gold plated. The housing that extends from spring loaded strain relief is gun metal in colour while the housing that extends to the gold plated jack is matte black in colour. It is a good cable with a robust build and visual appeal.


    Sound Analysis


    The D6 has an excellent sub-bass extension with a great punch to it. The sub-bass extends itself well and I am able to feel the depth. Rumble is speedy and it is presented in the most engaging way. The bass decay is agile and each bass note keeps coming which helps to improve the overall dynamics. There is no lacking in body too and this does not compromise on the nature of it. Presentation is rather clean. There is a good mid-bass slam which helps to give the sound an extra punch. Bass is generally impactful and there is a smooth transition from the lows to the lower midrange.


    The midrange on the D6 is fun sounding. I feel there is a good quantity in the midrange. For the lower mids, it is slightly boosted by the lows. It is not hollow and male vocals are presented in a natural way. The upper mids is quite forward and female vocals shine with definition. There is crisp and I feel the quantity is sufficient for vocals to have a bite. Resolution on the D6 is good and the midrange operates in a clean and lively manner.


    The treble is extended well with a good mastery. It is tight and the finesse is there. There is good quantity to it with a slight sparkle for a punch. There is no sibilance and harshness. Although it is not the smooth kind of treble, it retains the liveliness with a very tight control so it will not be expressed as shouty. There is a good level of details retrieval and the amount of air rendered gives a lot of space so it does not sound congested.


    The D6 has a good width in its stage so you will get an open feeling. The width aids in the positioning of instruments and vocals. The depth is not close in and there is a good 3D feel with vocals intimacy being retained. There is a good natural expansion.



    Alpha & Delta D6 vs TFZ Exclusive King

    The D6 has less sub-bass quantity but its extension is greater than the King. It stretches deeper and the sub-bass reproduction is clean. Bass articulation is very similar. The D6 has more speed than the King and there is a better expression in the rumble. Rumble is pacey and the overall sound is more exciting. The mid-bass quantity on the King is more and there is more slam. In terms of the overall bass, the D6 is more exciting due to its quick decay. The lower mids on the King has more quantity than the D6. In terms of upper mids, I find the D6 to be more forward and there is extra definition and crisp. There is a good bite coupled with intimacy of female vocals. Next, the treble on both has similar air and D6 being the more energetic one, has a good sparkle. Treble articulation on the D6 is more precise. Details retrieval on both is very similar. In terms of soundstage, I find both of them to have an equal width and the D6 has an added depth for a more open feel. Positioning of instruments and vocals are better on the D6. Resolution of both is very similar but D6 has the edge due to its speedy decay.

    Alpha & Delta D6 vs Mee Audio Pinnacle P2

    The P2 has more sub-bass quantity than the D6 and extension on both is very similar. The P2 has a rumble that is as quick as the D6. Bass decay on both is similar. I find the bass articulation on the D6 to be more precise. The mid-bass quantity on the D6 is slightly more with more slam. Overall dynamics increase for a more engaging listen. Transition from the lows to the lower mids are quite smooth on both. Lower mids on the D6 has similar body as the Pinnacle P2. Male vocals are being expressed without sounding hollow. The upper mids on the P2 is more forward and there is a slight crisp to it. In the treble department, D6 has more air rendered with sparkle. There is more bite on the D6. Presentation on both is clean with a good level of details retrieval. The D6 has more stage width and depth. The positioning of instruments and vocals is more accurate on the D6. Resolution on the D6 is more refined.

    Alpha & Delta D6 vs Kinera H3

    The H3 has more sub-bass quantity but it lacks the extension D6 has. The bass impact on both is present with the D6 stretching more deeply. Bass decay of H3 is slightly faster with a quick rumble. The bass note on the D6 does not hit very hard but it is being articulated with authority and control. The bass texture on the D6 is slightly smoother. For mid-bass, the D6 has more slam for increased dynamics. The lower mids on the D6 has more quantity than the H3 while the H3 upper mids is more forward. Male vocals is definitely better expressed on the D6. For female vocals, I feel the D6 has a good mastery in it while the H3 does not control it as well. In terms of treble, the D6 has a good treble body and extension. It has similar amount of air as the H3. Moving on to the soundstage, D6 has the better width while H3 has the better depth. Resolution level is very close.


    The D6 is a detailed bright sounding iem that has a good mastery at the top end. Not only does it has finesse in its treble presentation, its bass note has a very good impact which helps to raise the overall dynamics. Coupled with a 8 core cable and a spring loaded design for the jack’s strain relief, the D6 has a combination of excellent build design and engaging sound signature.


    For more reviews, visit https://audio123blog.wordpress.com/ .
  5. Cinder
    Alpha and Delta D6 Review: Built Like a Tank
    Written by Cinder
    Published Feb 16, 2018
    Pros - Best-in-class durability, transparent and detailed sound, natural and cohesive signature, excellent accessories, visually attractive design, metal housings, 8-core SPC cable
    Cons - Occasional sharpness
    Alpha and Delta D6 Review: Built Like a Tank
    Alpha and Delta is a Singapore-based company run by audiophiles. They have been designing and selling IEMs for a good amount of time now, with their bread and butter being durability. They’ve consistently released IEMs that outlast their competitors. This year they have decided to up the ante and release a premium IEM that doesn’t compromise on their values of durability, the D6.

    You can find the D6 for sale here, on Alpha and Delta’s official website, for $95.

    Disclaimer: This unit was provided to me free of charge for review purposes. I am not affiliated with Alpha and Delta beyond this review. These words reflect my true, unaltered, opinion about the product.

    Preference and Bias: Before reading a review, it is worth mentioning that there is no way for a reviewer to objectively pass judgment on the enjoyability of a product: such a thing is inherently subjective. Therefore, I find it necessary for you to read and understand what I take a natural liking to and how that might affect my rating of a product.

    My ideal sound signature would be an extended sub-bass with a leveled, but textured, mid-bass. The mids should be slightly less pronounced than the treble, but still ahead of the bass. I prefer a more bright upper range.

    Source: The D6 was powered like so:

    HTC U11 -> USB-C adapter -> earphones


    Hidizs AP100 3.5mm out -> FiiO A5 3.5mm out -> earphones


    HiFiMAN SuperMini -> earphones


    PC optical out -> HiFiMe SPDIF 9018 Sabre DAC 3.5mm out -> earphones

    All music was served as MP3 @320Kbps or as FLAC.

    Sound Signature
    Initial Impressions:

    It’s bright. In fact, it’s the first IEM I have reviewed in a long time that prioritizes the treble this much. It can effectively be considered a reverse-L-shaped IEM as the treble comes out in front, followed by the mids which are almost evenly matched with the bass.

    Treble: Songs used: In One Ear, Midnight City, Outlands, Some Might Say, Satisfy

    An IEM such as the D6 often struggles to find the best balance between enhanced clarity and not becoming sharp and overly hot. Alpha and Delta are clearly aware of this and took certain steps to mitigate any potential sharpness that could arise from a tuning as aggressive as the reverse-L. They did an admirable job in my books: nearly every single song I listened to had a well-extended, incredibly airy presentation. I’d wager that the treble curve on this is quite similar to that of the Accutone Pisces BA, a personal favorite of mine.

    Most of the D6’s treble performance is predicated on how well the song you are listening to is mastered. Does it have lots of compression? Is it participating in the Loudness Wars? If so, the D6 will respond quite poorly. But should it be mastered by someone with even moderate skill, there won’t be any issues.

    Cage The Elephant seems to have used producers with adequate skill since the treble of In One Ear was clean, airy, and quick. Each individual hit of the cymbals and high-hats was clear and fully articulated. Same goes for Midnight City. The synths melded together well and remained clear throughout the entirety of the song.

    Treble detail retrieval is pretty damn good and is competitive with IEMs that have BA drivers in them. I am thoroughly impressed with just how clear the tiny parts of each song come through. For example, the background of Some Might Say is filled with subtle percussion instrumentation, much of which gets melted together on lesser IEMs. The D6 delivers a clean articulation these sounds.

    That said, there were occasions where I needed to turn the volume down on the D6 to avoid discomfort due to sharpness. Satisfy was definitely sibilant and hard to listen to. I’d imagine that this hotness comes from some misbehavior in the 4KHz–6KHz range.

    Mids: Songs used: Flagpole Sitta, Jacked Up, I Am The Highway, Dreams

    The D6’s mids are pretty even and have a slight rise towards the upper mids, likely to blend it with the treble. While they don’t quite have the edge of clarity that the treble has, they win terms of timbre. The D6 is almost completely transparent. It gets out of the way in a similar manner to the Earnine EN120, an IEM with the best transparency I’ve ever heard in the mids.

    I am a particular fan of the tonality the D6 gives electric guitars. The crunch on the lead guitar of Flagpole Sitta is satisfying. This property translates nicely to I Am The Highway, which benefits similarly.

    Speaking of which, the vocals of I Am The Highway were a pleasure to listen to. Their weight was a little light for me, but they were nimble and very clear nonetheless. Female vocals definitely take the lead here, if by only a small amount.

    Bass: Songs used: Moth, Gold Dust, In For The Kill (Skream Remix), War Pigs (Celldweller Remix)

    The D6’s bass is clearly tuned to suite songs like Moth over those like Gold Dust. Bass tonality is fairly linear, but there is still a small mid-bass hump. It isn’t too emphasized and lies in-line with the mids for the most part. This tuning defies the traditional consumer V-shape making for a more detail-oriented take on the lower-mids and bass. It definitely does pay off: bass guitars (which are usually mixed pretty far into the background) maintain their solidity and tonality consistently and do not get blurred out or pushed beyond audibility.

    So then are electronic songs a lost cause? Not exactly. If the songs you are trying to listen to are mastered well you will still get a reasonably aggressive bass line: I could definitely make out some mild rumble in Gold Dust, though it is certainly nowhere where it would need to be to be considered a basshead IEM. War Pigs fared similarly, though it did feel a bit shallow without the big impact bassier IEMs tend to afford it.

    Bass extension is pretty good too, with the D6 managing to push fairly low and keep up fairly well with the bass line of In For The Kill. While it did tend to lose some solidity at the lowest frequencies in the song, it never felt messy or overblown. The lower-mids retained their independence and were never smothered.

    Packaging / Unboxing
    The D6’s packaging is minimalist but effective. While it could use a visual overhaul (replacing the plastic front face with some thick cardboard), I think that it doesn’t look too bad. It just doesn’t have that premium feel that it should.

    Construction Quality

    The D6 uses a “bullet” shell style. It makes use of a metal alloy for the driver housings. They’re coated in a gun-metal finish. It is surprisingly light. Based on that and the hardness of the housing I think that Alpha and Delta used a zinc-based alloy.

    The nozzle is appropriately long and has a well-shaped lip. In the mouth of the nozzle rests a metal mesh that does a good job keeping out debris.

    The cable is an 8-core SPC cable. 8-cores means that there is a certain level of redundancy within the cable that allows some of the cores to break while still allowing it to transmit the audio signal correctly. Having more cores also means that the cable can better resist pull-and-push forces.

    The D6 has great stress relief. It is touted as designed to last, and I can definitely see that in the design of the shells. The stress relievers are functionally similar to the ones used by the AAW Q, despite their vastly different appearances. This lends me a lot of confidence in the D6’s lifespan. After all, it would be a darn shame for something of this price to break because of a bad cable.

    The stress relief on the Y-splitter is also quite good. Between the outer plastic layer and the cable itself lies some shrink-wrap plastic. This plastic helps even out the force being applied to the cable by the stress relief; a very important component of durable braided cables.

    The D6’s cable is terminated via a TRS 3.5mm jack. It had an additional level of stress relief as it makes use of a spring. Given that the 3.5mm jack is usually the first place that the cable beings to break, this choice was wise.

    Overall, I give the D6 a near perfect score in terms of durability. There are no apparent compromises of flaws in design. The plastic is all well finished with, the metal is hard and secure, and the cable is tough. No complaints anywhere.


    The D6 has some reasonably wide shells, but they don’t impact my comfort at all. That being said, those with smaller ears may have a hard time getting the D6 to seal without using foam ear tips.

    I had no comfort issues while listening to the D6 for multiple hours, nor did I have any problems with it while being active with it. While I do not recommend using an IEM like this at the gym, it can be done with relative safety.

    Alpha and Delta stocked the D6 well with accessories. Inside the box you will find:

    • 1x leather carrying case
    • 1x pair of removable earguides
    • 3x pairs of solid-core eartips
    • 3x pairs of smooth-core eartips
    • 2x extra pairs of standard silicone eartips
    • 1x pair of foam eartips
    • 1x leather cable clip
    I really like the accessories that A&D chose to include. None of them feel cheap at all, and each one looks like it was carefully chosen to work well with the D6. I am especially a fan of the leather carrying case and cable clip. They are pretty well made are unique among the IEMs I’ve tested.

    The Alpha and Delta D6 features attractive design, extremely durable construction, and a detail-oriented sound signature. The D6’s build makes no compromises, and it definitely shows. If Alpha and Delta can revise it such that it eliminates the hotness in the treble, they’ll have a huge winner. So if you’re looking for an IEM that has boosted treble, premium looks, and very high durability, but don’t mind the occasional sharpness, the D6 should definitely be on your radar. Thanks For Reading!
      H T T and PlantsmanTX like this.
    1. H T T
      Nice review, but my experience is slightly different than yours. I don't hear the sharpness you mention, but I might have a hearing dip at that frequency. I find the D6 to have amazing soundstage which differs from your review.

      I love my D6. It is my favorite IEM for classical and acoustic music.
      H T T, Feb 20, 2018
  6. crabdog
    I can see (hear) clearly now
    Written by crabdog
    Published Nov 25, 2017
    Pros - Clarity and resolution
    Comfortable and well constructed
    Included accessories
    Cons - Non-detachable cable

    Lend Me UR ears is a Singapore based retailer of personal audio equipment. The store was opened in December 2011 with a goal to “bring quality audio products to the masses and providing good customer service in the process”. They offer free international shipping and international warranty for all items purchased. LMUE also develops their own earphone brand "Alpha & Delta".

    A little over a year ago in September 2016 I reviewed the Alpha & Delta D2 (review here). My wife has been using it as her daily driver ever since and it's still in perfect condition - testament to its durability and build quality. Lend Me UR ears has long been developing a new line of IEMs and one of them, the Alpha & Delta D6 is finally ready for the people. The D6 has a clear, resolving and balanced sound that's not often found it its price range. The D6 boasts some impressive features including a Dual Air Chamber acoustic design, licensed HDSS high definition technology and Hi-res audio certified drivers. But how does that relate to the end user experience? Let's see if we can find out.


    This sample was provided for the purpose of an honest review. I'm not affiliated with the company and all observations and opinions here are my own, based on my experience with the product.

    The Alpha & Delta D6 is available from the Lend Me UR ears store: http://www.lendmeurears.com/alpha-delta-d6/ (price in Singapore dollars).

    To buy in US dollars you can go to the official Alpha & Delta webstore here: https://www.alphandelta.com/product-page/d6

    • Driver unit: 10mm dynamic driver
    • Impedance: 16 ohm
    • Rated power: 1mW
    • Frequency Response: 10 Hz- 40 Khz
    • Speaker Sensitivity: 105 +/- db/ mW
    • Cord Length: 1.2m silver plated copper cable (each core contains 22X 0.05 silver plated copper wires)
    • Plug: 3.5 mm
    Package and accessories
    *Note this is a pre-production model so there was no packaging included. Here is a look at the accessories that will be included with the retail version:
    • 1 pair of ear guides
    • 1 shirt clip
    • 1 pair of foam tips
    • 9 pairs of silcone ear tips
    • 1 leather case
    • 1 leather cable wrap

    Build, comfort and isolation
    The D6 sports metal housings in a polished, gunmetal gray color. They are of the common cylindrical shape type that is popular in IEMs with a couple of rings toward the back that serve to give the shells a more interesting appearance rather than having a plain and straight surface. On the rear of the shells is the Alpha & Delta branding and HDSS lettering. I would have liked to see the rear edge a little more rounded as it can sometimes press against the antihelix and cause hotspots. On the top of the shells towards the rear is a very pinhole sized vent/bass port and there's another at the base of the nozzle. The nozzles are of average length and width, making tip rolling easy and there's a distinct lip to hold the eartips securely. The D6 are very lightweight and look to be very durable and well built.


    Onto the cable now and easily the nicest cable I've seen on a sub $100 IEM. The white, 8 core, silver-plated copper cable is deliciously thick from the plug to the Y-split. It feels fantastic and sturdy in the hand yet is really soft and supple, so it sits well and there's no bounciness to it. There's a metal Y-split made from the same metal as the housings and the same gunmetal gray color. The strain reliefs from top to bottom are fantastic. There's a small bump on the left side where it attaches to the housings to denote the Left side. The cable terminates in an L-shaped plug, again using the same metal as the housings. There's also a substantial spring style strain relief here, similar to what you find on some Trinity Audio IEMs. It works extremely well but I feel it could have been made half as long and still be just as effective. The only downside to this cable in my opinion is that it is non-detachable but it really feels built to last and as is absolutely gorgeous.

    DSC_0344.jpg DSC_0274.jpg DSC_0276.jpg

    Comfort is good, as is the norm for this shape in an IEM and the light weight of the shells doesn't cause any burden on the ears. I found noise isolation to be about average and suitable for most situations.

    About HDSS high definition Sound Technology

    Real-time crystal clear sound without distortion

    Speakers create sound through vibration. Due to the small enclosure, the reflected sound waves can distort our music by interfering with the sound waves entering our ears. HDSS technology removes these reflected waves to ensure crystal clear sound.

    Detailed 3 dimensional sound reproduction

    The removal of reflected waves also allows speakers to disperse sound coherently, allowing for a naturally projected sound stage.

    About Dual Chamber Accoustic Design

    The dual chamber accoustic design redirects reflected sound waves into a uniquely designed second chamber which absorbs these sound waves. This reduces distortion and improves the clarity and soundstage of the earphones.

    Built like a tank- 3 years warranty

    The weakness of any pair of earphones lies in its wires. Majority of the earphones uses 4 core cable. Once breakage occurs in one of the cables, the earphones cease to function. Many earphones also do not come with sufficient strain reliefs to reinforce vulnerable areas such as the 3.5mm jack.

    In response, the D6 reinforces the 3.5mm jack with a spring loaded design. Furthermore, D6 uses an 8 core silver plated copper cable to ensure extra durability. Thus, even if wire breaks, the remaining cores will ensure the continued functionality of the earphones.

    This is a very different beast from the A&D D2. It's more balanced and resolving across the board. The bass has more texture and definition, vocals and midrange are clearer and treble has more presence and extension. There isn't any single area where the D6 shines, it's more of a goodness across the board type of IEM. Sound is balanced and leaning slightly towards bright.

    While the D6's sub-bass has great extension it doesn't carry a lot of weight, keeping in line with its balanced approach. When it comes to mid-bass the D6 has lovely texture and definition but is consistent with the sub-bass in its mature levels. There's enough punch there to drive music and a natural, fairly fast decay that brings realism and at the same time great control. This is not an IEM for the bassheads out there but for those looking for a more even tonal presentation..

    Midrange is very tidy, its instrument separation impressive and level of clarity above average. Vocals are sweet, particularly for female vocals that get a little boost and are a real treat. Male vocals also get some love with a little weight carried over from the upper bass to give them enough richness to avoid sounding thin, yet at the same time don't sound colored. Lovers of classical music should appreciate the timbre and clarity of the D6's midrange with its slight upper midrange boost - Beethoven's String Quartets by the Emerson String Quartet sounds fantastic with these. Don't think these are limited to the classics though - "Down" by Run the Jewels sounds energetic with the vocals still managing to pop despite the tracks heavy bass.

    Treble is nothing short of excellent on the Alpha & Delta D6 for something in its price range. The extension is fantastic, providing plenty of air and detail. It's nimble and energetic but never strident or piercing. The sheen of cymbals and bells is really nice, the way they ring before fading into the distance. There's enough sharpness to grab your attention but it eases up before it becomes uncomfortable and its far reaching nature adds greatly to the dynamic range. It's clean, it's nimble and it pops.

    Soundstage here is very clean with a fair amount of width and depth. There's plenty of space between instruments which are positioned accurately enough to let you know just where they're situated. Stereo separation is another strong point and imaging is above average, the overall impression is one of clarity and detail.



    TFZ Series 4 ($99 USD)

    The most notable difference here is the bass, with the series 4 having a much more pronounced mid-bass. It's a really punchy and impactful bass which actually sounds a bit over the top after listening to the D6 for several consecutive days. The jump between the bass and midrange is more noticeable on the Series 4 - that meaty bass doesn't carry over into the lower mids, making them sound a little thin. The TFZ's thinner, boosted upper midrange gives less distinction between upper mids and treble making the top end sound less separated and lacking the separation of the D6. While the Series 4 sounds more typically V-shaped the D6's rise from low to high is more linear without the associated peaks found in the Series 4. The D6 has a more defined soundstage with superior imaging.

    Toneking 9 Tail ($125 USD)

    The TNT has more bass presence but it lacks the texture and definition of the D6. Both these IEMs are fairly balanced but where the TNT puts more emphasis on bass the D6 instead boosts the upper midrange. While the D6 has a bright personality the TNT is a smoother and more relaxed listen. Both of these IEMs have good detail retrieval but the D6 has more clarity in the midrange that gives it an edge in instrument separation. Treble on both is light and airy, the TNT being a little smoother in this area and soundstage is equally impressive on both with the D6 having a slight advantage in imaging.


    The Alpha & Delta D6 was certainly not what I was expecting after my experience with the D2. The D6 has a much more refined and mature tuning and is definitely a big step up in terms of technical performance.

    With its mature tuning the D6 is a more serious offering from A&D that aims more towards transparency and resolution compared to the D2's fun and relaxed approach. The D6 impresses not only with its clarity and detail but also with soundstage and imaging. Anyone looking for something more balanced and less V-shaped than the typical offerings in the $100 range should take a look at the Alpha & Delta D6. It offers a solid build and great sound and comes with a very impressive 3-year warranty.


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