Alpha & Delta D3

  1. Cinder
    An Absolute Steal!
    Written by Cinder
    Published Mar 6, 2018
    Pros - Excellent build quality, great price-to-performance ratio, good warranty, great accessories, top-notch bass response, pleasing midrange tonality
    Cons - Some dropped details, minor treble roll-off
    Alpha and Delta D3: An Absolute Steal!
    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, and this year they have decided to up the ante and release a budget IEM that outclasses many more expensive products in terms of build-quality and style. But does this aggressive bet pay off in creating a compelling purchase?

    You can find the D3 for sale here, for $30, on Alpha and Delta’s official web-store. As of writing it has been discounted to $28.

    Disclaimer: This unit was provided to me free of charge for review purposes. 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 D3 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:

    The D3 features a fairly warm sound signature. It has a notable mid-bass with a surprising level of sub-bass presence which naturally results in a recessed midrange. I’d wager that the D3 is aiming squarely at the sub-$50 basshead market.

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

    Treble is articulate and inoffensive. It handily outperforms its price-bracketed peers that share a similar sound signature and provides a natural and even timbre to the high-range of my test songs.

    The D3’s treble brings out a good amount of background details too. The high hats in the background of In One Ear were audible throughout the entire song as was the top end of the crunch of the rhythm guitar.

    The upper end of the D3 was free from sharpness or sibilance. I could listen to any and every song in my collection without any concern of discomfort. Even Satisfy was a pleasure to listen to.

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

    Midrange separation, on an absolute level, is average. As a result, the number of concurrent instruments that are clearly articulated isn’t too high. This is a product of a combination of factors: the aggressive nature of the mid-bass and the budget quality of the D3’s driver.

    That said, I found timbre and tonality to be quite good, if not a bit warm. Guitars sound great, particularly in rock-related genres, as do drums and bass guitars. The additional presence of the lower-midrange also helps fatten up some lazily mastered songs/songs that were mastered in a “neutral” style.

    Vocals are pushed forwards by 2dB–4dB lending them some much-needed separation from the rest of the instrumentation. This additional emphasis also gives the vocals a small amount more of intelligibility.

    The midrange has a health attack and decay too. There’s no clipping nor distortion from resonance.

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

    The D3’s bread-and-butter is its bass. By all meters at this price point, the D3’s bass is top-notch. It is quick and impactful, making excellent use of a mid-bass hump. The D3 also serves a quite generous helping of midbass that gives it a classic dynamic-driver rumble. Bass-heads will be unequivocally pleased by the D3’s bass response and bass signature.

    Packaging / Unboxing
    The D3’s packaging is small, simple, and economical. It is simply a cardboard box with a plastic tray inside it. Nothing fancy.

    Construction Quality

    Alpha and Delta are quickly warming up to become my favorite IEM builders. The D3 is the second product I’ve received from them that implements extremely impressive construction techniques and makes use of high-quality materials that are often times only found on products many times its price.

    The shells of the D3 are made from die-cast metal and coated with a reflective gun-metal coating. The shell is built from three individual pieces and is sealed quite well. It has no panel gaps anywhere on its build.

    The cable is similarly impressive. At this price point, you seldom find quality rubber cables, let alone a braided SPC cable! There’s also no visible compromises on the assembly either; the stress relief on the Y-splitter is built from a single piece of plastic and does a really good job dispersing force.

    The cable is terminated with a 3.5mm jack housed in plastic. It too has a good amount of stress relief, though mechanically the 45-degree angle plug is the least likely plug to survive drops and hits. That said, since this particular permutation of it is actually quite well made I’d say you won’t ever run into those issues outside of some extreme situations.


    The D3’s shells are very small, and as such, quite ergonomic. They are worn over-ear and provide a medium-depth seal. I find that they work well with my ears using the included double-flanged eartips and my seal is phenomenal. I experience no fatigue or discomfort after some very long listening sessions or while listening during a nap.

    The D3 is very well equipped for a product that’s so cheap. Inside the box you will find:

    • 1x pair of double-flanged eartips
    • 1x pair of foam eartips
    • 3x pairs of silicone eartips
    • 1x shirt clip
    • 1x leather cable wrap
    • 1x leather carrying pouch
    • 1x silicone earguide
    I am very impressed with the D3’s selection of accessories. Not only are the eartips included varied and high-quality, but they come alongside the same leather case and cable-wrap that come with the far-more-expensive D6.

    The D3 is an absolute steal. For such a tiny amount of money, you get a bass cannon that still articulates itself decently, a rarity in even the audiophile market. The D3’s solid build quality, good warranty, great accessory package, and alluring visual design solidify it as one of my favorite budget IEMs, and certainly my favorite IEM at this price-point. If you’re a bass-head with an extra $30 to drop, I heavily recommend you check out the D3. It’s a winner all around.
    1. H T T
      I have been more than impressed with the D6. The D3 sure seems to be a steal. I should have picked one up when Alpha and Delta had their Chinese New Year sale.
      H T T, Mar 8, 2018
      Cinder likes this.
    2. Cinder
      The D3 is the Yang to the D6's Ying.
      Cinder, Mar 8, 2018
      H T T likes this.
  2. audio123
    Alpha & Delta D3 - Warm & Smooth
    Written by audio123
    Published Feb 28, 2018
    Pros - Warmth, Laid-Back, Build Quality
    Cons - Lack of Crisp

    Alpha & Delta is a Singapore brand that features a lineup consisting of AD01, D2, D6 and JAAP that targets different users. Their latest addition is the D3. I would like to thank Lend Me Ur Ears for this opportunity to review their latest iem, Alpha & Delta D3. At the moment, you can purchase the D3 from .


    • Driver Configuration: 6mm micro dynamic driver
    • Impedance: 16 ohm
    • Rated Power: 1mW
    • Frequency Response: 10 Hz – 20 kHz
    • Sensitivity: 92dB/mW
    Unboxing & Accessories

    The D3 comes in a grey package that sports the brand logo, model name, description and image of the iem. There are specifications at the back of the package. After opening the package, there are instruction manual, ear guides, shirt clip, pack of tips and a leather carrying pouch which contains the D3 iem with a leather cable wrap.



    IEM Build & Design

    The D3 is small in size and its shell is gun-metal in colour. On each side of the iem, there is the brand logo printed at the back. The nozzle is slightly angled with metal mesh for earwax prevention. It has an ergonomic design and I am able to fit it in my ears comfortably. In addition, it has no detachable cable. The D3 has a nice construction with good build quality.




    Cable Build & Design

    The cable is 4 core braided and there is strain relief on each side. On the strain relief, there is a L & R marking on the left and right side respectively. There is no memory wire area. The chin slider and y-splitter are black in colour. There is strain relief. Lastly, the jack is 3.5mm 45 degrees angled gold plated. The housing is black in colour and there is strain relief.


    Sound Analysis


    The D3 has moderate sub-bass quantity and it is extended decently. The sub-bass reproduction is not very authoritative but instead, it operates in a smooth and unoffensive manner. The rumble and bass decay are modest. Each bass note is articulated with moderate precision. There is a weighted mid-bass slam to provide impact to the overall sound. The bass definition is moderate.


    The midrange on the D3 is conservative. There is a moderate quantity to the midrange. There is a decent transparency to it and at times, it may sound slightly congested when tackling busier tracks. The lower mids has a nice amount to it and male vocals are presented well. The upper mids is not very forward and it limits the expression of female vocals. There is a lack of crisp. Resolution on the D3 is moderate and the midrange takes on a less exciting manner.


    The treble is extended decently with a good control. It showcases a moderate level of finesse and there is no sibilance and harshness. The treble is presented smoothly. The level of details retrieval is good. The amount of air rendered is decent and congestion can occur at times.


    The D3 has a decent width in its stage and the depth is slightly closed in. The overall expansion is rather natural. Positioning of instruments and vocals is fairly accurate.



    Alpha & Delta D3 vs Earnine EN120

    The D3 has more sub-bass quantity than the EN120 with a greater extension. It is able to stretch further. The sub-bass reproduction on the D3 has a higher engagement level. The D3 has similar speed as the EN120. Rumble and bass decay operate on the same standard. The mid-bass slam on the D3 has a more weighted feel than the EN120 which helps to deliver a greater impact. Bass texture on both is moderately smooth. The lower mids on the D3 has slightly more quantity than the EN120 and male vocals do not sound dry. The upper mids on the EN120 has more forwardness than the D3 which benefits female vocals. Next, for the treble section, both have similar extension and operates in a smooth manner. Treble is slightly brighter on the EN120. The articulation on the D3 is more precise. Details retrieval on both is moderate. The amount of air rendered on the both is very similar. In terms of soundstage, the D3 has a wider magnitude while the EN120 has an added depth.

    Alpha & Delta D3 vs TFZ Series 2

    The D3 has more sub-bass quantity than the Series 2 but the Series 2 is able to extend better. The rumble on the Series 2 is slightly quicker. Bass decay on the Series 2 has more pace. The mid-bass quantity on the D3 has a greater amount which helps to emphasize the slam better. The D3 demonstrates a smoother bass texture. The mid-bass quantity on the D3 is slightly more and contributes to a greater slam. The lower mids on the D3 has more body than the Series 2. Male vocals are expressed well without sounding hollow. The upper mids on the Series 2 is more forward with crisp. Next, for the treble section, the Series 2 has slightly more air. D3 presents it more smoothly. In terms of soundstage, the D3 expands naturally. The width is similar and Series 2 has the better depth.

    Alpha & Delta D3 vs Alpha & Delta D2

    The D2 has more sub-bass quantity than the D3. The D3 is able to extend better with a more defined sub-bass reproduction. Each bass note on the D3 is articulated with precision. Bass decay on the D3 is quicker with more agility. The bass texture on both is similar. The mid-bass quantity on the D2 has more amount and the slam has a heavy weight. The D3 sounds musical as the mid-bass is moderately presented. The lower mids on the D3 has more quantity than the D2 while the upper mids on both is not very forward. In terms of treble, the D3 has a smoother top end and the amount of air rendered is slightly more. Lastly, in terms of soundstage, the D3 has better width and depth.


    The D3 is a balanced sounding iem with a nice tinge of warmth. It is able to display good bass texture but does not fare as well for its treble. There is a great overall smoothness and it is fatigue-free. In addition, it comes with a nice braided cable and the iem is constructed well. The D3 looks great and brings with it a smooth sound.


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      H T T and Moonstar like this.