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  1. virgilot
    Ikko OH1: Cobalt Goodness
    Written by virgilot
    Published Feb 17, 2019 at 9:50 AM
    Pros - amazing build quality
    fit is nice and easy
    relaxed sound with exceptional performance in lower frequencies
    no hisses or peaks
    Cons - no hard carrying case
    less analytical, more relaxed

    Ikko OH1: Cobalt Goodness

    Vox Sonitus Audio Reviews is not affiliated with ikko Audio in any manner. I do not receive any cash incentives, rewards, or anything from them. This review is my non-biased comprehension and appreciation of the said in ear monitor.

    The product we’ll be reading about today is from Ikko Audio Technology, a relatively new company that has started its journey with the ikko Meteor (ikko OH1). Currently, Penon sells them here at 139$. The OH1 is equipped with a Knowles BA and a single dynamic driver, and is a good entry for the midfi range of iems.

    About Ikko:

    Ikko itself comes from a large Chinese ODM (original design manufacturer), which has created solutions for many well-known brands over the years. Through shareholders with strong operational experience, ikko rose as a company during late 2018

    Their philosophy is as stated on their website:

    “IKKO aims to promote a new concept of “FREE” and high fidelity for music lovers in the context of the rapid development of contemporary digital music. As a new brand, IKKO is committed to bringing the new era of digital life design concepts into a combination of tireless innovation to bring outstanding audio-visual Experience.

    As quoted by Watson from Ikko Audio Technology, “We hope that consumers and partners can bring the best experience of [today’s era]. As mentioned on our official website, we are committed to the close combination of people and the “mobile Internet”, to bring real “free” applicable experience.”

    Ikko has, as of writing this review, only released one iem. Ikko’s promise on delivering “free” hifi stems from their deliverance of price to performance ratio, with more products coming soon that will be “quality products”, to be on par or even better than the OH1.

    Personal Preferences:

    • Packaging is important. First impressions can last a long time.
    • I do not have a specific genre that I listen to. The songs I listen to differ greatly from billboard tops to old classics, pop, rock, edm, acoustics, alternatives, metal, and all of its sub-genres. I incline listening to metal music, specifically to power metal, death metal, and the likes.
    • I enjoy variety of sound signatures, ranging from bright analytical, balanced with only a slight dip in mids, neutral warm, and neutral bright. I generally lean to neutral-bright sound signature, with a certain degree of analytical sound. I dislike over powering bass, as it is the least enjoyable, for me, in my experience listening to music.
    • I prefer iems over earbuds, earbuds over headphones.

    • Shanling M3s as DAC (PC)
    • Shanling M3s as DAP
    • Zishan Z1 + OPA1692 as DAC (PC and my phone) and dap
    • Zishan Z1 + Muses02 as DAC (PC and my phone) and dap
    • Sony NW-A45
    • iBasso DX120

    • Balanced Armature: Knowles 33518
    • Dynamic driver: 10mm polymer composite titanium-plated diaphragm dynamic driver
    • Sensitivity:106dB
    • Frequency range:20-40kHZ
    • Imdepance:18ohm
    • Cable length:1.2m
    • Connector;2-pin 0.78mm
    • Cable type:4 strands of 8 high-purity oxygen-free copper-plated 5n silver-plated cable

    • [​IMG]
    • [​IMG]
    The OH1 comes in a slick, white box that has the iem’s design printed out front. The box feels premium and well built. The product description, specifications written on different languages, and contact information are printed on the back.

    • [​IMG]
    • [​IMG]
    Upon sliding the box, the buyer is greeted with a sturdy, well-built, black box, with the ikko logo and name printed up front and their website printed at the sides.

    • [​IMG]
    • [​IMG]
    Lifting the cover, the buyer is first greeted with a thick envelope containing a few paper works regarding product information (again), how to assemble, how to wear, and warranty card. The envelope adds somewhat a novelty to the unboxing experience.

    Under the envelope is the star of the show; the beautifully designed drivers, together with two sets of silicone eartips.

    • [​IMG]
    • [​IMG]
    Under these two partitions is a velvety carrying case that contains the cable wrapped in ikko branded hook and loop fasteners.

    In total, the buyer receives the following:

    1. Ikko OH1 drivers
    2. 1.2m cable
    3. 3 sizes of balanced ear tips
    4. 3 sizes of vocal ear tips
    5. Velvet carrying pouch
    Ikko punched way above its price bracket in its packaging. The unboxing experience feels premium. They did not cut costs in materials used in packing the OH1, making sure that the iem is presented in an organized manner while maintaining its safety in thick and sturdy boxes.


    The 100$ iem price range is pretty much congested. It is truly very hard to standout because there are so many iems that are fairly good in this range. The ikko OH1, however, immediately takes its stand with its outstanding design, coupled with sturdy build quality.

    The drivers are fairly large and have this deep blue color to them that, when light hits it, turns to a lighter shade of blue. The faceplate has polygonal etchings that ikko insists to be the surface of a meteor, hence, its name. There is a clear division between the faceplate and the entire body of the drivers. The drivers have clear distinction of right and left as white markings are printed on to the metal shell. Nozzle is fairly stout with excellent grooving so that tips will stay in place. Driver mesh quality also does not look cheap.

    The cable is a detachable .78mm two pin with red and blue markings at the male 2 pin end to distinguish between right and left channels. The male 2 pins are cylindrical in shape and are very sturdy. Ear guides are present. They are pre-looped, rather than having memory wire inside them. This is much more preferable, as having memory wire can sometimes be a nuisance to take off or put around the ear.

    The cable is made up of 4 core high purity oxygen free copper silver plated material which boasts high frequency extension and low frequency strength. The braiding from the drivers towards the splitter is fine with no observable misfit.

    The splitter is aluminum and cylindrical in shape. There is no observable strain relief, nor a chin slider.

    The braiding from splitter to the 3.5mm plug is uniform. Its grayish color complements the OH1 very well.

    There is a short strain relief that leads toward the L-shaped gold plated 3.5mm TRS plug. The deep blue color is also seen here.

    Ikko did not cut costs in making the OH1. The drivers have a premium all metal build. Its stunning design is eye-catching. The deep blue and gray color scheme is very subtle and boasts confidence. The polygonal designs on the faceplate are outstanding. Although ikko did release an earlier version of OH1 that has received negative feedback about its cable having loose braiding, ikko responded with a newer version that has uniform build.

    Fit and Comfort:

    I have had a hard time trying to fit large drivers inside my ear, even though my ears are faily large. Despite the OH1 having large housings, they fit surprisingly very comfortably. The OH1 sits in the concha and the cavity between the tragus and antitragus with ease. The tail end of the iem does not bother me at all, as it fits in a perfect position.


    Isolation on the OH1 is great, though they are not the best in isolation. The vocal eartips feel much more airy and loose compared to the balanced eartips. They do block out much of the noise but I wouldn’t use a 100$ iem for commute.


    Tips of choice: I used the included vocal eartips, as these sounded more open and detailed than the balanced eartips

    Ikko stayed true to its promise of delivering extremely pleasing sound signature at an entry midfi price range. Its sound is natural, with more emphasis on the lows. Though the bass is very powerful, it does not eat away the upper frequencies. The Knowles balanced armature does a great job of presenting vocals and instruments without letting itself drown from the dynamic driver’s low end deliverance, nor sounding sibilant and sharp.

    Bass –

    This iem is a basshead’s delight. The performance of this iem in the low end is phenomenal. Sub bass is adequately strong and full bodied. Mid bass has that necessary thump to give energetic songs something to sit on. Upper bass has tone and is well textured.

    Even though the iem has much subbass and midbass, they do not sound muddy at all. The bass plays more up front than highs, but they do not affect clarity and vibrancy. Ikko tuned the low ends very well to complement the higher frequencies

    Mids –

    Vocals sound natural and smooth. There is little coloration to its presentation. There is no emphasis on either male or female vocals. Sivert Hoyem’s voice in Blown Away goes deep and does not sound colored, while Anne Bisson’s voice in Dry My Tears sound sweet, with no audible sharp peaks in “s” or “t” sounds.

    Instruments are also presented in a natural manner. There is no peak or emphasis, unlike other BA drivers that I have tested. Aja by Steely Dan plays very smooth and relaxing. The subtle palm mute can still be heard amidst the lot of instruments playing along the chorus.

    The Knowles BA does an excellent job of being able to present the mids in a natural manner with no sibilance.

    Highs –

    Highs extend very well and have great resolution to them, though they are a lot more laid back than the lows and mids. Cymbals have quick decay. Piano keys in this region sound natural. Energetic music doesn’t sound fatiguing because the highs are more relaxed.

    Clearly, the OH1 wasn’t made for analytical listening. It has easy-going highs that are less emphasized but extends very well.

    Soundstage –

    There is more width than depth to the OH1’s soundstage. Horizontal clearance is wide, while vertical clearance is a little bit shallow. Enya’s Orinoco Flowsounds excellent as there are no observable congestion, even though the song is very wide and busy with instruments and vocals overlapping each other.

    Imaging –

    In Yosi Horikawa’s Letter, every pencil stroke can be felt, as with every page being flipped. Even IV Of Spade’s CLAPCLAPCLAP shows how accurate OH1’s imaging is, with every clap being distinct from each other.


    Even though there are a lot of iems in the 100$ price point, the OH1 can stand out from the rest. This iem is excellent. It has it all; premium packaging, superior build quality, aesthetically pleasing design, amazing fit and comfort, neutrally relaxed tuning. The OH1 is a new entry level midfi that punches way above its price point.

    The ikko OH1 is definitely worth more than its price. As an underdog company, ikko did very well in the OH1’s tuning. Their concept of “free hifi” really shines on the OH1.
      B9Scrambler likes this.
  2. cqtek
    A Clear Difference
    Written by cqtek
    Published Feb 17, 2019 at 9:08 AM
    Pros - Great quality of the mid zone, of enormous richness.
    - Transparency, detail, separation and clarity.
    - Ergonomics, comfort and fit, minimum weight.
    - Deep sub-bass.
    Cons - The cables that reach the capsules appear thin and fragile.
    - Lack of greater presence in the bass, from the mid bass onwards.
    - Minimal accessories.

    The OH1 are IEMs manufactured by Ikko, a brand based in China, totally unknown and new to me. Looking for information about it I found their website:


    It shows that it is a recent brand, which has only one product, the OH1, although they say they have quite a lot of experience. My interpretation of their philosophy is that they try to integrate their products in the current digital era, through their particular conception of design, trying to maximize sound quality to offer the best musical experience.

    Ikko OH1 01_.jpg


    · Type of Drivers: 1 DD + 1 BA.
    · 1 Dynamic Driver 10mm polymer composite titanium-plated diaphragm.
    · 1 Balanced Armature Knowles 33518.
    · Frequency Response: 20-40kHz
    · Sensitivity: 106dB
    · Impedance: 18 Ω
    · Cable length: 1.2m
    · Jack connector: 3.5mm angled
    · Capsule connection type: 2 pin 0.78mm
    · Cable type: 4 strands of 8 high-purity oxygen free copper-plated 5n silver-plated
    · Weight: 6 grams per capsule

    Ikko OH1 02_.jpg


    The OH1 come in a box of dimensions 158*88*49mm. It is completely matt black, with the brand logo inscribed in the centre, in a darker, smoother and shinier black. On the back there is a white sticker with the model name and specifications in Chinese and English.

    Ikko OH1 03_.jpg

    Inside it is found:

    · A black cardboard envelope containing the user's manual and the warranty card.
    · The capsules embedded in a hard foam mould.
    · The cable, located inside a soft foam mould, under the capsules. It is wrapped up with a velcro tape, which is attached to the cable itself. The 3.5mm Jack connector is protected by a translucent plastic cover.
    · A black cardboard box with the logo on the front, inside which is a velvet simile bag, where you can find a blister with three pairs of tips translucent white silicone, whose core is blue, SML sizes. There is a small bag with two more tips, medium size and dark color.

    Although the presentation is soberly elegant, the content is the minimum required. The carrying bag is soft and offers little protection. Only 4 pairs of tips come from a single material, silicone.

    Ikko OH1 04_.jpg

    Construction and design

    As stated in the features, Ikko use an aviation grade alloy acoustic cavity, to reduce the internal harmonic resonance distortion to offer a sound more delicate and natural.

    Ikko OH1 05_.jpg

    The front shape of the capsule reminds me of the African continent, but somewhat narrower at the bottom. The surface of the capsule has dents of questionable taste. The inside, however, is completely smooth and ergonomically rounded. The capsules are not thick. The nozzles are made of the same material and have a metal filter. Their length seems longer than it really is. The diameter is 6mm.

    For the connection a transparent plastic insert is mounted to protect the two holes, both gold-plated.

    The cable has 4 fine strands, covered with rugged plastic. It is quite flexible and the memory effect is low. The connector is in L, of mixed material, plastic in the elbow, metallic next to the plug, of the same color that the capsules.

    The splitter is a metal cylinder, also of the same colour as the capsules. The connectors follow the same line, metallic and of the same colour, with a blue or red ring to distinguish the side. The two gold-plated pins are also finished in another plastic insert, very similar to those protecting the capsule connections. The cable close to the connectors is protected by a semi-rigid plastic sheath, shaped to facilitate its use on the ear.

    Ikko OH1 06_.jpg

    The cable is simply good, not microphonic or very thick. It's easy to handle. But the strands that start from the splitter to the capsules, two on each side, give a fragile appearance, because they look fine and delicate. The ear hooks are fixed, they cannot be molded. There is no ring to adjust the cable under the chin.

    In my opinion the cable, as a whole and finished, is of inferior quality than others that can be found in products of similar price.

    The capsules, in spite of the particular finish on the front, have been designed to offer the highest degree of fit, isolation and comfort. They are very light, weighing only 6 grams each, despite the fact that they are metallic. The material used gives them a strong sensation of durability, as well as their finishes and connections.

    Adjustment and ergonomics

    The fit is very good, although the size of the nozzles does not allow deep insertion, but rather superficial. Although it would have improved if they were a little thinner and longer. In this case, the search for the right tips to achieve the best fit is the key. Once the optimal fit is achieved, movement is minimal and no readjustment is required due to its ergonomic shape. As there is no movement the sound is not modified, this makes them very suitable for use in everyday life, in addition to its lightness.

    Ikko OH1 07_.jpg



    The sound is balanced, with some emphasis on the sub bass, but with more presence of the mid zone and low treble.


    The sub-bass is quite linear and compact, it has a good presence compared to the rest of the area. This particularity gives the lows a generous feeling of depth. However, the rest of the bass has no great punch and are very neutral, far from satisfying bass-heads.

    Thanks to the sub bass, the bass is not anemic at all and its texture denotes quality and naturalness. Also, the area has great control and articulation, being the speed and recovery quite good.

    The notes of the lows are tight and fine, have very good definition and detail, never meddle in the mids.

    From my point of view, declared bass lover, as a whole, the body offered is somewhat limited, as well as its global impact, compared above all with the mids. But for those who prefer balanced profiles, this area could be catalogued as very good, since, except for presence and punch, the rest are virtues.

    Actually I have something that pushes me to keep talking about the lower zone of the OH1, it's like a love-hate relationship. I have tried to describe this zone previously in an objective way, starting from my own subjectivity. Something that is really condemned to failure in itself, as well as expressing an opinion about sound. But the idea is to try to isolate the lower zone from the rest of the sound spectrum. And this is easy, and that's where I have to properly ponder the bass of the OH1s, that's where the love relationship is born: the deep sub-bass dawns, the dry blow and content of the lower middle, the precise vanishing of the upper low towards the mids... But the hatred appears when the mids pass the hand in front of it...

    Ikko OH1 08_.jpg


    Clearly this area is the most prominent of all sound. The mids are completely luminous, not brilliant. They enjoy great clarity and are placed above the bass in the presence. The cleanliness with which they are executed is remarkable and the resolution is great. The precision is equally impressive, as is the level of detail. But my feeling is that they show more natural than shamelessly analytical, because the micro detail is revealed moderately. Even so, the mids do not have that point of sweetness offered by other IEMs, but have a hint of coldness. The notes are fine but not sharp, but the origin of a very well tuned BA is noticeable. Technology and design seem to play a fundamental role in this sense, getting the best out of it. But it doesn't stop sounding like BA, a good BA, but BA after all. And this translates into what has been said, a millimetric sound that is lacking in passion and musicality. Bad? Of course not, it's another kind of pleasure or like acupuncture needles, which are inserted to heal.

    The section on high mids and wheezing deserves extra mention: extra, above all, for control. The wheezing has passed, with a note, the cotton test. And never better said, something else must have been used to keep a prominent area like this stocking at bay.

    Ikko OH1 09_.jpg


    The reason for this is the treble or the BA, more focused than extensive in very highs, but I do not blame him, I rather thank him. And the descent in the presence of this area can be appreciated above 5kHz, as if it were an aluminium staircase, with very narrow and infinite steps, precise and delicate, which are not soft but neither sharp nor metallic.

    Ikko OH1 10_.jpg

    Soundstage, separation

    Let's start with the separation: ultra, mega, hyper...? No. Let's go to the other topic: the sound is crystalline, the separation is obvious due to the thinness of the notes, the transparency is appreciated with the naked eye. But the air does not expand the scene as one might expect, it gives it depth but not so much width. Nor does it enjoy a very evident three-dimensional stage, despite the high dose of transparency. The positioning is good and detailed, but I miss something more dynamic or depth that finally widens the scene.


    Fiio FH1

    Both the Fiio FH1 and the Ikko OH1 share the same Knowles 33518 BA driver, but the difference in profile between the two is abysmal. The FH1 have a bass and dark profile, with a very evident and thick bass, The mids are recessed in relation to its low area, in addition to having quite little brightness, definition, detail and air. The difference between the mids of both are night (FH1) and day (OH1), is so great, it seems to lie that they share the same BA.

    Ikko OH1 11_.jpg

    BQEYZ KB100 (Bass mod)

    The KB100 are a triple driver (2 DD + 1 BA) of 50$, whose profile could be reminiscent of the OH1. After applying the Bass Mod to the KB100, the presence of the lower zone is shot against that of the OH1, offering greater presence and body, generating something more dynamic and fun. But again, the sub-bass of the OH1 is there to offer that differential point that the KB100 cannot counteract, at the level of depth and execution of the zone. Regardless of the level of presence of both, the lower zone of the OH1 is shown to be richer in nuances and texture, definition and control.

    However, the big difference is still in the mid zone. The voices are presented in a closer plane and stellar, in the OH1. In KB100, voices sound warmer, but do not enjoy the resolution and level of detail offered by OH1, air, definition, luminosity ... The big difference in price is clearly noticed here, the qualitative leap to sound level is based on the sub bass and quality in the execution of the low zone, in the mids in general and in the treble too, because they have better definition, a more active and precise presence, especially in the low treble, where they extend clearly more.

    But the difference is not only in the sound, but also in the comfort and ergonomics of the OH1, offering a more optimal and pleasant fit.

    As a clear plus point, KB100s are easier to move than OH1.

    Ikko OH1 12_.jpg

    Dunu DN-1000

    The classic DN-1000, triple drivers that do not need any presentation, use BA drivers also from Knowles.

    The first thing that is noticed is the difference of profile, more in V in the DN-1000, more balanced in the OH1. The sinking in the central zone of the mid to high frequencies is accused in the Dunu, offering a dark sound comparatively speaking, lacking in resolution, nuances and details. There is a feeling of musical loss in that area, something that the DN-1000 do not offer, is demonstrated with all luxury of details in the OH1. From this derives a sense of openness, greater scene and separation that is not appreciated in the Dunu.

    But if there is one thing I have to emphasize about the DN-1000, it is its low zone, sub bass included, since it offers a global power that the OH1 cannot compete, in spite of its great quality.

    Ikko OH1 17_.jpg

    Anew U1

    The Anew U1 are clear competitors of the OH1 in their price range. But really the decision to buy one or the other is not based on its quality, but on its features: If you are looking for a V-sound with powerful bass, warm and detailed mids, although somewhat distant, with some good treble presence, but under control, you would choose the U1. If on the contrary one seeks a more balanced sound, with mids with greater resolution, presence and richness, as well as greater extension in highs, would buy the OH1.

    At scene level, despite the great separation offered by the OH1, is wider in the U1, I have a feeling of greater expansion with them, perhaps due to the greater extension offered by the lower U1.

    In ergonomics and adjustment the OH1 are better, fitting in a firmer and safer way than the U1.

    As for the cable, the U1 comes with a cable that I love, at the height of the beauty of the capsules. Meanwhile, the OH1 bring a more conventional cable, where the most remarkable are the connections, apart from its great flexibility.

    In short, both IEMs could be easily complementary, having both it would be easy to use one or the other depending on the musical genre to reproduce, in order to maximize the qualities of each one.

    Ikko OH1 18_.jpg


    I've needed more brain training time with Ikko OH1 than hours of burning. After enjoying other more visceral profiles, the OH1 require a listening that demands pause and detailed analysis. Concentration to enjoy the bass, to assimilate that its quality is not in quantity or exuberance, but in its depth and other intangibles that we audiophiles appreciate, or begin to appreciate, thanks to IEMs like these. However, the mids do not require anything of that, because their virtues are instantly perceived. Just like that clearly analytical character with a great deal of transparency, detail and refinement.

    The Ikko Oh1 are a clear difference, a valuable alternative to de-numb the ears and train them for an exercise of precision and micro beauty.

    Ikko OH1 19_.jpg

    Sources used during the analysis

    · Burson Playmate
    · F.Audio S1
    · Sabaj Da3

    Ikko OH1 24_.jpg

    Purchase link


    Link to the Store


    You can read my full review in spanish here:

  3. IryxBRO
    iKKO OH1 — condemned to be popular
    Written by IryxBRO
    Published Dec 3, 2018
    Pros - good bass, good midbass, great instrument separation and soundstage, accurate tuning, fairly neutral, balanced
    Cons - some harsh notes might show up in upper midrange
    Getting back to our favorite concern — whenever there is a new player on highly competitve market of IEMs, its initial product would probably be a win due to the will and efforts in aquiring some market share and drawing the attention of the target audience. iKKO brand is not an exception. After spending several days with their first hybrid IEMs — OH1 — we can conclude that it is a great example to support our statement. In this review we would explain what makes us think this way.

    iKKO Audio Technology (SZ) Co.,LTD is located in Shenzhen, Guangdong, China. As far as we understand it has been established recently, just some time prior to releasing their first product. iKKO slogan is «Free HiFi» which really resembles price to performance ratio of OH1 IEMs. Hopefully, their following products would possess the same qualities.


    iKKO OH1 technical specifications:
    • Type: hybrid, 1x Knowles 33518 BA + 1x DD
    • Dynamic driver: 10mm polymer composite titanium-plated diaphragm, double magnetic circuit
    • Sensitivity: 106dB
    • Frequency range: 20-40kHz
    • Imdepance: 18Ω
    • Cable length: 1.2m
    • IEMs connector: 2-pin 0.78mm
    • Cable: OFC, silver-plated
    • Jack: 3.5mm, gold-plated, L-shaped
    • Weight: 12g (6g per channel)


    It is good that iKKO jumped straight into relationships with Knowles by incorporating its BA driver (also found in FiiO FH1 for example) instead of experimenting with «noname» or less professional vendors. This already adds much of the potential for the further adequate tuning especially in case if engineers from iKKO are good enough to disclose it. Moreover, OH1 uses a large diameter titanium-plated dynamic driver as a supplementary to BA in order to deliver balanced sound throughout the entire frequency range.

    Packaging and box contents:

    iKKO has chosen the common approach to packaging — strict black matt box with glossy black logo imprint at the front, company infromation at the back and white sticker describing the product inside.


    Seems that this box was developed before iKKO team even realized which product would be enclosed — this explains why OH1 technical specifications and picture are placed on a separate white sticker… Box contents are:
    • OH1 IEMs
    • cable
    • 3 pairs of white|blue silicone eartips (S|M|L) + 1 pair of black silicone eartips (M)
    • soft pouch
    • warranty card and short product description leaflet

    IEMs rest on a soft foamy podium and the cable is placed underneath in its dedicated compartment. One extra box for eartips and soft pouch.

    Design and materials:

    One of the best characteristics of OH1 IEMs is its stunning design. Aluminum top cover consists of numerous polygons, each having a specific angle and curvature, forcing the base color to change from cyan to deep blue.


    This reminds us more of a diamond cuts rather than meteorite surface which iKKO insists on. Anyway, lots of efforts from the team and CNC machine extra time to create such impression…

    IEMs base has same color and aligned precisely with the top part.


    Output nozzles are protruding from bases and covered with aluminum filter grills. There are two compensation openings: one at the top part of the base and another on the inner part, close to the output nozzle. Channel indicators are located at the top part as well and there is iKKO brand logo printed on the back edge.


    We love the style of cable connectors which are made of transparent plastic. Tight fit, no free play.

    OH1 cable seems to catch up in terms of both — the overall design and technical characteristics.


    It is OFC, silver-plated, braided, with transparent and naturally curved earguides. Features aluminum housing, 0.78mm IEM connectors with channel indicators (blue for Left and red for Right), aluminum Y-splitter, 3.5mm, L-shaped, gold-plated audio jack with a combination of aluminum + plastic housing. All joints seem to be durable but even if you’d manage to tear it apart — it is exchangeable.


    OH1 fit is nice, very comfortable to wear for a long time, no pain or discomfort, very natural feel. iKKO claims that the shape was developed using some big data collected during their prior research… We tend to believe that after spending 3 days of continuous listening and having no physical issues.

    Audio quality:

    Tested with: Hidizs AP80 (neutral sounding DAP), Hidizs AP200 (neutral sounding DAP)


    Lows and midbass:

    OH1 show very good extension and resolution of the lower range. Deep bass presence is adequate, clear, not overemphasized and definitely not distructing for other ranges. It is capable not only of creating a good sound but also sending some shivers to your nape beyond hearing ability. Bass textures are evident, disclosing additional details in this range. We would definitely give OH1 IEMs five stars for such extended and gentle approach towards lower end tuning together with its capabilities to deliver full-bodied bass, all mixed at good proportion.

    Midbass is another virtue of OH1. It has very good articulation and speed together with necessary volume and air to reproduce drum sections naturally. It tends to exhibit a bit more bright details compared to fully dynamic IEMs with similar midbass perfromance but it never reaches the extremes and not producing any piercing sounds. Seems that 10mm dynamic driver in combination with good design of shell cavities do the job of delivering midbass and lows perfectly. Engaging and powerful sound in this section.


    Mids and vocals:

    This is where BA driver steps in but in contrary to other IEMs with more neglect tuning OH1 do not suffer from excessive sharpness or overly bright tonality. Mids are neither recessed nor elevated, all instruments and vocals seem to stand in one line. Voices have a good clarity, feel natural, perceived as placed a bit to the front no matter whether belonging to male of female singer. No lisping, no thin sound effect. Resolution on voices and leading instruments is more than average but as already mentioned — not harsh or excessively sharp. BA influence on sound is obvious whilst the tuning is on the softer and gentle side. The only issue we have spotted in this section after switching from very capable pure dynamic IEMs was very rare harsh peaking sounds on female vocals… But the more we’ve listened and got used to OH1 IEMs the less impact it made. Perhaps, this was our own susceptibility to upper mids…



    Again, the choice of good BA driver and providing further adequate tuning would evetually result in pleasing performance on treble instead of just having shouting and crisp sounds common for IEMs from less responsible brands. OH1 with its airy, gentle and soft treble reminds us about Kinera IDUN featuring the same approach towards the higher end: mixing in BA driver so that it would not influence the overall tonality but would rather extend the resolution and balance the other frequencies. Kind of safe tuning that would keep IEMs fairly neutral and detailed at the same time… Therefore, OH1 treble has good extension and clarity, not overemphasized, doesn’t create a specific signature. We would say that it is even a bit recessed instead. Don’t get us wrong — it is in good proportion with other ranges — it is just a note for BA fans who love excessively bright and cool sound.


    Soundstage and instrument separation:

    We are surprised with iKKO OH1 decent instrument separation and soundstage capabilities. Tracks that would usually sound flat suddenly started to exhibit more contouring of some instruments. Moreover, we have discovered new afterglows that would shift on vertical or horizontal planes crating 3-dimentional effect. Kind of new experince… Binaural recordings show more than average distance between instruments which would result in larger depth and width of the stage.


    iKKO OH1 sound in overall:

    iKKO OH1 sound can be described as fairly neutral, balanced, with no evident coloration of the tonality, great extension of lows, good extension of treble, full-bodied midbass with natural mids. Resolution across the entire frequency range is more than average. The only sharp sounds might show up on upper mids but this would be very subjective. Soundstage and instrument separation are surprisingly good.

    Compared to Kinera IDUN:


    Kinera IDUN is another good representative of hybrid IEMs. We would say that IDUN have more resolution on treble and mids but less extention on lows and less powerful midbass. It also has a bit cooler and brighter sound in comparison to OH1. IDUN is a clear winner in terms of fit and wearing comfort due to its custom-like shape.

    By the way, Kinera IDUN Deluxe Limited is upcoming… The new version is addressing the lack of subbass and midbass extension and presence. Fingers crossed — IDUN Deluxe might show up as the best option available in this price range!

    Compared to Anew U1:


    Anew U1 IEMs are based on single dynamic driver and have slightly better extension and texturing on lows, even more engaging midbass, but less resolution and presence of treble. Completely free of any sharp sounds in mids, though. And the sound is a little bit warmer in overall. OH1 is a great competitor, balancing lower extension of bass by a better delivery of treble and enlarged soundstage.



    The fact that iKKO OH1 are direclty compared to and can compete on par or even surpass our favorite IEMs (Anew U1 is our best and Kinera IDUN is our second best) is deserving our highest concern by itself. Some pros and cons stated in those comparisons but we already understood that iKKO has done a great job and introduced new option to consider. They have placed OH1 among the most demanded products in the most popular budget. What really maters, is that in terms of sound quality iKKO OH1 really deserves such placement instead of just exhibiting similar pricing. We are highly impressed with iKKO OH1 and would definitely recommend to consider those among other neutral and balanced IEMs in this price range.

    You can purchase iKKO OH1 at PenonAudio store
    1. View previous replies...
    2. Bob Diamond
      Just got it few hours ago. First impression was awesome!! Thanks for the review boss!!
      Bob Diamond, Dec 6, 2018
      IryxBRO likes this.
    3. Adide
      Good review, I'm considering getting it.
      Can you please talk a bit about isolation in noisy environments for example while commuting (riding the train/subway/bus etc.) - in this regard that front vent looks worrisome.
      Thanks and keep it up.
      Adide, Jan 6, 2019
      IryxBRO likes this.
    4. Claus-DK
      They isolates quite good, most hybrids I have tried had weak isolation, these do not. I can not hear my wife yell at me, wonderfull...lol
      It is important to me that the isolation is good and these are good in that regard, they are very close to q-JAYS and ETYs, which in my book is pretty awesome, they isolates more than SE ref5 and they are custumfitted, throw some complys on the Ikko and they will do the job for you.
      Claus-DK, Jan 19, 2019
      IryxBRO likes this.