In another thread (
https://www.head-fi.org/threads/slam-required-iems.958182/#post-16400376) I asked for suggestions on an upgrade in the $700 range for my Dunu 2002s, and
@SilverEars suggested a by-price downgrade: the Ikko OH10. I ordered a set for $199 from Amazon and have been listening to them (I used my own Auvio tips in case I want to return them, natch). Presently, I'm A/Bing them through a Fiio X7ii with the Dunus (also with Auvio tips) and thought I'd offer some impressions. All recordings used were 16/44.1 FLAC. I'm using the Dunu's stock (unbalanced) 3.5 cable, to match the DH10's stock cable.
The Dunu DN-2002 is a discontinued model from about 2016; they retailed for $379 when introduced, and I paid just under $300 for them in 2018. They use dual 10m dynamic drivers and dual Knowles BAs (Hi-Res certified, FR 10-40k Hz, Sensitivity 106db, 10-ohm resistance). This is both an unfair comparison and a strange one. For one thing, the Dunu doubles the Ikko in both driver count and original retail price. Also, the DN-2002 was one of Dunu's more balanced offerings, while the Ikko has a stridently vee-shaped sound. I upgraded to the DN-2002 from the DN-1000, which I had loved, and the OH-10 reminds me a lot of it, though it's probably better than the DN-1000 in most ways except comfort. The DN-2002 is the priciest IEM I've owned so far, though I've tried sets up to around $850 (the Dunus compared quite favorably.)
Perceived bass extension and slam are actually really good for a balanced-style IEM, but don't quite measure up to the OH10. The bass is a little quicker (like, almost BA quick in attack; I suspect this is a function of the front-to-back mounting of the dual dynamic drivers), more detailed, and more natural. Mids are more up-front than on the OH10 and as with the bass -- but by a greater margin -- more detailed and natural. It's both more accurate *and more musical. Highs are plenty detailed, and cymbals are done right, but overall, the DN-2002 favors smoothness over sparkle. The soundstage is a good deal wider, but imaging is only a bit better, to my ear.
The DN-2002 has MMCX connectors, which I prefer to the OH10's 2-pins. The Dunu features a metal inner and a polycarbon outer shell, which makes them a lot lighter than the OH10. However, that doesn't make them more comfortable to me. Though I have relatively large ears, the join between the inner and outer housings rubs against the bottom of my ear canal, while the cable housings tend to rub against the "spirals" of my ear. The rubber-sheathed cable is very prone to tangling.
Unlike the DN-2002, the OH10's cable is a braided design and includes a plastic sheath at the business end that provides a tight memory loop for your ears. Insertion is a bit trickier with the Ikko because of the memory loop, but there's really only one way for these things to go in, presuming you plugged the cable into them facing the right way. I give the edge in handling to Ikko. Because the cables had different connectors, I can't comment on either cable's effect on sound quality. For the same reason, I'm also not addressing dynamics here. The OH10's platinum-coated copper quasi-custom shells are frankly gorgeous, but they are remarkably heavy. While they are more comfortable in terms of rubbing, I think their weight might make them a bit fatiguing for long sessions.
The OH10's bass is frankly ridiculous. Extension is huge, and the physicality of its slam exceeds every IEM I've heard, even my beloved Radius DDM (and I haven't heard that IEM in close to ten years), and the Ikko probably has it beat in terms of speed and control, though perhaps not detail. The slam is so extreme that it made volume matching difficult. While the OH10 is just as sensitive as the DN-2002, albeit at 16 or 18 ohms (I've seen both reported). The DH10 should be harder to drive, but my experience was that I had to lower the volume relative to the Dunus to remain comfortable with bass-heavy music. Unfortunately, the upper bass blooms upward, veiling a midrange that was already underrepresented by the vee-shaped tuning. It's not terrible, but both male and female voices are less detailed and true than on the Dunus. Despite the Ikko's bass bloom, notes are fuller/rounder on the Dunu in the mids and treble. The treble is less smooth than the DN-2002 and can make cymbals sound a tiny bit hot, but overall it's pretty controlled. The extra brightness does provide a nice shimmer for strummed high guitar strings, but while it's fun, it's not quite accurate.
The OH10 can't measure up to the technical abilities and timbre of the more expensive DN-2002, but it's a surprisingly great headphone. The bass sound is really engaging, even addictive, and the treble is sparkly without being too sibilant. Its soundstage and imaging are at least average, and its construction is faultless. TheOH10 is also just plain beautiful, and it oozes quality in a way the Dunu's plastic shell simply can't. If I had seen these in your ears a month ago, I'd have presumed they cost at least $800. It won't replace my DN-2002, but I'm considering keeping it as a change of pace (and bling). It's been a few years since my DN-1000s non-removable cable broke, but I strongly suspect the DH10 is better, while selling at the same retail price (and that's in 2021 dollars!), is a fair bit better. It's a bargain...though you can probably find a used DN-2002 for as little as $200; if I were making the choice, it would come down to my preference for new equipment weight against the Dunu's superior performance. For what it's worth, I think that perhaps three years of the DN-2002 has shifted my preference away from a vee-shaped signature; that may be affecting my judgment.
Btw, the OH10 is on sale for $159 at the Ikko website right now. That's a fantastic deal.
Track notes follow:
Galactic - "Into the Deep" - Macy Grey's voice is recognizable but sounds much, much better on the Dunu. Everything else is done rather well, if not as polished and coherent as the Dunu.
Galactic - "Dolla Diva" - Guitars are engaging, bass is fun AF. But again, everything is just that bit better on the Dunu. Maggie Koerner and David Shaw voices are recessed and lack detail.
Heartless Bastards - "Only For You" - Surprisingly, the OH10 fares reasonably well on this track, with its more relaxed bass line. The lower signal seems to let the OH10 offer a bit more bass texture. Erika Wennestrom's throaty voice is handled a bit better here than in the tracks above, but again lags well behind the Dunu. The DH10 does a good job of providing space around instruments and between notes, though the Dunu does both better.
Jan's Addiction- "Three Days" - Not a terribly challenging track, but the MH10 remains a bit less accurate and musical. Nice bass, though.
Pinback -"Concrete Seconds" - WIth this less-dense, "math-ier" pop track, the MH10gives its best showing. Clear space is audible between notes and (for the most part) instruments. Transients are handled really well. The bass's impact makes the laid-back kick sound great. Guitars sound great, and Rob Crow and Armistead Smith's harmonies are captured well; they don't seem very veiled at all here. The Dunus are still a bit better, but Ikko comes fairly close, here.
Radiohead - "15 Step" - The bass slam here is just plain awesome, and definitely requires a lower volume. The Ikko moves enough air to make my tympani uncomfortable! The thumping kick drums at the track's start and bass guitar are done really well. The OH10 nearly matches the Dunu's control and detail here. The slightly recessed vocals don't matter so much for Thom Yorke; he's a bit of a mumbler at times, lol.
Radiohead - "Reckoner" - Snares, rimshots and high hats are handled really well, and the cymbals never step over the line. This song's bass line is really subdued for the first part of this song, and that seems to wipe out the vee-shape signature for that portion of the song. Once the bass guitar really kicks in the mids seem recessed again. The sense of space the DN-2002 provides is far better, and the usual pattern of its just being more capable and coherent than the OH10 continues.