I was able to buy them brand new for $70. I was intrigued by the Duoza because it uses two dynamic drivers (hence the large body sizes), while most dual-driver headphones in this price range use one dynamic driver and at least one balanced armature driver. I thought the sound should at least be interesting. Overall build quality is excellent. The kidneys themselves are bulletproof. The cable is thin, rubbery and flexible, nothing special. They look like they should last a while if cared for. - Few accessories included. Multiple ear tip sizes and a carrying case with an embroidered Zero Audio logo is all you get. I couldn't get any of the stock ear tips to seal well (securely), but I had a few extra silicone tips lying around that I used. a little sunken. - After the first listen (several hours of listening): I would still describe them as a warm U-shape, but with flattened (very) high treble. - The hiss is completely gone, but the high frequencies are bright, detailed, and retain what I call "hiss". But I repeat, no post-recording sizzling except on very sizzling tracks. The mids are detailed and very precise thanks to the dual drivers with no bass. The vocals take on a nice crisp point and have a natural warmth to them. The bass is probably the most impressive part of the sound. It has sub-bass extension (7-20Hz) that you can actually hear, mid-bass has impact and bass bleeds that aren't there. Also, it's detailed, fast, punchy and precise, VERY present but never intrusive. The soundstage is also one of the best I've heard from sub-$100 IEMs, especially the U-shaped IEMs. It's spacious but not too airy. The picture is also as good as one can expect at this price point, with instruments and sounds popping up at certain points but not separated so far that it feels disjointed. Comparison - Beats X Bluetooth - Beats has more bass, but that's about it; his bass bleeds all over the middle. The Duoza's bass is MUCH more accurate. The beats aren't terrible anywhere, but they're not good either. Their soundstage is lacking compared to Duoza. The Beats line as a whole is a mainstream bass-bloated sound designed for rap and hip-hop, and the Beats X is no different. Compare the sound signature. The Duoza has more bass and treble, but it's not really different from neutral (I know the He400i isn't exactly neutral, but it's close). high and have a very warm sound. Duoza sounds much more neutral compared to them. The 598 headphones are soft and have a pleasant sound, while the Duoza is powerful and precise. If you don't like flashy IEMs, you probably won't like these. If you like detail and lots of accurate bass, buy these. They are a great balance of fun and precision.
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