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How do these compare to Rezeros?
This is my opinion based on A/Bing from an iPhone 5 w/o amp and Clip+ w/o amp using lossless files. The 262s got plenty loud for me, but they do drain the battery faster. I'm planning on just charging the iPhone/Clip+ more often vs carrying an amp around. I also listened to them amped with a Fiio E6 (flat EQ) and did not notice any change in frequency response or 'better' sound necesarily. I would only recommend amping if you a) want to utilize bass boost or b) your source isn't loud enough or c) you want to intentionally color the sound with an amp or d) have money to spend on a quality amp
Treble: Similar extension, not as much output - there's a relatively steep dropoff after ~8k, so cymbal crashes for instance aren't as loud/forward as the ZERO.
Mid: Pure bliss. If you loved the ZERO's mids, this kicks it up to a whole another level. Upper mids tend to sound more forward to me, because the treble is a little recessed in comparison
Bass: More quantity and extension, but definitely not basshead level. If you liked the bass on your ZEROs you will love the 262s. Sounds such as the snare drum don't quite have the sparkle that ZERO does, and fast drum rolls tend to sound a little congested/muffled (again, treble rolloff to blame here, IMO)
Soundstage: Much better than ZERO, in my opinion. Better instrument separation, more 3D (think of the centered sounds coming from in front of you rather than in your head with the ZEROs
Tips: tend to change the soundstage and response quite a bit on the 262s, so if you do get them be sure to try different tips because they sound amazing with the right fit.
Overall impression: I loved my ZEROs but was looking for a tad more bass and better soundstage, and the 262s deliver. I still love the highs of the ZEROs better though - they had good extension without sounding fatiguing. The 262s sound even more relaxed due to their mid-focused sound, but there are some tracks where I miss that sparkle of the ZEROs
I would also look into the VSonic GR07 if you are not too sensitive to edgy treble and can tolerate some sibilance. It has much better bass quantity and impact than both the 262 and ZERO, and the soundstage is pretty wide. I really liked them except for the sibilance/treble. Wearing them over the ear and odd square shape may also be a fit concern but their nozzle is adjustable so it's not that difficult to get a comfortable fit.
Hope this helps...FWIW after listening to the 262s and GR07, I probably won't listen to my ZEROs anymore. But at $60 right now they are absolutely incredible value.