Hi wysin I'm a noob so immediate apologies for anything I might miss, but I did try the 375s and can provide some info on them. They are a bass heavy phone and when I say bass I mean BASS. But it's not the mid-bass that's powerful, but the sub-bass. It just rumbles and is an always present constant. Sometimes I loved this especially when listening to some funk or hip-hop, but oftentimes it just got in the way. It kept on creeping in during tracks that didn't require it, which gets to the next point and that's the mids are recessed in a weird way. Let me try to explain.
When tracks are recorded well and have a full body to them the mids sound fine. Not forward, not recessed, just right overall. But when tracks emphasize the mids and highs the mids actuall disappear and the whole track becomes oddly distant - almost like listening to an old school AM radio. I noticed this particularly when I listened to certain CCR tracks like "Bad Moon Rising" and "Down on the Corner". Again, weird.
In terms of the treble, good overall. I haven't had enough experiences with IEMs to know exactly how good, but they seem to have a pretty good extension and clarity. There was some sibilance, but not terrible. Where trebles became and issue is with harshness. Not sure if it's because they didn't roll off or were simply not controlled, but at the lower freq range of trebles they became grating often and after a short period of listening I would feel almost nauseous (and this is at lower volumes).
Fit was an issue as I couldn't get them to stay in ear with the provided tips. I don't have a ton of tips in my inventory to roll from so this was a big issue for me. Comfort was ok, but I didn't like the cables at all. They were good quality, but were not particularly pliable and had a good deal of microphonics. Usually no biggie if you can do over ear, but because of the fit issue and lack of pliability I couldn't wear them over ear.
In summary, very bassy but presents detail and clarity surprisingly well given the amount of bass presence. This is due to bass being more sub-bass than mid-bass I think. Mids are ok, but odd and trebles extend well but are somewhat harsh. I returned mine because it wasn't worth the price. At $40-50 maybe worth it, but at $100 I'd go with the RHAs personally. Way better overall package if you can get them to fit well (I couldn't sadly).
I hope this helps in some small way.
