I've got a pair of Sennheiser CX160 in-ear headphones, and whilst they're not the best in the range we've noticed issues on various Android phones where the music seems to sound fine, not as crystal clear as it should be, but the vocal sounds echoey and distant and hardly audible. These used to work; they're less than a year old (9 months). Stopped working completely in HTC m8, worked via 1 ear perfectly in ipod touch, and echoey in galaxy s7 and iphone. Would it be the earphones, or is it a software issue?
I've read the above posts, there are no audio effects on and no EQ setting other an normal. No SRS, wow effects, surround, concert hall or other setting.
Thanks,
Russ