Originally Posted by BatToys
you don't believe me?
I didn't say I don't believe you, it just strange for someone who works in the audio store and can test the equipment before buying it - you "bought it" to discover later that it's bad. Unfortunately, here in US it's impossible to test drive any of the Asian audio gems (headphones or equipment) and we solely rely on impressions of others.
Like I said, we all entitled to our own opinion. I would expect a lot of opposite opinions when it comes to headphones since we all have a different personal taste and sound perception, but with DAP is usually cut'n'clear. AP100 might not have a perfect sound and I don't have a reference to compare it to DX90 or AK240, but it's by far NOT crappy!!! In 24b/192k setting (unless you have a defective unit where SRC feature is not functioning correctly) - the sound shines and has an edge over X5, HM700, and Note 2 with either E18 or A200p.
The only explanation I have if you tested it with headphones that have in-line remote control and thus TRRS 3.5mm connector. AP100 can only accept a regular TRS (tip-ring-sleeve) version, and if you plug in headphones with in-line remote/mic (those have tip-ring-ring-sleeve on the connector) - it will sound like crap :) So, please verify that. It could be a source of your problem.