i just want to ask if you did an a/b with compressed v uncompressed sources regarding the bass?

the reason is that mp3 compression kills the bass. some time in the middle of the last decade, i actually bought a pair of sennheisers with a bass boost (and they were advertised and marketed this way) that was purposefully designed to counteract the mp3 compression. if you tried to use them in the studio, the bass was totally muddy and washed out. but, if you plugged some studio phones into the mp3 player, the bass sounded thin - reflecting the source.

http://www.youtube.com/watch?v=XkVZwj4pZ7A