Simply slightly different flavors of crap.:-) If you're using good quality speakers OTOH, the lower bitrate tracks will be even more obvious. Although 128 can be horrible, a lot of 192 files are decent-good.every song is different. Nowadays, a lot of hit songs aren't even mixed and mastered properly, so even the 320 versions don't sound all that good. While some songs were mixed GREAT and polished.so the 192 versions sound decent. But still, when you're in a club with a strong system, you can tell the difference much more than you can through speakers at home or regular headphones.mainly because the bass is similar.