First thing that did grab me about the RS1i over the 325i, even just running off my beat-up Apple iShuffle was the depth
in bass, the RS1i definitely reaches down a little lower, sub rumbles are ample for my ears - ok, it's not an amped DT990
Premium but that can is for sub bass lovers!
T1 does rock out very nicely, it also has a peak or two past the mids that really do it for me, the articulation for guitar is
particularly well reproduced.