I stopped by the local FRY's store yesterday to check out LSi15s. They had all the RTi series (12s, 10s and 8s) and the LSi15s set up in one demo room. I spent over an hour listening to these speakers. I am no audiophile and consider myself a novice when it comes to audio gear. I actually took the separates route almost a year ago when I bought my first Rotel amp from Jesse (thanks Jesse, it's still in great shape). Though I visit this forum almost everyday, I rarely post. But I digress....
Coming back to the point, I asked the sales guy to randomly switch between the LSi15 and the RTi12 while I listened with my eyes closed. I have to mention that it was not an optimal setup and probably was not the best way to compare as these speakers were powered by a HK receiver (and according the the sales guy is 200 w/ch). I could tell when he was switching the speakers b'cos of the change in the volume level (8 ohm vs 4 ohm?).
Even with my limited experience auditioning speakers, I was clearly able to tell the difference between the LSi15s and the RTi12s. Now I understand what you guys mean by "bright" and "forward" when describing the RTi series. The LSis are definitely more laid back and seem to reproduce music more accurately. The biggest issue I have with LSis is, I don't have them . I am now in the market looking for a used pair of LSis15s (black) :) .
FRY's has the LSi15s on sale for $1400 (they are giving you $200 off instead of the free sub) is anyone is interested.