I have been looking for that sound that I wanted from my system, tried different sources, cables,& tweak. I just couldnt get my LSi15 to give me the sound I was searching for. Just purchased a Balanced Audio Tech. BAT VK60 tube amp for the front mains. The sound is very very very close to what I have been searching for! Yes tube amp for HT & 2ch. I have never heard my 15's sound soo good. I have tried some SS amps & the sound was better than direct from my Rotel RSX 1065, but not anywhere close to the BAT. The BAT has given my a much wider, taller, & deeper with more air around each instrument & more dynamic during HT. 60 watt tube amp has no problem driving the 15's at reference 85db & still have 20+db head room. The improvement is like the system just got diled in & the cloud infront of the 15's has been lifted. This has been the best upgrade in the past 2 years.