I have been under powering my LS50 for a while till I decided to try them with my Quad 909 , 140 watt per channel amp with my peak volcano as a pre amp and wow the difference is from here to the moon.
I was using a low wattage integrated tube amp I think 15 watts per channel and they sounded beautiful but lacked dynamics, punch and a little detail.
I have the whole quad system driving my old spendor sp1 which are just Jewels. I am planning on returning my quad amp to my main system and getting either an emotiva , a parasound or maybe another quad if I find a good deal.
I plan to keep this speakers forever , they r just amazing!
These little suckers really sing when given some juice, I've got mine hooked up to 220 watts of Peachtree Audio's finest and boy do they sound great, especially for the pice!