I'm currently really happy with my system. But... I keep thinking of changing my power amps. Would older Quad valve amps such as Quad II's or similar be powerful enough to drive Spendor SA1's? I only listen at moderate volumes, very rarely at silly volumes levels, normally maximum of 8, sometimes 10 on my volume control (goes up to 22 with each setting from 6 onwards adding 2.5 decibels). I can get a pair of Quad II amps for about £800.00 but spending more gets better ones. I have no particular budget in mind, but do not want to spend too much more. Thinking of Quad amps as I liked the change that the Quad 44 made to my system. Caveats: sometimes use my system for movies, but never very loud. Usually Max of -20 on Denon 3801 AV amp.