I have a 20-39 CS-Ultra which is being powered by a Nad THX Power amp. Although i'm satisfied with the amp (getting 400w in bridged mode) it doesn't have a gain (volume control). When setting up I have to rely on the sub level adjust on my pioneer amp to control the level which isn't ideal as it doesn't allow for a lot of adjustment up or down. Although i've had the sub set up for months now and i'm relatively satisfied the the levels, I think it might be time to consider getting another amp with gain control to replace the NAD. Does anyone have any experience with the Samson amps being sold by SVS? Or is there another amp that might suit my needs better? Thanks for your help.