I recieved the Dual SVS Ultra/ Samsung S-1000 amplifier. My system prior to that was as follows: Definitive Tech BP2000TLs for Front LR Definitive Tech CLR3000 for Center Definitive Tech BP2004TLs for Surrounds Outlaw 950 Preamp 5 Marantz MA700 200watt monoblocks I had a Velodyne FSR-15 for the LFE only. This was a wonderfull combination. From reading about SVS on this sight I decided to try them out. The Velodyne sounded fantastic but it did not rattle your teeth like I wanted. I sold the Velodyne. The SVS system blended in perfectly with what I already had. It put out much more sound pressure, but I still felt like I was missing some LFE detail and depth. So, I took two of the MA700s and put them on the SVSs. I took the Samsung and put it on the BP2004s. Recalibrated everything and OH MY GOD what a difference. The detail, depth and power is unbelievable. If you want the most out of your SVS subs I highly recommend putting a highquality HIFI amp on them. I am so excited about how they sound now. Thanks for letting me share my experiences, this is a wonderfull sight.