I've been using my Markbass Tube 800 and it sounds fine, but I was reading on the Thunderfunk website a reference to your sound being "ump" "ump" "ump" instead of "thump" "thump" "thump". So for the heck of it I got my 4U SKB case out of the basement that has a Line 6 Bass PODxt Pro and a Carvin DCM1000. Bridged into 4 ohms - 1000 watts up against the Markbass' 800 watts. Plugged into the Acme Low B2 and Dr Bass 15" POD/DCM1000 and it sounds wonderful. Much fuller and thicker than the Markbass. A lot heavier, but maybe Mr Johnson was correct when extolling the virtues of the lead sled. I wasn't even playing at high volumes, so the 200 watt difference didn't come into play. I think I'm going to play this for awhile. It's heavy, but not as heavy as an SVT. Then again, maybe it's just a stepping stone to an SVT.