I was in Guitar Center today. I brought my 400+ in with me, I wanted to try out some basses. My eventual favorite was a Musicman Sterling. Great sounding bass. Anyway, I had the 400+ running into an SWR Goliath III, because thats what I have. It sounded great. But just for the hell of it, I plugged the bass into an SVT CL going into an PR410HLF. It sounded unbelievable. As good as it was through my amp, this was definitely better. The low end was just as powerful, but tighter, and more defined. I tried EQing my amp, but I couldn't get the sound to be as good as through the SVT. I ran my amp into a different PR410HLF, and that was better, but still not quite as good as the Ampeg. The tubes in my amp are only a few months old. Is this typical of these amps? If so, I think i'm gonna sell my Mesa, and get an SVT CL, I loved that sound. Thanks.