The preamp in the Ampeg SVT IV Pro sucks.I have heard many people complain about how disappointed they were with the volume of thier SVT IV. I thought it was loud, but it could use more volume. Tweaking with the preamp made some difference, but it would also clip the preamp very easily. So tonight, I hooked up my SVP PRO( thanks again Big Joe) in to the SVT IV. This bypasses the IV pro's preamp and uses only the SVP. WOW! What a difference this makes. The gain is at 2 o'clock,drive at 11 o'clock and the master is at about 7 o'clock. If I turn up the master to 9 o' clock, the house will shake. Has anyone else tried this before? Makes me wonder if Ampeg did this on purpose to sell more of thier products. I could not be happier with my set up now.