I am in the process of having a sub built for me and I am a little miffed on what direction to go. As things stand now any sub I hook up to my system will have a hum if I turn gain up on the back of the sub to 1/2. This does not present a problem for me now because I only need to turn the gain to 20% on the bottom sub and to 30% on the top sub. I run duel Vel ct-150's presently. I plane on selling one of these and have Brian build me a AV 15. My question is if I go with the QSC RMX-850 amp will this present a problem since gain needs to be at full? I can see pro's and con's with each decision. Any knowledge or past experience my way sure would be appreciated. I gave up trying to fix the hum to. I have tried 432 different easy fix solutions.__ If I went with the SVS Black Box would it take care of any problems I might run into if I went with the QSC?