I just found this site though it's for car audio with a dc power supply it should easily convert for HT use with the appropriate adapters. Sorry Martice about this late posting (just found it) and if I remember correctly you picked up the SVS blackbox, how's it doing?
I figured out that the reason for my low output level from my amp was because I had the output signal switch on the back of BFD set to the -10db setting as opposed to the +4db. Once I changed the setting on the back of the BFD, I was then able turn down the levels on my pro amp and had plenty of headroom to spare.