staffordjon05, Your manual states you can run a 1/4" cable from the preamp out on the back of your B2-re into a power amp. The thing is, you have 450 watts with a 4 ohm load, right now. That should be loud enough, already. If you're not getting enough out of the amp, the first thing I would do is start cutting the lows a bit. The 810 you're using isn't really a low end monster. You might be pushing lows from your amp that your cab isn't able to give you. Try putting 40Hz at 0 on your graphic EQ, maybe and see if that helps.