My preamp is going into the shop so I tried using my backup 400RB as a preamp. First I went from the "send" jack of the effects loop to the power amp but later tried the "direct" out. The direct out seemed to have a hotter signal and it sounded really good. I also used the power amp of the GK to power one of the cabs so my Crest could run bridged into my 2x12. I used to have 900 watts (450x2), now I have 1300 (1100 + 200). It works well with my cabinets (PV 2x10 rated at 175w and Avatar 2x12 rated at 700w). Anybody else use a GK like this? Any dangers I should be aware of? Thanks.