Ok. I have a SWR WP 700 paired with a Fender Rumble 410 cabinet. I have been incredibly pleased with the tone. However, I'm not getting the volume that I think should be coming from the combo. The Fender is 4 ohms and is rated at 500 continous watts (1000 watts program). The SWR is 700 watts @ 4 ohms, 450 @ 8 ohms. Is it just the cabinet or do I need to do something in particular with the amp to get optimal volume?