I have an Ampeg B4 going mono bridged (1100 watts)into an Ampeg SVT 4-10 SVT HLN cab (4 ohm). The cab is rated 500 watts continuous and 1000 watts peak. The problem is I have to set my Gain at 3:00 o'clock and my Main Volume at max to get the volume I need to be heard in my band in a small rehearsal space. I have two guitarist. One is playing a Marshall stack with a JCM 900 head and the other is playing a Marshall 2x12 50 watt combo. The drummer hits hard. I know that is a lot of sound, but I should not have to peg my amp to be heard in such a small space. Also, I stand and face my cab from across the room. My question is. What can cause a loss of power on Solid State amps such as a B4?