I have an Ampeg PR-410HLF 4x10 cab. I bought a Crown XLS-1000 to drive it. When I set the amp to bridge bypass mode it does not increase in volume at all. When I set it back to stereo nothing changes as far as volume goes. I have my guitar going to my sansamp BDDI xlr -> chanel 1 xlr in through the amp -> speakon to the cab. Again, I don't hear any difference between bridged and stereo mode. I have to turn the volume all the way to max to get any loudness and that is not all that great. Any advice?