I have B&O fitted to the cab and it sounds great, no distortion or over bass etc throughout the volume range and even when cranked to max it does not distort at all.
However, im looking for a way to increase the volume so its louder but still retain the clarity that i already have. Just those few extra dB across the volume range would be beneficial.
If you've got your green menu enabled you can raise the input gains for the different media types, which will give you a little boost. Just don't go too far, it can get a bit fuzzy maxed out.
You can also press 'setup' while you're on 'media' for another extra volume dial I recently discovered.