Reposted from forum:
BAM200 is tailored for bass guitar. With all controls at 12 o'clock it has a pronounced mid-range dip with boosted low and high end. To get something close to a flat response you need to set with Bass at 10 o'clock, Mid at 3:30 and High at 10 o'clock. That provides a response that's flat to +- 1db from 30 Hz. to 10 KHz. Also note that the BAM 200 has a lot more gain than a dedicated power amp. Set the Kemper monitor out at around -30 db and run BAM200 gain at around 10 o'clock. Set BAM volume to suit.
Okay, so it made a night and day difference with those settings. It sounds better, but it definitely colors the sound. I feel like I might return it and go with the Icepower module. I'd just need to wait for the enclosure, which could take 45 or more days to arrive, which is a significant part of the reason I went for the BAM in the first place. Also, thank you for posting that, and everyone for the suggestions.