Hi guys, first an answer to the question about HT/BP and XLR outs. Earlier units ONLY output HT/BP via RCA's. We later changed the design to allow HT/BP output to both. I am speaking with a dealer in Canada about this issue right now.
Regarding connecting both RCA and XLR cables into the amp at the same time (KWA 100, 100SE or 150), I would not recommend it.
The way that our amps are configured, the RCA ground is common to XLR (-) and not grounded. The +/- inputs feed a high-quality Lundahl input transformer, thus the amps circuitry is balanced, whether fed RCA or XLR inputs and there is not chance of ground loops due to floating ground.
Another important note regarding our KWA 150 when run in BRIDGED MONO mode, is that there must NEVER be any speaker load connected to the (+) or (-) binding posts that is earth grounded. In bridged mono, there is no absolute ground at the outputs and grounding either binding post to earth ground WILL damage the amp. This needs to be kept in mind when using subwoofers, etc.
Thanks,
Dan W.