Just a little correction to my previous message. My REL connected to the RB1092 amp.
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The problem is the way most digital amps ground do not mesh with the way the high level cable from REL grounds. This is why you are getting a grounding hum through the sub when connected. Rel has not had a fix for this issue until recently. You can now order from Sumiko or your authorized dealer, a new high level "digital" cable that has the two "hot" wires for your amp(red/yellow) and instead of the black ground wire, there is an rca plug that you connect into any open rca on the back of your pre-amp. Once this cable is used, you should not have your hum anymore or the amp shut down. Just hook up your LFE for now until you get the new cable.