I've got someting weird going on with my rig. I just acquired a 2nd Acme 2x10 cab. My other components are an RMX 850 and an RBI pre. I tried hooking them up with the RMX 850 in parallel, with power amp output one (speakon 4hlc) to cabinet one (speakon 4hlc); power amp output two (speakon 2hlc) to cabinet two (speakon 2hlc). Here's what I get: When I adjust the power amp channel one gain (with channel two gain off), I only get sound through cab one. With channel two gain adjustment (channel one off) I get sound through both cabs one and two. When both channel one and two's gains are at 12:00, I only get sound through cab two. Do I need a speakon 4hlc connecting channel two to cab two? If not, what is the problem? Thanks.