Advice needed on low volume and hum out of amp.


I just purchased a demo c-j MF-5600, multichannel amp online, and after connecting it to my Denon receiver, which I am using as pre/pro. The sound I am getting is at low levels, even when I turn the volume up noticeably. I previously had my front left and right speakers connected to two small monoblocks (Marantz MA-500's), which are rated about the same as the c-j (125 wpc), and never had this problem. I also get a hum out of the speakers. I assumed this was a ground loop that I couldn't isolate, but when I put one of the monoblocks on top of the c-j and reconnected the speaker to it, leaving all the cables and everything else in place, the sound level went back up and the hum disappeared. All components are routed through a power line conditioner. I am currently trying to work this out with just the front right and left channels only. I know this is not alot to work with, but maybe someone has had similar problems. Any thoughts would be greatly appreciated.
cmp

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Thanks for the help. The cheater plug helped reduce the hum alot. I still had the other problem and heard a crackle I didn't like. My local dealer was very helpful. He let me bring in the Amp, and he agrees that htere may be a problem, so I'll have to probably contact CJ directly.