If you are using the balanced/mono setup, be sure to check your setup connections. Make sure you are using the correct input and output connections on the amp and be sure the toggle switch on the back is in the correct position. It's been a while since I owned a pair, so I went to the Monarchy website for clarification. You should be using the balance input, switch in the down position and your speakers should be connected to the two RED speaker binding post, not to one red and one black as it would be for stereo. The top left red speaker binding post is for your positive lead and the top right red binding post is for your negative lead.
Check the manual or contact Monarchy to verify the above.
Agreed with Rello that plugging both amps into a single duplex or quad outlet will tell you if you have a ground loop problem. Lastly, try lifting the A/C ground using a cheater plug (3 prong input, 2 prong output).
I had a pair of Monarchy SM-70s (not the pro model) and never could get rid of all of the hum. I really liked the amps, but the hum bothered me in my near-field setup.
Enjoy,
TIC
Check the manual or contact Monarchy to verify the above.
Agreed with Rello that plugging both amps into a single duplex or quad outlet will tell you if you have a ground loop problem. Lastly, try lifting the A/C ground using a cheater plug (3 prong input, 2 prong output).
I had a pair of Monarchy SM-70s (not the pro model) and never could get rid of all of the hum. I really liked the amps, but the hum bothered me in my near-field setup.
Enjoy,
TIC