Power Amplifier conundrum.


I have an old Nikko seperates system Alpha II power amp, gamma 1 tuner, beta II preamp, and EQ1 equalizer. I also have an old Nikko turntable, and a newer Cambridge Audio 540C cd player. Speakers are Klipsch KG4 w/ a DCM 10 subwoofer.
I recently aquired a set of Tannoy Reveal monitors an a 2nd DCM 10 subwoofer.
Here is my question/problem: I have a 2 room office /studio and want to hook up the Tannoy-DCM in the one area and the Klipsch-DCM in the other. I hooked all but the 2nd dcm sub up and after a short while the left channel became scratchy.Turning off 1 set of the speakers and it stopped.( I have an adcom 4 speaker selector switch) I pulled out the amp brochure and there are warnings about running mixed ohm speakers.
I would like to be able to run the system in both areas, and also only in one area or the other as need be. The Beta II will allow the hookup of a second amp if desired so:
1. Could I source another Alpha II and run the second set of speakers off that?
2. Should I consider upgrading the amp? If so what Brand and model would you recommend to carry this load without amp damage?
3. Should I consider a 3 or 5 channel amp? If so what brand and type would you recommend?
The kicker also is budget. I have 2 in college and would like to keep it under $500 if possible.

Thank you in advance for your thoughts and suggestions.
roofmeister

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