Just acquired a second Hitachi HMA 7500, legendary amp from 70s, revamped by Approved Audio, and want to use both amps with my Kef LS50s. I would double up the speaker cables. What damage could I cause?
Yes, as Kr4 stated...bad idea to double them up. How about bridge them if possible, or even use them as mono amps....one channel of amp 1 for the left speaker, and one channel of amp 2 for the right? It may improve separation compared to running one amp in stereo. Give it a try and let us know....
The problem is that your speaker would create a pathway AKA circuit that the power from amp one would travel to another. I am embarrassed to say I have done this experiment. The only way you might be able to biAmp is to use a really carefully designed crossover outside the speaker that would override your speaker's one crossover (wich should be disconnected). It is a major undertaking some of the other suggestions make sense e.g. bridging etc.
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