It could be the power transformer causing the hum.
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Thanks for your response Dan. I read here that Maggie's high end really benefit from a tube amp. I have a Denon AVR 5800 which is a beast power wise, and I use it at it's "pure direct" setting when listening to music, which bypasses all electrical circuits. I was thinking of using this for the low end and perhaps, after reading about the tube amp, looking for one of those for the high end. The problem I have is funds. I am rather limited and tube amps seem to average a lot higher per watt compared to solid state. I expect that I will need 150 watts or so to make this work.
I am new to bi-amping and I am also wondering if an active crossover is necessary, and if so, which is the best to get that is reasonable?