What speakers are you using now? Would they benefit from more power? Do you currently own the M80?
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I've owned 300b SET monoblocks for over 5 years and I'm familiar with the sound of some 845 amplifiers. Honestly I could live very happily listening to either.Many variables, what speaker is being driven? brand of amps and tubes as well, what are you seeking sonically? Listen and compare these two directly if this is possible. I can't see you going wrong with either of these amplifiers.