Is there a clear difference between the 'high power' versions of the M60 and M80, and is there a huge difference between the two? It's important to me to have decent bass with two channel sound for music. Wondering if the M60 'high power' unit would work with my vintage receivers, or even my newer Marantz receiver? I'm starting to lean back to the nice real wood cabinets and price of the Axioms, and the M60 seems like quite the speaker.