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garebear, I have owned Accuphase equipment and can say definitively that there is no better build quality on the market. The stuff will last forever. Why it does not get more traction in the States is beyond me. The Class A amps are gorgeous sounding right up there with Pass, Boulder and probably even Constellation. Cosmetically, they have a jewel like quality the other amps are missing. Those amps are more industrial in character.
…...thank you again mijostyn and it has nothing to due about being able to afford one of those two amps nor about the power. I am however more interested in the presentation and or musicality of going with Accuphase's class A powered amps or their a/b amps. I guess that current owners of either one of these amps never compared or thought about the sonic differences. Stay safe...
garebear, I have both, “A" and “AB" Class Accuphase amps, p4500/a48, and somehow mostly in use is p4500. These amps have pretty much the same improved input stage designs, but completely different output power stage circuits. I found A48 sounds little bit more “liquid”, on some reference quality sound tracks, but overall both amps are very good, transparent, punchy and “airy”.
I have not heard the above amps you mention , I do have the accuphase a65 driving dynaudio s25 in a 6m x 10m room with similar speaker sensitivity and no problem hitting 100 db. Love the sound of class a.
Knowing the accuphase sound I would say both the 7300 and 75 will drive your speaker insanely well , both have 1000 dampening but the 75 has a bigger power supply with 200 uf vs 122uf for the 7300. The 7300 has a slight advantage in s/n .
Being a class a guy I would opt for the 75 , I think either would be great.