I replaced an HPA 3 with an ML 433, and the difference was there, but not huge, I still have an HPA covering my rears, great amps and for the money, one of the best buys in used audio IMHO.
Russ: If you're looking at buying one of the 2 channel amps I would recommend the HPA-2 over the smaller BPA-2. I had both and the HPA was a much better amp IMO. Not just more wattage but it really handles difficult speakers and sounded better from top to bottom. I was very happy using it with a tube preamp.
I recall some posters saying it didnt sound much different from the Levinson 431 that replaced it.
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