Currently, they are only building the REF500S stereo amp. The REF500M have been discontinued for quite a while already. The more recent REF600M are quite a step up from the former REF500M.
I will take a look at the ref600. I'll almost certainly be looking for used goods, for reasons of price. Don't know if there are many examples of the ref600 on the used market...
Mostly I was trying to understand if there was a significant difference between the ref500s and the ref500m monoblocks
The REF500M monos are a step up from the REF500S stereo amp, but it has been a long time since I've compared the two that I can't fully recall the differences.
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