Well, I woud not be surprised if I am the only one that knows anything about these. They were made in England circa 79-81. They used drivers by Audax of France. An 8" bextrene woofer mid and the ubiquitous 1" soft dome tweeter that almost everybody was using at this time. The Bextrene driver was a nice sounding unit but was very inefficient at around 84 db and also did not handle much power, around 40 watts rms was it. So the RS4 is a very British sounding speaker, if memory serves, warm and full in the bottom and slightly rolled on top. Because it is so inefficient and very limited as to how loud it can play it is definitely not for headbangers. I would say that you need an amp with a little grunt to drive these. The NAD would probably do it. I would go with an amp that has a neutral balance rather than overtly warm simply because the RS4's are already on the warm side.
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