I guess you already bought your amp, but I can't resist sharing a few comments on these lovely old speakers.
I am listening to my RS4s as I type this. Bought them in December '78 and have never found a reason to get rid of them. No - they're not the ultimate audiophile loudspeaker, but incredibly difficult to tire of. Very warm, comforting, BBC sound. Not good for high levels (the crossovers tend to melt, leading to 1/2 hour's soldering to put everything back into the PCB) and not efficient - I have had best results driving them with something around 80-100W RMS. Currently they are playing MP3s from my PC via a 100WPC Crimson Elektrik (circa 1980) power amp. A couple of decent stands (shot-filled is good) to lift them about 18" off the floor tidies up the bottom end. Just don't drive them with anything that's woolly in the bottom end - my worst ever mistake was a Velleman valve amp - sweet at the top, but utterly suffocating in the bass. Get the amplification right and enjoy!
I am listening to my RS4s as I type this. Bought them in December '78 and have never found a reason to get rid of them. No - they're not the ultimate audiophile loudspeaker, but incredibly difficult to tire of. Very warm, comforting, BBC sound. Not good for high levels (the crossovers tend to melt, leading to 1/2 hour's soldering to put everything back into the PCB) and not efficient - I have had best results driving them with something around 80-100W RMS. Currently they are playing MP3s from my PC via a 100WPC Crimson Elektrik (circa 1980) power amp. A couple of decent stands (shot-filled is good) to lift them about 18" off the floor tidies up the bottom end. Just don't drive them with anything that's woolly in the bottom end - my worst ever mistake was a Velleman valve amp - sweet at the top, but utterly suffocating in the bass. Get the amplification right and enjoy!