Try this web-site, as it is a web-site for classic AR speakers. I am more familiar with the AR5 and am now running the current day (1995) versions of them (AR302). I am using a tube integrated amp (Prima Luna Prologue 2). My listening room is 1/10 the size of your room and it takes very little volume to get the speakers to play at a decent level. Here's the web-site ...
http://www.classicspeakerpages.net/
Regards, Rich
http://www.classicspeakerpages.net/
Regards, Rich