rescued Acoustic Research 152 Spirit speakers

Our local trash site sorts groups stuff into categories for recycling; computers/tv&hifi/paper etc. You can have a look and help yourself to the odd thing after a quiet word with the guy in charge. I rescued lovely mid-80's Denon amp recently and a good pr of AR Spirit 152' speakers this week. But I can't find any Tech Specs on the 152's, and danced all over the net. Can anybody help?
Thanks guys
wharryburn