I understand that the AMC line was fairly good, somewhat high end for its time, some models get sold for 1200 a pair, depending, on the classic market, but the company was likely one of those who came and went in the high end competitive climate of the late sixties/seventies. Most these days would be rebuilds with replaced comparable drivers, not actually the original pristine units, and have low market recognition, so hard to say. Probably worth hanging onto for their sonic properties. Someone compared the 12's to the bigger JBL floor monitors, as a clone. I knew someone in Michigan with a pair of their medium sized towers. My personal appreciation was that they were OK sounding, but not high end.