Acoustic Research AR4x Speakers (Feasterville)

A pair of AR4x speakers, circa 1970, in oiled walnut. They work (were in service up until a couple months ago) but tweeter adjustment pots are noisy and/or only semi-functional; if you set them to max and fiddle/wiggle a little bit, you can get them to work. I'm sure they could be cleaned and/or replaced by someone knowledgeable. Grill cloth panels need some new Velcro.