Ive got a pair of these old German speakers from 1982. They are in pretty good conditions except the grills have a few dings, and unlike the picture below, I have lost the little Canton plastic logo on the bottom. Id call them "fair" condition cosmetically. They were $1350 in 1982, which would be $3600 in today's dollars. I would expect them to be fully depreciated by now from an accounting standpoint but I imagine I could still get something for them. Is $500 unreasonable for such old speakers?
Cantons sounded pretty good. I used to use a set of Canton bookshelf monitors - don't remember the model number now. In any case, do some google and see what they are selling for, and if you can't find a price then sure $500 is a good starting point. If they sell immediately you'll know you started too low, if no one bites then you are too high.
I would rather have questions that can't be answered than answers that can't be questioned. - Richard Feynman
Yeah I'd start there. You'd probably get $200-$300 for them local. Good luck.
Transport: Sony UBP-X700 UHD-Blu ray player spdif PC using Musiland Digital Times WASAPI via BNC connection - DAC: DC-1->XLR XPA-1 , RCA->Basx A-100 CD: Denon DCD 600 PCM 61 DAC. RCA Amp: XPA-1 gen 2 using XLR connections. Speakers: Axiom Audio m80 V3, Sennheisser HD700 headphones. two pairs 12 guage each bi-wire speaker cables per monoblock Headphone amp: Basx A-100 (INCREDIBLE VALUE!!)