Yamaha626 really nailed it in his response. Ill add my agreement to what he offered in case you were looking for additional confirmation. If it is shippable, USAM and ebay are easy and popular. If in-person pickup is preferred than FB marketplace or ebay (offer local pickup only) are your options.
I have had good luck on FB marketplace, but because the audio buyers are so limited, you have to be very patient. Not 6 weeks patient, sometimes 6 or 9 months patient.
There are a couple other options. I have never sold on Reverb for example, but as a buyer I see their adds and listings all the time. I see a decent deal there occasionally, but i often feel their listings are priced high, and at the same time it seems that their buyers are also going to be checking USAM, FB, ebay before making that purchase.
Good luck. Price it reasonable, then just sit and wait. Lots of patience. If you want it gone fast, ebay local will do that, but you might only get your opening bid if it is low enough, so set it accordingly.
Elon
Ezspeakersolutions.com
