Dan Jones 61

I recently acquired a pair of KLH model 28's. I know they are rare, but are they collectible? They are too much speaker for me, so I'll probably be selling them. Man can they part your hair. I'm just trying to figure out what I got. Thank you for any help. DJ BTW I have AR-5, AR-2ax, AR-4ax, and KLH 17's. I like them all.