Sorry if this isn't the right thread to post this in, I'm still new here. I picked up some ESS AMT 1Cs for a bargain, however they are missing the rear speaker, not sure if they were passive radiators or not. However I figure this gives me an opportunity to upgrade the speakers since I've read the real star of the show is the heil transformers with the speakers being somewhat unremarkable. I don't want to put crazy money into these since I got them for $150, but I am willing to spend up to $400 to get them fixed up and sounding nice. Any recommendations for some replacement speakers to put in these? Any information on them at all would be helpful! Thank you!