Threshold Model S/500 STATIS power amplifier

 Hi,

I picked up this amplifier(Threshold S/500 STATIS power amp)  up at an Estate Sale with Weber wire speaker cable. Can anyone tell me more about the amplifier? I've have several solid state amps ( NAD, Parasound, Audio Research, Legacy (made by Coda), etc.... Can anyone tell me a little bit about this amp and what it may be worth? (Insurance purposes). Also picked up a THETA DSPro Generation five digital signal processor and a Furman IT-Reference 20i power conditioner. Not really sure what any of it is worth.

 Thanks for your help, Rick