Dad's Estate: Where best to get approx. $$ values for selling high-end stereo equipment?

My Dad was an audiophile and ham radio opr.  He loved his music and seems he bought a lot of high-end pieces.  In particular, so far upon a quick glance, he had (now me to sell) a Soundcraftsmen Amp, Model MA5002  (have sold for $300 and $600 for same thing on eBay) and two beautiful JBL speakers (woofers?), Acoustic Research Model AR-1W.  They are very tall and heavy with beautiful walnut wood case and look pristine.  Also have a Soundcraftsmen Equalizer, Model RP 2212 (just sold 1 of 2).  Everything looks pristine.  Where is best place to go online to get a FAIR selling value - to sell, I guess, on eBay???  (Or, is there a better place?).  I am not knowledgeable about this equipment and want to get a fair price and not be "low balled".  Thank you.