I had the opportunity to listen to both the Heresy IV and Forte III yesterday, putting both through their respective paces with a playlist of Al DiMeola, Rob Wasserman, Alison Krauss, aria from La Wally, Japanese Drums, Don Shirley, Ron Carter, Brad Mehldau and Sade; short of teeing up Zeppelin, it was a diverse playlist. Frankly, I was disappointed by the Fortes in comparison - the Forte midrange was not as supportive of vocals as that of the Heresy. Bass on the Heresy, located 2 feet from the back wall, was absolutely superb; every pluck of Wasserman and Carter's fingers was perfectly rendered - very fast action ( thanks to the porting ?). I purchased a pair of the Heresy IVs but must forewarn all that these speakers require both the highest quality source material and well-matched components; your average bluetooth streaming service will leave you disappointed on some tracks. Now, where's that Joe Satriani ?!?