Do the Heresy's require a sub? That is a deal breaker IMO. My song towers do not need a sub, and I've found that none of my vintage amps/receivers lack bass while driving them. And they all have the loudness button, which I don't use very often. Seems to muddle the bass, especially with the 317.
the Heresy’s were really good when they first came out but by today’s standards they have issues. They really need subs and both the mid range horn and tweeter horn produce peaks and valleys which are ok at low levels but if you crank them up just a bit they will hurt your ears.