I danced with Heresy for a bit and did the following to bring out the best in them. However, I should qualify that these mods were with the 1.5's. But, you should consider some if not most of them.
1) tube amp
2) place the speakers on stands that brings the tweeters up to ear level
3) place some mic foam wind screen in the throats of the mid horn
4) upgrade the crossover Crites
5) upgrade internal wires
6) upgrade binding post
7) damp internal cabinet
8) add sub woofer
9) aim them straight forward not at the listening position. Or only slightly toed in.
this changes the stock speaker to a bit different design but, IMO, greatly improves a speaker that has many short comings to one that is enjoyable.
1) tube amp
2) place the speakers on stands that brings the tweeters up to ear level
3) place some mic foam wind screen in the throats of the mid horn
4) upgrade the crossover Crites
5) upgrade internal wires
6) upgrade binding post
7) damp internal cabinet
8) add sub woofer
9) aim them straight forward not at the listening position. Or only slightly toed in.
this changes the stock speaker to a bit different design but, IMO, greatly improves a speaker that has many short comings to one that is enjoyable.