Overall I agree with @mrdecibel but really did enjoy a Tube Amp and Tube Pre with my Heresy 1's . I even ran a Tube DAC with them to take some of the brightness out as they were usually in smaller room. My son now has them and uses an old but fully restored solid state Luxman 100U and I was pleasantly surprised how well they sounded.
The crossovers were updated by Crites . I sent them in and they were reasonable to ship and have them do the work correctly. I sent the crossovers in only, not the speakers.