So far, all I can say it totally sounds even better than the Ported Box model suggests. Slamming bass, better treble and midrange detail, and all based on the "domino effect" of a Klipsch K-42 woofer upgrade. This is a pretty simple and straightforward upgrade to the sound of a Heresy, which makes it sound more like a Cornwall, but not as low, with similar efficiency gain. It's not cheap, just GOOD. Also a killer new tweeter and Xover mods. More later. As of today, 5/24/2017, I"m amending my com