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Hey everyone... did a rewrite of this to share more about the project Im working on. Ive been a fan of Klipsch and tube amps for a long time. Given my amp choices, horn or single driver speakers are the preferred choices. Normally I build big honking speakers... I even built one my wife kicked out of the house... too large. In an effort to finally get some speakers in the TV room I went after something she has accepted before... the Heresy. She has liked it before due to its limited height... it doesn't block the windows. I love it as, its a 1950s VW battle with a Porsche engine hiding under the hood. The Heresy is an honest 96db speaker. Good for 50hz or so on up. Its a sealed box so no bass hump. Its mid bad is solid and its a fast speaker. Id consider it a gateway drug. I went of CL in search of a local purchase. In a perfect world I would have found a gen 1 heresy. You want this type as it has the screw on K55 driver... the same mid range in other Klipsch speakers like the Cornwall, LaScala or K Horn. Unfortunately as I planed to gut the speaker and start over, the only one in my price point was beatup and a gen 1.5 Heresy. $400 later it was delivered to my door. The plan is to use a ALK Crossover. Its adjustable and will make a Heresy actually sound good. Attenuating the mid and HF is super important and I still have HF hear and want to keep it that way. The woofers as K22 are perfectly fine.. maybe even good, but the Eminence LFA12 is better and closer to the pro K24 spec. The Tweeter as a K77 is good. Its even rebuild able now with new diaphragms should you need, but as I have access to Fastlane audio's elliptical tweeter... why not use a modern bad *** tweeter instead. Fastlane's tweeter lens is $100 for pair. The B&C DE10 or DE120 are my choices and are fantastic. I might go with Eminence ASD1001B as its American made and a solid performer too. I measured the drivers and got to selling all the parts I would not use on eBay. The Mid horns were the usable but not my cup, K701 with the bold on K53. (No one wants a K53/K701 combo). It got sold off for $100 to a local buyer who had his own project. I was able to purchase a K700/K55 push pin style (My preference on the K55) for $180 to my door. Normally this would be $200-$240 but I got a good deal. This will now make the Heresy a OG classic which has been upgraded. Same looking horn, but metal instead of ABS and Screw on instead of bolt on. (You can roll drivers if you wanted to now.). The cabs were less than ideal. Klipsch builds with 3/4" ply and 1/2" ply for he back panel. We laminated 1/4" to all the sides of the speaker... giving us a new corner edge and a stiffer cabinet. The front and back are edge banded to hide the lamination. The inside of the back panel had 1/4 MDF added. This will provide a key to center the back panel and panel increased surface area when its inset inside the cabinet... Long story short, its a hair smaller now but a ton stiffer. Additionally I love the look of slant risers on the Heresy. I went to Bob writes and ordered a set. Ebay sales: K77 Tweeters sold for $90 E2 Crossovers sold for $50 K22 Woofers sold for $80 New parts: ALK CSW700 crossover $350 Eminence 12LFA $130 Fastlane audio Tweeter Lens $100 Eminence ASD1001B $50 pair K700/K55 $180 Wood Work $200 for extra ply/finishing costs $40 for the slant risers ____________________________ $810 $240 -$220 Total: $830 Im into the whole speaker for ~$1250. Its a lot of money for sure, but there is no way it would sound remotely as good. Work has just started but I wanted to show the starting point, and plan. Here are the before pics.