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To my knowledge the KG4 uses two 8ohm woofers in parallel while the KG2 uses a single 4ohm... So they would not be interchangeable.

Titanium vs Polyamide... thats the only difference I noted?

I believe I understand what you are saying but to my knowledge none of the K55 drivers exits actually match the K700 throat opening? It's generally not a concern for designers as the chamber up to the threaded mount is just for building compression. The actual sound wave starts at the throat opening. I would personally error on the side of a smooth transition as well if I were designing from scratch but I am not. If it helps to understand, I am attempting to compare the combination of K79 / K53 and K792 (w/K79 motor) / K66 (w/K52 adapter/motor)... I feel like this is the fairest comparison of the 2 horn sets as possible...

This is a long shot but I need the 1 3/8-18 adapter from a K52H/K52K for testing. I found a guy on eBay who sells new units he makes himself but they are more than I would like to spend on something I may not even use? I have an extra K53K if somebody needs one and wants to trade?

You should be able to put a K-53 or K-52 in your KP-250 II's if you want but the drivers you have are what came with them? Since I can't see your horns and you make them sound homemade, I don't know about them? There is a picture of the KP-66-E, which is the correct horn/driver for your speaker, contained within the the post bearing its name in this section.

Yes, Bob Crites diaphragms fit the KP-792/K-107.

I ended up picking up a pair to check out for myself. They should be hear this week... only problem is I don't have any drivers... I was hoping I could find a K52H or at least the 1 3/8"-18 adapter for decent price but so far I haven't had any luck?

This is your mid driver: http://www.parts-express.com/pe/showdetl.cfm?partnumber=290-446 This is the replacement mid diaphragm: http://www.parts-express.com/pe/showdetl.cfm?partnumber=290-449 This is your best solution for a replacement tweeter diaphragm: http://www.critesspeakers.com/klipsch_tweeters.html (same as:K-76, K-63, K-74, K-75, K-76, K-79, K-83, K-84, K-85, K-88, K-90, K63, K74, K75, K76, K83, K84, K85, K88, K90) Hope this gets you back up and running.

It should also be noted that the ALK networks are made out of substantially better components... Unless you build it yourself out of inferior pieces?

$300 per speaker, yes. It's actually a pretty good deal if you are looking to do the whole conversion at once. A lot of people don't set out to do the whole thing at once though... They might pick up a piece here and a piece there via eBay or craigslist or forum sales. I know I didn't set out to do an HIII conversion but end up with most of the pieces via the means I stated?

A lot of his stuff an be found on his website but there are certain option or variations that can be found on various sites/forums. I will send you a pm this weekend to share what I have/know.

Yeah, THSR = Theater Heresy Surround... I recognized those as soon as I saw them. I own a pair of THSR-2's that I converted to 3way, though mine was a slightly easier project. On the 2's they used the same motorboard as the standard Heresy II but they covered the tweeter cut out with a piece of 1/4 inch ply. The thing that surprised me about yours is that they used a K53 and mounted it to the back of the motorboard like the K55? Honestly if I were you I might opt to build a mount for a tweeter to place on top, unless you are really good with a router? You would actually end up with more freedom to try out different tweeters that way? Whatever you decide I think you did alright price wise. Yeah, you could have gotten a better deal but if push came to shove you could easily part these out and make your money back and I'd call that good.

If I were him I would have... but if he has I get the impression he doesn't want to share right now... maybe for legal reasons? When I asked originally the most common answer I got was something to the tune of "Klipsch doesn't share schematics of models currently in production".

No, the HIII does not use an autoformer... It uses a series of resistors to pad down the squawker and tweeter. Also, none of the HIII components can be used with a stock HII crossover properly. The K28 is 4 ohms not 8 like the K22/K24, the Ti diaphragm in the K53 doesn't drop off at 6K like the phenolic so a band pass is required and the K107/K792 has at least 3db more output than the K76. The result of using a stock HII network with these components would leave you with heavily reduced response between 400ish and 700ish Hz and you would have a pretty good spike after 6KHz... I have the K28 and K792 as well but decided not to bother with the K53Ti because it seemed to create more problems than it solved and I wanted to keep my build simple. I'm still not even totally sold on the K107/K792 either? I love the Ti diaphragm but the tractix horn isn't really so much better as different and the larger motor means it has to be padded down to match the other components. If you or any one else wanted to use those 3 components with out the stock HIII network I would say a variation of the ALK Universal is your best bet. It would give you the bandpass needed for the K53Ti, a better teeter circuit than stock and is easily built/bought/modified.

I believe the information on this page should answer your question... http://www.critesspeakers.com/klipsch_midrange.html

Thank you. I combed Bobs thread before this post. It's actually what lead me to post this question. To explain: A while back I asked around for a an HIII schematic to look over but was only to secure a CWIII. For what I wanted it for it was close enough given the shared components. After play around with the K107 I just got, I remembered Bob's comment about the HIII kit being a hair quieter than the HII. I know first hand that the K107 is in no way quieter than the K76 so re-reviewed his post and noticed the 3ohm. It was the only one of the 4 resistors in the circuit I could make out. The funny thing about that though is that the CWIII only has 3 resistors in it's circuit. Due to Bob's comment and the value and location of the 3 ohm resistor I deduced that it is probably a pad in the tweeter circuit. I basically made this post to see if I was right. The crazy thing your photo showed me is that one of the resistors in the mid circuit is a 20 ohm. Which is weird because if anything I would have expected the HIII values to be greater not less than the CWIII? At this point I have no real need for an HIII schem anymore but I am even more curious about it... Thank you again for your help

In case any one is curious this is a KP66E...

I think you may have misunderstood my question. I was asking if the tractrix horn of the KP65 & KP66 was capable of crossing as low is it's exponential counterpart the K701. Because it appeared to be designed more to be a tractrix horn with a K701 mouth/mount than to be a tractrix that would go down to 700Hz I was skeptical. Adding to my skepticism was the fact that the stock Eminence drivers used in the 65 & 66 are generally only rated down to 1-1.2KHz. Since I don't have one to test I was hoping some one might be able to supply some data that either supported my assumption or the fact that the horn was capable of being used down to 700Hz. In a way I kind of got both? Both the driver and the horn have been used by Klipsch to achieve crossover points below 1K but I believe doing so is really stretching it...?

I would need to see both boards from multiple angles to trace everything out to get the answer I am looking for... That picture did show me something interesting though. I was under the impression the 4 resistors found within the network were 3, 30, 50 & 1ohm? It looks like either the 30 or 50 is actually 20ohms. If you still have the network out and lying around would you be able to list the resistor values for me? Thank you for your help

Sorry, I didn't see the PDF you attached. And actually the 2nd PDF list a KP-2502-C that used the KP-66-E crossed at 700Hz so I guess it is capable of going that low? Thank you again.

I looked it up real quick and Klipsch spec has it listed as 1.4kHz? This seems about right for the driver, I am unfamiliar with the horn though. Thank you for trying to help.

Can somebody with an HIII verify that there is a resistor in line with this tweeter? I believe it's 3ohm? Thanks

Can anyone tell me if the horn that accompanies these units will actually go down to 700Hz? I know the drivers, eminence PSD-2002S-8 & PSD-2002S-16 respectively, don't really excel that low? I can't find a schematic for anything these are found in either? Thanks

Also, in playing around with my new 792's I finally figured out why the Forte's use a 40ohm resistor in parrallel with the K75. It seems obvious now but hindsight is always 20/20... the larger magnet structure increase both the resistance and inductance of the voice coil. You basically have to use the resistor to knock it down to 8ohms. In case anyone is curious here are the measurements I took (@ 1khz) using my Crites Ti diaphragm: w/ no magnet R=8.3 L=.07 w/ 76 R=9.4 L=.38 w/ 792 R=11 L=.58 As for how they fit into my project... I'm still not sure? The 792 magnet makes the HX a little too bright for my taste but I could easily see some people liking it just the way it is? And alone, using a simple 1st order filter (1.5uf), I prefer the tractix horn but when mounted within the HX both horns have their good and bad points? Right now I would probably lean toward the tractix w/ the 76 magnet but I could pad down the 792 magnet or just stick with the original K76 setup?

A some what out of focus but serviceable picture of the rest of the dampening material in place