Al Klappenberger Posted February 22, 2001 Share Posted February 22, 2001 Hi guys, I have finally gotten the design for the Cornwall crossover network to where I think it's right. It should still be considered a preliminary design however. The frequency response looks good now anyhow. Two prototypes are on their way to a friend for careful listening tests. The design is downloadable from my web site for anyone who might be interested. Permission is granted to anyone who might be interested to build the design for his own person use. You will find it at the very bottom of the "Klipch corner" page. http://www.web-span.com/alk Al K Quote Link to comment Share on other sites More sharing options...
Colin Posted February 23, 2001 Share Posted February 23, 2001 how much assembled? what is the difference between that and the B2? will it solve the harsch ringing of the p trap? what does the chart infer? Can I upgrade if you make improvements? are there other products like this on the market? ------------------ Quote Link to comment Share on other sites More sharing options...
Bill W Posted February 24, 2001 Share Posted February 24, 2001 Hi Al, You ARE planning on creating a version for the HERESY aren't you??? (Just thought I'd mention it before you entertain any thoughts of heading for your Lazyboy recliner!!!) Thanks, Bill W. Quote Link to comment Share on other sites More sharing options...
Derek Posted February 24, 2001 Share Posted February 24, 2001 Al, You need to put a pix of Cornwall up there with the other speakers now. Derek Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted February 24, 2001 Author Share Posted February 24, 2001 Colin, That's a lot of questions in a little space! Anyhow... The price of the networks I will eventually build has not been established yet, but I wouldn't want to post prices on this board anyhow. Contact me by email in a few weeks. By then, everything should be nailed down and the listenings tests concluded. The B2 network is an entirely different sort of design from mine. I have used true diplexers which maintain a constant load impedance to the amplifier. This network also transforms the impedance to 4 Ohms. All top quality parts should make a difference also (Solen "Litz" inductors and polypropylene caps). The squawker is rolled off at a 12 dB / Octave rate which reduces the return rejected by the "P trap" by about 7 dB. The upgrade question will depend on what improvements I make. The only change I am thinking about is to increase the wire gauge of the two inductors in the woofer section of the network. The prototypes have used #14 and #18. I will definitely upgrade the larger one to #12 and I may increase the other to #16. Bigger is always better. The file was zipped using the standard "zip" format. Use DOS PKUNZIP or Windows WINZIP. As to the picture of the Cornwall for the web page, Yes, I just don't have a good one. The best I can do is scan the one in the paperwork that came with my Cornwall. A network for the Heresy is a possibility. In fact, this network for the Cornwall should work to some degree in the Heresy. It would be good for a center-fill speaker. The only problem is the bass will be reduced a bit since the Heresy requires more attenuation in the high frequency drivers then the Cornwall because its efficiency is lower. Al K Quote Link to comment Share on other sites More sharing options...
Marty65 Posted February 24, 2001 Share Posted February 24, 2001 Al, Will this crossover work in the Cornwall II which uses the K-34-E Woofer, K-57-K Midrange and the K-79-K Tweeter. I have a schematic of the crossover that was used in the Cornwall II if that would help. Thanks Dan Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted February 24, 2001 Author Share Posted February 24, 2001 Marty, The Cronwall I have and that the network was tested in has a K57-K squawker and K55M tweeter. It had a B-3 network from the factory. Comparing the levels set for the drivers by the B-2 and the B-3 networks implies that all are compatible with each other. The B-2 and B-3 use the same transformer taps and therefore the same levels. The K-79 tweeter is slightly less efficient than the K77, so I am not sure what that will do, but in the worst case I would think you would be hard presses to hear a 2 or 3 dB reduction in level over the range of a tweeter. After all, what's 3 dB when your speck is +-3 dB at best and the listening room makes reality more like +-5 dB or more! I would like to see the Cornwall II network diagram if you would care to email it to me. AL K. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted February 24, 2001 Author Share Posted February 24, 2001 Hi guys, IMPORTANT NOTE: Since my earlier post Marty65 sent me the network diagram for the Cornwall II. The Cornwall II is NOT compatible with my new design. This is becasue of the lower sensitivity tweeter. You can tell which speakers ARE compatible by looking at the tweeter. If it has the K77 tweeter it IS compatible. If it has the k79, it is NOT. Al K. Quote Link to comment Share on other sites More sharing options...
Colin Posted February 25, 2001 Share Posted February 25, 2001 great info, nice work, PKunzip worked, will be very interested in about a month, after I move Quote Link to comment Share on other sites More sharing options...
Colin Posted February 25, 2001 Share Posted February 25, 2001 why go out to the terminal strip and not run directly into the board? also, just checking but if my big old horns have K-33-E woofers, K-51-V metal mid-range horn and K-77-M metal tweeter horn with the B-2 crossover board, and serial #s32x57 and 32x58, then they are Cornwalls somewhere between Is and IIs, correct? ------------------ Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted February 25, 2001 Author Share Posted February 25, 2001 Colin, I don't understand you question about the terminal strip and board. You are going to have to explain that a bit more! If you have the B-2 network, it's set at the same levels as my new design and should be compatible. I really don't know when the K51 squawker was used. I think the B-2 network dates it before 1985 since my Cornwall has a B-3 and a K57-K squawker. Al K. Quote Link to comment Share on other sites More sharing options...
JCturboT Posted February 25, 2001 Share Posted February 25, 2001 Al, What year are your Cornwalls? I'm curious because my Cornwalls (84) have the same B3 crossover and K77M tweeter as yours.Will you be selling your new X-overs?what is the cost? Jeff Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted February 26, 2001 Author Share Posted February 26, 2001 Jeff, My Cornwall was made in 1985. Yes, I will eventually be building them for anyone who wants them. The price is not established yet, but it will be a little higher than the ones I am making for the Khorn and La Scala. This design has more parts. Al K. Quote Link to comment Share on other sites More sharing options...
Colin Posted February 27, 2001 Share Posted February 27, 2001 sorry a little busy lately and I get fed up with how slow these cable modems can be , but what I menat was that the signal goes from the speaker wire to a terminal strip on the outside of the speak, through wires to the cross-over and through more wires again to the drivers, why not run the speaker righ through the back and onto the cross-over and skip the terminal strip altogther? Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted February 27, 2001 Author Share Posted February 27, 2001 Colin, You certainly can! Here's a guy that did just that and posted a picture just rescently: http://www.klipsch.com/ubb/Forum6/HTML/000365.html The only drawback to it is it makes it harder to get the network in and out of the speaker. I have to think about how hard it is to install them when i build one for someone else. If you build it yourself you can make the connections any way you like. Al K. Quote Link to comment Share on other sites More sharing options...
dc270 Posted January 28, 2012 Share Posted January 28, 2012 I know this is an old thread, but none the less had to report how very satisfied I am with the ALK networks for my 1980 CW1's. I also moved the horns to front mount and wrapped the woofer & horn lens for further improvements. Thanks again for an excellent design- made a world of audio differance! DC Quote Link to comment Share on other sites More sharing options...
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