Al Klappenberger Posted March 28, 2001 Share Posted March 28, 2001 Dan, DON'T do it! I have no idea of the efficiency of that tweeter and if it isn't the same as the K77 everything will be wrong! I will bet you that tweeter is lower efficiency than the K77! I'll almost GUARANTEE it's lower! By the way, for people with Cornwalls, there is no reason to use 400V FastCaps. The 250V PA### are fine. The voltages in a crossover network are nowhere near that high even at ear-splitting levels! Al K. Quote Link to comment Share on other sites More sharing options...
oregon_guy Posted March 28, 2001 Share Posted March 28, 2001 Al, geez... now I'm really confused. Here's a snippet of dialogue we had on March 21: Dan McAdam says: >-Would you be willing to provide a guiding hand if I attempt to modify your >Cornwall design to my Heresys? Al says: The only thing necessary is to move the taps on the autotransformer down one (both squawker and tweeter) and change the value of the swamping resistor connected from tap 5 to ground (tap 0). I think it it drops to 4.7 Ohms, but I will have to verify that. what up bro? Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted March 28, 2001 Share Posted March 28, 2001 Dan, Sorry. I didn't realize you had a different tweeter and you got to remember that I have been thinking about the Cornwall. I don't know much about the Heresy. I don't have one! If you can find out the sensivity of each of the drivers in the Heresy II I might be able to adapt it though. It's not just a matter of moving the taps unless you can move the squawker and tweeter taps together by the same amount. Al K. Quote Link to comment Share on other sites More sharing options...
oregon_guy Posted March 28, 2001 Share Posted March 28, 2001 that's cool Al, I've been trying to piece together enough information to try and modify your Cornwall I design for my Heresys by talking with you and with Paul Keller. What I was trying to do was get all the information up front before I took my Heresy's apart. But, it looks like thats what I need to do (since the back doesn't come off the Heresy IIs). I'll pull the guts out and post some photos and detail all the specs. Then we can go from there, ok? I really can't even listen to my Hereseys at this point (no, they're not that bad, or broken or anything). I just find that they stress my ears out, even at low volumes. I've analyzed it (subjectively) and think that my auditory system is 'tensing up' when I listen to the Heresys. Its actually a phenomenon known as 'acoustic reflex' (a personally variable physiological muscle contraction of the stapedius muscle in the middle ear cavity in response to loudness. It serves a natural protective function to 'dampen' the ossicles (the 'hammer, anvil, and stirrup') bones in the middle ear.) When you experience this muscle contraction repeatedly in a short time or for extended periods, the muscles in your skull and upper jaw area get stressed out too and so on and so forth.... anyway, my previous experience with Klipsch speakers has been with the Corner Horns and the La Scalas, and I think I'm going to have to move up to La Scalas to get the sound I'm looking for. We'll see, after I get these Hereseys modified. thanks everyone, this is a really great resource, and I hope to be able to give back for all the help I'm getting here... later Al, Dan Quote Link to comment Share on other sites More sharing options...
johns02 Posted March 28, 2001 Author Share Posted March 28, 2001 Al, I have a pair of CP-1 crossovers. Can I use the T2A auto-tx for your design? They have a total of 6 terminal taps Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted March 28, 2001 Share Posted March 28, 2001 Johns, If it is clearly marked "T2A" then it is compatible with my design. You just won't have the extra "X" tap. There are other combinations that will almost duplicate the levels available with the "X" tap using tap #4. Al K. Quote Link to comment Share on other sites More sharing options...
oregon_guy Posted March 29, 2001 Share Posted March 29, 2001 Al, in reference to your information on modifying your crossover design for the Heresy IIs: please check out this url: http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1225143548 I'm interested to know if you think it possible to replace the tweeter in my H2s with these K-77s, and also to see what you make of the claims this guy is stating in the description of these horns. Paul K, please chime in.... thanks guys Dan Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted March 29, 2001 Share Posted March 29, 2001 Dan, Yes, that is the T-35 and is the tweeter used in the older Heresy. I would not jump at a change like that until I examined the squawker you have. There may be better alternatives! If you, or somebody would eMail me the diagram of the crossover used in the Heresy II it might tell me what I need to know. Al K. Quote Link to comment Share on other sites More sharing options...
oregon_guy Posted March 29, 2001 Share Posted March 29, 2001 Al, I'm going to attempt to extract my crossover this weekend and photograph it. Presumably, I'll be able to jot down whatever is written on the parts I can see. Do you know of anyone who has the schematic for the H2 network? (you're Belles are looking better all the time, Al!!) best, Dan Quote Link to comment Share on other sites More sharing options...
johns02 Posted March 29, 2001 Author Share Posted March 29, 2001 How would you measure the chokes? Al, any crude ways to measure these coils? Meter,scope,generator,load resistors? Quote Link to comment Share on other sites More sharing options...
Pete C Posted April 23, 2001 Share Posted April 23, 2001 And then, it goes private... Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted April 23, 2001 Share Posted April 23, 2001 Johns, Sorry I didn't see your question about measuring inductance. I though the thread died! The answer is that there is no easy way to do it. You either need a calirated bridge (inductance bridge or impedance bridge) or a capacitor standard and measure resonance. That method is not easy though. Al K. Quote Link to comment Share on other sites More sharing options...
Workin' Stiff Posted May 1, 2001 Share Posted May 1, 2001 I downloaded the design file for the Khorn Xover. In the part list file (parts.txt) there is an item listed as: Item 2.2 uFd. +-5% Hovland Music-cap I understand this to be a 2.2 "micro" Farad capacitor. On the www.madisound.com page there is only a 2.2 mFd. I would understand that to be a 2.2 "milli" Farad capacitor. Is one of these a misprint or I am I just dumb? Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted May 1, 2001 Share Posted May 1, 2001 Stif, Your right.. it's Micro Farads. 2.2 X 10^-6 Farads. Al K. Quote Link to comment Share on other sites More sharing options...
Workin' Stiff Posted May 1, 2001 Share Posted May 1, 2001 Uhhhh.......there is no "2.2 uFd (microFarad) +-5% Hovland Music-cap" at www.madisound.com I can't find it anywhere. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted May 3, 2001 Share Posted May 3, 2001 Stiff, I looked at Madiscound. Thd do have them, they just call tme 2.2 mFd rather than uFd. That's wrong in my book, but it is the right cap. Look under "Catalog" on the bottom of the home page. Al K. Quote Link to comment Share on other sites More sharing options...
Workin' Stiff Posted May 4, 2001 Share Posted May 4, 2001 Thank you Mr. K Quote Link to comment Share on other sites More sharing options...
Earfull Posted July 26, 2001 Share Posted July 26, 2001 Saved By The Klipsh: just ordered my ALK upgrades for my pair of 1978 KHorns... bought 'em when I was an intern. Had already 'upgraded' them with the AA Crossover network...now, want even better, as my hearing is not what it used to be (jazz / rock / blues drumming for over 30 years!!) Can't wait to get them...and revitalize my 'drums.' Will let ya'll know how they sound...! ------------------ "Your Vacuous Message Here" Quote Link to comment Share on other sites More sharing options...
Charles Turner Posted July 27, 2001 Share Posted July 27, 2001 Al et al... Last weekend I reassembled my Cornwalls (disassembled so I could repaint the flat black in a satin black) and installed Al's crossovers. I'm not enough of an audiophile to give a detailed review but here's my report. They now sound wonderful and sweet...a couple of years ago I had decided either they had become too harsh or my ears had aged since I got them in the late 70's. As I aged I started listening to music more and more on my old Stax headphones and stopped using speakers. I had looked around and found B&W made a nice line of speakers and I'd get a pair...never got it done. Now the cornwall's "harshness" is gone and the speakers sound "airy" and "unstrained". This is with my old Adcom solid state separates...I've yet to bring my ebayed McIntosh separates up. Thanks Al and everyone who lead me to Al. Best regards...charles Quote Link to comment Share on other sites More sharing options...
edster00 Posted July 27, 2001 Share Posted July 27, 2001 I also have upgraded to the ALK x-overs in my Belles. I had been listening them for a few weeks when I found my K-horns. The difference in the sound is hard for me to describe also, I can say what I think someone else said about the ALKs in another tread...It is as if a veil has been lifted from the music. Everything just seems cleaner/clearer. These x-overs are a great upgrade, certainly worth the $$. I have put my Belles aside for now, as I am enjoying my K-horns. After I dampen the horns and get used to my new sound I will be moving the ALKs into the K-horns. Kudos to Al for producing such a GREAT product! ------------------ Ed W This message has been edited by edster00 on 07-27-2001 at 08:57 AM Quote Link to comment Share on other sites More sharing options...
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