johnnyp

"...Man, you guys are really freaking out...A person who prefers a "crisper" sound could well prefer the Heresy because of it's tonal balance..." Here, here. I totally agree with TBrennan. I have heard Khorns and Heresy speakers in the same room on the same system. The Heresy speakers will sound "crisper" because the crossover in the Heresy runs the tweeter "hotter" with respect to the other drivers in the heresy than does the Khorn. (Don't you folks remember all the discussion about changing the tweeter filter connections in the Heresy to reduce tweeter output and make it sound more like the other Heritage speakers?). Now, go back and really crank the music. The khorn will boogey when the Heresy starts to shrill. At lower volumes, I prefer the heresy (except for the lack of bass).

From the Speakerlab catalog dated: Oct 01, 1979 Speakerlab W1508S T/S Re = 6.8 ohms Fs = 23.9 Hz Mms = 76.6 Cms = .58 Vas = 612 litres Rms = 5.06 Bl = 14.9 T-m Qms = 2.27 Qes = .354 Qts = .306 Sd = .086 m2 REF SPL = 98.8 dB I would not think a driver with a huge Vas would work well in the small back-chamber horn but what do I know!

homemade, One other thought. Are you running your 6.5 inch Audix HRM17 without any crossover components? If not, one problem you may have is frequency overlap in the ~150Hz - 400Hz region.

"....I located some 6.2mh coils and added them...." ??? I think the drivers you have chosen are fine. Remove your 6.2 mH inductors and install a pair of air coil low-DCR 2.4mH inductors and rerun your frequency/dB test.

"...I've seem some mounted that way, but it requires taking the magnet off and reassembling from the back side..." That's what I do. Easy as pie. Wish I'd vertically mounted them though.

Unsure of what a "burn-in" CD is? I have used several 15" accordian-style surround woofers (K-33, McCauley, Eminence, Dayton) in the last 10 years. After 20 hours of play, they all sounded "fuller" than they did during the first hour of play. Now, my woofer break-in procedure includes 40 hertz for 2 hours at a modest volume. Have not noticed a "break-in" effect for any other size or type (compression, rubber/foam surround) of speaker. I am less familiar with "burn-in" of electronics because it has been so long since I've had a new piece of equipment. I generally believe electronics sound better after they've been "on" for a while. However, a "burn-in" CD seems ridiculous to me. Just enjoy the music now and know that can only sound better in the future. At least until the speaker/electronics materials or magnet strength begins to break down.

"There is one born every minute." Wait! It looks like there were 2 born at 7:06 PM!

Al, The graph you posted in the first note suggests the K-55-V compression driver was used on all 3 horns (Trachorn vs. K-400 vs. 511b)? They all look pretty close with the Trachorn having a slightly smoother response. Would not a 4" conventional driver simplify your horn and eliminate the need for the complex adapter section and the costly compression driver? What does the Trachorn response look like with a 4" conventional driver? Which 4" driver to use? I think you might generate more interest if you can show a graph of the K-400 K-55v vs. Trachorn with a 4" driver.

I haven't used a phonograph for almost 20 years but when I did I tried a bunch of the cartridges mentioned on this thread. After several years (and spending more money than I care to confess), a friend whom I trusted told me to try a a Stanton 881S. Tightest bass and most natural treble I ever heard from a cartridge. I think it still might be available for just less than $150: Stanton 881s MkII

Gil, You can also find speaker gaskets here: http://www.isesurplus.com/740.htm No pics but pretty good descriptions (15's near the bottom). I have not done business with this company. It looks like they do have a minimum order. I think PWK said the volume of air between the diaphragm and the slot was critical. As one who has tried spacers on the motor board, keep the spacer/gasket as small as possible; just thick enough to prevent collisions.

Captn Bob, I am impressed with your MacGyver-like method of speaker testing! Tell me more about where you had your T-35 re-magnetized. Who did it and how much did it cost? Was it a ceramic T-35 or Alnico? What do you think caused one to lose magnetism? Makes me wonder about my T-35's and my K-55v's.

I doubt very much Klipsch tests every Khorn fabricated to verify backchamber airtightness. I don't even know if they test any production samples. Please keep in mind that "airtight" is not the same as "pressure-tested to 10-125 PSI" which is closer to what you are doing. Also, I believe none of the motorboards in Khorns are sealed in place over the slot. The motorboard is designed to be removeable but it should installed "airtight". The woofer is sealed to the motorboard and is installed over the slot as an assembly unit.

"You can contact Image Communications at 1-800-552-1639 ext. 4242 and ask for Sandy." I found the statement above in an old audio text file on my PC. Don't know where I copied it from. I called the number tonight and DJK is correct; Image has consolidated with another company. The phone answers under the new name but they may still provide Beyma support/products.

Did the seller use/test the amp in the states with a variable power supply/ voltage converter? U.S. power generally varies between 110V - 125V depending on location. But I don't know if it's safe to plug made-for-Japan electronics directly into American outlets.

Pro amps are designed to withstand frequent transportation abuses and to be driven near their thermal and electrical limits. I had a BGW 750 Series amp that delivered the best bass I've ever heard on a home stereo system. A friend gladly traded his Crown DC-300 for a BGW 750. The downside is their cooling fans are excessively noisey. They can be had for a song on eBay. Delivery may be expensive as they weigh about 70 lbs. However, I've heard some other models of BGW amps and not been impressed.

It already been said that there is no reason a K-400 could not be cast in brass. If klipsch were still using the cast metal K-400, the only difference would the huge cost difference in the price of brass vs. AL. But since klipsch no longer uses cast metal K-400's, the pattern for the brass horn is a problem. It will be a tremendous pain you-know-where to develop an accurate K-400 pattern replica. Klipsch probably buys their new lexan K-401 from an vendor who specializes in injection molded lexan products. Contact them to mold you several K-401's in wax. Then you can have your horns cast in brass using the lost-wax or precision molding process. The advantage is better finish and no mold lines inside the horn flare!

JJJeffries (Craig): I, too, have considered purchasing the little Monarchy amp. Having not heard it, my only comment is please note that it comes in a "Pro" version too. That's the model I'd be interested in owning.

Gil, ...."The bottom line is that we're better having a pressure chamber formed in front of the diaphragm where there is some uniformity of the pressure squeezed out the slot. In the up-down direction, it looks more like a point source...." I wish you had written some of my text books. Uniformity of the pressure wave through the slot and into the throat must be important. The pressure wave is generated by a round, concave (from the slot's perspective), oscillating diaphragm. Because of the concave shape, the distance from the diaphragm to the slot is variable. At the slot extremes, the diaphragm is closer to the slot. Does this mean the sound passes through the slot at the extremes first? I've wondered for a long time if another slot configuration, instead of a rectangular one, would provide a more uniform pressure wave into the throat? Do you think a lemniscate or "butterfly-shaped" slot (dimensions unknown) could more uniformly load the throat?

---------------- On 4/12/2004 12:32:28 PM Al Klappenberger wrote: Greg, ...The A will sound crisper than the AA becasue it has less loss then the AA to the tweeter. About 3 dB less. The A will not protect the tweeter from low frequency energy. This can cause distortion at high levels.... Al K. ---------------- I absolutely agree. As wonderful as the "A" sounds at low volume, the tweeter distortion it produces is noticeable at a moderate to loud volume. If you have A-A crossovers, stick with them. And then try the A-A tweeter circuit modification discussed in detail in the "ODDS and MODS" forum titled: "More extended highs for AA network" I think you like that too.

Gil, Here are the T/S parameters of the 15" Speakerlab woofer as published in their catalogue: Model: W1508S Maker: Speakerlab Date: 10/01/1979 Sd: .086 Re: 6.8 ohms Fs: 23.9 Hz Fs/Qts: 78.0 Hz Vas: 21.6 cubic ft Mms: 76.6 Cms: .58 Rms: 5.06 Bl: 14.9 T-m Qms: 2.27 Qes: .354 Qts: .306 Ref SPL 98.8 dB Miles apart different from the K33. I never owned a pair but the worst thing about the Speaklerlab knockoff was the crossover. What was the difference between the Speakerlab K and the SK?

Ray, as long as we're burning bandwidth for OT, how about posting the lyrics to "Rawhide"? 1) CSI: Miami 2) The Lone Ranger 3) Rawhide 4) The Secret Agent 5) Mission Impossible 6) Bonanza 7) Rockford Files 8) Wild Wild West 9) Combat (where are the re-runs?) 10) The Avengers

Silver-plated over pure copper 1/4" spade: http://www.thecablepro.com/cableDetail.php?cID=36&cgID=1 (I am not afilliated with the vendor in the link above nor have I used this spade yet.)

Beautiful work as usual, JH! I think those JBLs are rated ruler flat in a small box from 200 to 6K at 101dB. A pair in parallel would be 104dB, correct? Do they emulate the dynamics and clarity of a drum, a gun shot, etc, like a horn does? I guess it doesn't matter, I don't see any more available in the tent.

What makes you think you're AA networks might be defective? Because you're woofers were blown? I think the K-33e woofers are conservatively rated to 100 watts rms. Inspect your AA balancing networks for leaking capacitors (a visual check) or indications that the networks have been modified. If you don't see anything unusual, I doubt there is anything wrong with them. My AA networks are about 40 years old and there's nothing wrong with them.

Welcome to the Klipsch forum, littlebigjoeman. Now mellow out a little - no one attacked you or your Mac gear. Most here think Mac gear is top notch. We're just surprised you think the Khorn needs an equalizer. For several years of production the Khorn and the Cornwall used the same squawker drivers. If you remove the back cover of your Cornwall and the squawker driver looks like the squawker driver on your Khorn, go ahead and swap one for the other (just unscrew 'em). If the bad midrange sound moves to your Khorn, you have isolated the problem to the driver.