JohnA

Well, Andy, I do look for speakers tested by Mr. Bradford (I think all of mine have his name on them), but for us outsiders the serial number pretty well tells what drivers and components are inside. It's all we have to go on. Generally, I look for 1980 (after March) to 1982 (early) because I like the K-55-V and the solder terminal -Vs went into production after 3/24/1980. I really can't hear any difference between the 2 types of -Vs, at least on the music I listen to, but I know one is a little better than the other. The same applies to the tweeters. Sometime around 1977 the K-77-M went into production. I try to buy them, but the AlNiCo K-77 is not a bad tweeter. I'm still fuzzy on the dates, but aparently about 1990 the K-400 became a K-401. Using the serial number and date, we can tell what components a speaker should have and whether it's been modified. I've found an ad for a pair of unfinished birch Heresies with a "Y" serial number that is listed with K-77 tweeters and 1.5" K-55-V squawkers. That's 2 or 3 errors. The '83 La Scala/K-horn/Belle had K-55-Ms and K-77-Ms. I always thought the Heresy changed to a K-52-K in 1982 like the other big Klipsch. The cabinets are supposed to be pristine and would be perfect to stain to match my La Scalas for a center channel. Now, if the drivers match, I'm gonna pop for them. I've attached a Word file with the serial number in it. I believe this is the one made by Trey. Save it and delete the ".jpg" off of the end to view it.

Popping is usually the driver being driven with too much power causing the voice coil to hit the back of the magnet structure. Initially, clipping sounds like a hardening of the sound and it will often sound brighter because the squared off waves have lots of HF content. Heavy clipping will begin to sound like the rhythm guitar in Van Halen's "Running with the Devil". He uses a square wave generating distortion box in that song. In car audio, clipping is always accompanied by tremendous harmonic distortion, so the "farting" description is perhaps correct.

A Cornwall will vary from a low of about 3.8 ohms in the bass (the woofer is 4 ohms nominal) to around 60 in the midrange to 10 or so in the tweeter's range. The ALK xovers will be nearly a constant 4 ohms, except for the woofer's resonance.

Andy, Check your math. The decoder I use was prepared by Trey at Klipsch for his reference and released into the wild a year, or so ago.

Does anyone have schematics of the Type B and B2 networks? TIA,

Originally, Al had K-55-Ms in his Belles and used that to design and test the crossovers. The K-55-V is a direct swap for the -M with no changes required. In my La Scalas, the transition from the bass horn to the mid horn became completely undetectible with the ALK crossovers. Instruments were more easily recognizable and the bass was louder. Initially, my ALKs replaced Type AL networks in one pair of my La Scalas; the other pair have modified Type AAs (upgraded caps). Compared to the modified AAs, the ALKs have hotter tweeters. The difference is more in the range of flavor, rather than a jump out in your face difference. When tested in a "specialized" anechoic chamber, the ALKs were remarkably flat in frequency response. I highly recommend the ALKs. Go to the web site and you can see other user comments.

The secret decoder ring shows Y = 1983. Remove the backs and look at the drivers. You'll have K-77-M tweeters, but MAY still have the K-55-V AlNiCo squawker. It will be rounded and gray. The K-77-M is a better tweeter than the AlNiCo K-77. They are a direct swap if you want to change them and I have a pair of K-77s for trade.

Thanks djk, I thought you might know something about it. They will be used for portable PA use. I'm repainting the cabinets now, so they will look decent. John

The bars are black, meaning no phosphors are lit. You cannot burn the screen/tube where it is not lit.

This woofer looks like a E-V SP-12-something to me. Is it? It is in a pair of HIPs I bought. The crossover network is a Type AA with the values adjusted for the 700 Hz crossover of the squawker horn (8 uF instead of 13, woofer inductor in unknown). That means the horns are run at 104 dB! How can this little woofer keep up? They are pretty hot, but still have some bass. What technical specs can you provide? Klipsch says a recone *should* be possible, if one ever needs it. http://forums.klipsch.com/idealbb/files/K-42-EV.jpg

The pro gear doesn't use the same serial number scheme the home speakers do and the records for the pro stuff were not as well preserved. It is generally not possible to tell the year from the serial number. Your La Scalas are really LSI-Bs (I think B is the 2 piece) the "industrial" La Scala. They should have K-43 woofers, K-55-V or -M squawkers and K-77-M tweters. The squawker type and tweeter type can narrow the year of production. The crossover should be a Type AA or Type AL, most likely. John

I think the quote shows he doesn't know his stuff. The Atlas driver is still available and is, in fact, used in the 2002 Klipsch Heritage line. Atlas rates the driver down to 80 Hz with the proper horn and it's only 5 dB down at 300 Hz. It was crossed over as low as 400 and as high as 700, but not at 450. His business is run out of a bedroom. My brother called to get a replacement driver for an AR and since he works in Nashville, wanted to pick it up. He couldn't, yhe guy has no storefront and wouldn't let him come to his house.

I'm not following what you are asking. KP-201s are commercial HIIs, rated at 97 dB/watt. Placed in the 4 corners of the typical class room, 2 watts each should average 100 dB, give or take, all through the room. That's loud enough to cause hearing damage. What are you using to drive them and how big is the room? Have you tested them to see if all of the drivers are functioning? Heresies will not pound the room with bass. They cannot go deep enough.

Set the receiver's crossover to the sub about 20 Hz higher than the claimed low end of the RB-5s (50 + 20 = 70?), and each other speaker individually. Set the sub's controls to the highest frequency it will go to. I certainly HOPE your receiver can select frequencies.

There are NO surrounds that match the KLF-series. At the time, Klipsch recommended the KSP-S6. It was not a match, but it was the best they had.

Justin, I can guess you're tired of Doctors about now, but you can't keep putting off going to see one when such abnormal things are happening. Go! On another subject, I'm pretty sensitive to drugs like valium, codine, Mepergan, etc., so I usually check a book, the Phamacist or the internet about most of the drugs a doctor gives me, including the dosage. You should also. Most Drs. won't make a mistake on purpose, but still make some.

I can't see pictures or links to anything! Where are the pictures of Klipschorn Cretin's setup?

I use the Titanic Soundtrack; it has 22 Hz bass notes and mostly acoustic instruments, impeccably recorded, plus Celine Dion. I also use any of several Loreena McKennitt CDs. They are also mostly acoustic instruments, well recorded and she has a wonderful voice.

It appears to be an early Jubilee basshorn with a modified K-horn top on it. I have seen a similar system in a early HPS-4000 web article.

Well ... One half of 8 ohms is not 16 ohms. HIs dip below 8 ohms in the bass. I'll have to measure mine when I get back home. The RP-3 could be ANYTHING, but since the woofer is powered, it will have an 8 ohm loading resistor or it will be very high resistance (the power amp doesn't need power from the input). The best you can do is measure the DC resistance of each speaker system and then apply the formula, 1/a + 1/b = 1/combined.

"John, Lets see YOUR test results and methodology." "Uh, John, they were your standards..." I'm afraid not. You dropped the challenge. Prove break-in occurs and supply test results and methodology.

Paypal is a ***** to get your money from, too. It costs $1.50 to get a check cut, but they will only send one to a street adddress and only the street address your VISA goes to. My VISA goes to a P.O. Box, so I couldn't get a check. I closed my account. I don't use them anymore.

Supply yours. Meet your standards. Prove it exists.

Looks like a Jubilee bass bin to me with a K-horn top. I didn't know it was 10 years old, though.

Dr Bill, You should hear my brother whine about the Forums! That wasn't harsh. I think your point is valid to a "point". The walls and floor do not continue expanding at an exponential rate (or at conical rates that approximates an exponential rate like the K-horn bass unit does) and so may not provide the needed loading to get below 40 Hz or so. Mr. Paul's design for false corners were only 4 feet from the apex of the corner to the outer edge. By saying this was enough, he implied that only the first 4 feet or so was effective.