Good2BHome

From the physical stand point is the K-401 a direct "drop-in" for the K-400 in a LaScala? Mike

I saw this a few days ago for the first time, but I don't understand the way they select the items or sellers. On identical items this approach was not used. The sellers other items were not. SO ????

I'll respectfully challenge the above. About 18 months ago while removing a K-55 driver from its K600 horn, I noticed that the rubber washer was restricting the K600 throat and was dry and a little brittle. I checked my other 5 Cornwalls and found the same (1974's and 1980's). I ordered 10 new gaskets from Klipsch @ $1 each ( minimum order was $10 ). What I received does not restrict the throat. In a personal conversation with the inventor of the "P-Trap", I recounted this discovery, at a fellow forum members home one afternoon. His comment was that the throat should not be restricted. Opinion only: I assume PWK had the K600 built to his specs and would not have relied on a washer to do the job, which the horn was designed to do. Mike

ka7niq, Your 9kHz spike can be corrected with an addition to the crossovers of a "P-Trap" circuit (a rather simple circuit). I've used it and it works. Do a search on "P-Trap" and you will find multiple threads in Updates and Modifications . This was / is a problem with a percentage of all the push-on connector K-55's from their introduction. In the spring of 1980, a K-55 with a new phase plug was introduced with solder connectors. The new phase plug corrected the problem. Mike

Colin, What year were the Cornwalls and did they have push or solder K-55's ? Thanks, Mike

Thank you all for your input ! I'm in the market for one (1) solder lug K-55. The information and data will keep me out of trouble and make it eaiser to sell the one (1) push-on K-55 I have. Mike

Thanks Dean! [] Was there ever a point in time that the Atlas K-55 was 8 ohms ? Mike

Were the K-55V's mids in the period 1970 to 1981 8 ohms or 16 ohms? Mike

Use the Minwax. It works fine. Mike

This site provides the info step by step in pictures. http://www3.sympatico.ca/bonaz/Klipsch/K77-diaphram/K77-diaphram.htm Mike

They went for cheap. I sure hope someone here got them.

The Cornwall's are 1965's MLW

KG, A suggestion start a new thread asking for help. Maybe "Cornwalls Located in Abilene, KS: Need Help with Pickup"? You get the idea. Caveat: I ask the seller for pictures of the interiors (for future reference), but the seller declined to take pictures of the interiors, with the following reply: "The backs have never been off these speakers and I am not going to remove them...Sorry you will just havve to trust me.....greg" (a) The seller does not state that he is the original owner, ( they appear to be in an antique shop, i.e. he is reselling them © and most important: he never uses the word "Cornwall" in the listing. All of this gives me little confidence that he knows much about what he has. That can be an advantage, if you can see what you are getting before money changes hands. If these have the Jensen woofers in them they are worth more, but we don't know that or for that matter if the other drivers are original. IMHO if these go for $700 - $800 + reasonable shipping they're a bargain just because they are CWO Verticals. If they are all original drivers with Jensen woofers $1,600 or less is a bargain. Note: I don't post much, but have been around for quite awhile. I find you learn more by listening than talking. Good luck. If you get them I sure would love pictures of the interiors for my collection. MLW

I recommend that you look at this thread: http://forums.klipsch.com/forums/thread/194174.aspx and the comments of HDBRbuilder who worked for Klipsch building speakers. Last I know of, Andy was in Iraq with his uint. Mike

IMHO 1) Two undiluted coats if they have not been oiled recently, otherwise one coat per year. 2) I use panty hose to apply the BLO. It will leave no residue as the fine steelwool or cotton from the flannel will. It's any old wood working trick, which I use with any wipe on finish that does not interact with nylon. 3) I use thin plastic spacers. Mike

cubdog, Congratulations! Are they Verticals or Horizontals? What year are they? Mike

Your wife understands you to a depth in your very soul, that should scare the hell out of you, in my professional opinion, otherwise you would not still have what you have pictured. Get on you knees every night and thank your higher power, she is there that day!!

Ron, Thanks for that graph! I've been curious about the B-2 for some time. The graph seals it. Thanks, Mike

Lee, After a little additional research, Klipsch released the updated B-2 crossover for your configuration on approximately June 1, 1981. This announcement was made in a Klipsch publication known as "Dope from Hope", Vol. 20 No. 1, dated June 1, 1981, titled "Crossover Network Changed: Cornwall" This is a well known publication on this Forum. AND After looking at your picture with some graphic software, that is exactly what you have: a "B-2T". The 2 was not stamped as clearly as the T. What does the "T' signify? I don't know other than possibly standing for "test". I also went back into my archives and found a picture of the other B-2T and visually they are the same. Below is the text of the "Dope from Hope" release: <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> CROSSOVER NETWORK CHANGED: CORNWALL NEW DEVELOPMENT The productevaluation program at KLIPSCH and Associates constitutes the lions share of our Research and Development effort. We are now gratified to add another entry to the long list of performance improvements made in our product line over the years. Advances in the stateoftheart of sound reproduction frequently result from innovation of new techniques of acoustic measurement, the aim being to utilize quantitative tests, which closely corroborate the psychological sensations of the listener. Thus new measurement techniques or bolstered power and convenience of dataconversion bring excitement to the work of design, but always with the sober­ing constraint that new test results carry import only to the degree to which they have psychological significance. That is, the test format must be such that the genuinely most significant acoustic parameters receive the greatest emphasis during design. The latest in a long series of technical papers from KLIPSCH Engineering explains the operation of our unique Anechoic Chamber With Optional Boundaries (AES Preprint 1979), which facilitates deeper scrutiny of loudspeaker response characteristics. The KLIPSCH CORNWALL has taken yet another step in its evolution toward optimum performance. A complete redesign of the crossover network has made possible a significant improvement, which we now happily share with the audio public. Briefly, the new design entails the following: 1) Constriction of the electrical signals received by each driver to the spectral band over which the driver displays optimum characteristics is a salient feature of the design. A) Boosted woofer output is obtained in the 400 Hz to 600 Hz region, combined with a more rapid transition to an attenuating characteristic at frequencies above cutoff. Substantially decreased lowfrequency energy is applied to the midrange driver. Though tremendous improvements are not possible in this regard, intermodulation distortion is somewhat reduced and the possibility of squawker failure is made even more remote. C) Dramatic improvement in the stopband attenuation is provided by the high pass filter associated with the K77M Tweeter. Overall, this means that more energy can be derived from the tweeter above 6 kHz because of reduced currentflow into the tweeter in the midband. Page2 Vol. 20, No. 1 June 1, 1981 2) Studies of the crosscorrelation of woofer and squawker output waveforms have precipitated a substantial increase in coherence near the crossover frequency. A) The attenuation characteristics of the woofer (lowpass) and squawker (highpass) filters are associated with a particular set of phase characteristics; the two are mutually dependent and cannot in general be manipulate individually. The rolloff rate of the woofer filter and the spectral location of the cutoff point of the squawker filter govern the relative phase relationship of their outputs in the crossover band. Only a special set C circumstances will allow optimization of filter phase characteristics without an associated deleterious effect on the amplitude attributes of the filters transfer functions. Driver polarity does not affect the amplitude response of the driver in question, but does in fact greatly affect the steadystate response of the system considered as a whole. In this case, the mechanical location of the sources, the phase characteristics of the electrical filters, and the relative polarity of the drivers are manipulated in a harmonious manner to render the crossoverband response smooth and nonanomalous. Designated the Type B2 Crossover, this new network is aimed at genuine improvements to the overall characteristics of the CORNWALL Loudspeaker System. The effect of this change is approximately June 1, 1981. We plan to make the transition in a smooth manner, hence the early notice. As always, we will maintain stock of Type "B' Networks and adequate repair facilities for CORNWALL owners. Since in general no change in drivers or cabinet is associated with the network, an update from the Type B to the Type B2 will be a relatively simple matter. Owners of older CORNWALLS are encouraged to incorporate uptodate drive components (K33E, K55V with nested phase plug, and K77M) to maximize the benefits derived from use of the B2 Crossover. An update kit (Type B to Type B2) will soon be made available through the KLIPSCH dealer network. DAN BYNUM ENGINEER DB:rh

Lee, There is a "T" stamped after the printed "B" in the picture you supplied. What you have is a "B-T" crossover, not a "B". Klipsch used several different crossovers starting in 1981. The "B-T" may be handwritten on the the serial number labels also, or not. Some of the other post 1980 crossovers were: B-2, B-2T and B-3. What are the serial numbers on your Cornwalls and what drivers are in them? Mike

Jon, 1) Be very careful NOT to put any screws that penetrate the back near the Mid-range!! 2) Some have screwed and glued another piece of 3/4 inch (slightly smaller in dimension than the original) to the backs, with good results. 3) Quick and dirty for those with minimum wood skills: The Mid-range is intended to touch the the back of the inside of the speaker, inorder to stiffen the back. Add 1/8" to 3/16" sheet rubber from a good hardware store, to the inside back of the speaker right where it touches the Mid-range AND be sure you can tighten down the screws. The toothpicks in each of the crew holes is a good way to do this. Mike

You are correct on your driver list. Mike

Paul, The motorboards were all made that way until sometime in 1974, but with a different tweeter and mid-range starting in 1962. Your reference to "sideways" is referred to as Vertical, with the Horizontal model being introduced in 1974. The vertical could be used on its side and there was even a factory riser for the "on the side" position. Although this was not the common use. Because of the tweeter and mid-range in this model the only people that should be interested are people that already have one of this model and this would make a pair (a very rare situation, maybe unique), a collector that has to have one of everything, someone that wants to own the 167th Cornwall (or maybe the 67th Cornwall ever made, but that is another story) or someone that wants a speaker that Paul Klipsch signed. If there is someone willing to pick this up for a member (not me) please speakup, because there are at least two members that have a "matching" unit and one has ask the question in this thread. If you want a Vertical for a center channel ( an excellent idea) the 1966 Cornwall 7E97 the same seller is selling would be the better unit IMHO. Mike

There are a few of you here that this would give you a "matched" pair. I've forgotten who, it has been too long since I've been on the board Item # 190025881382 Mike

Here's a link to JMON's recomendation: http://www.johnfortav.com/index.html Mike