John Warren

the 3x13" baffle board slot is a consequence of the k33e woofer. decreasing the slot area increases the shunt capacitance at the throat making the slot/throat combination more effect as a low pass filter. if a "regular" woofer is used the 6x13" slot is needed. the slot attenuates the upper end output to make the low cost (small motor) K-33E woofer sound like its putting out bass. looking between 200 and 400Hz is looking at the the tree tops and missing the contour of the mountain range. Look at the output above 200Hz and compare it to the output at 60Hz and below. 13+db DOWN. The small slot throws away efficiency. This message has been edited by John Warren on 04-20-2002 at 06:47 PM

Stig- the plans that are found in the link you provide are somewhat different than the "original" 1953 Classic. They are factory plans published sometime later. LTV-Altec bought University and moved it from White Plains, NY to Oklahoma City, OK. James Ling, the "L" in LTV, was born and raised in Oklahoma City. For some odd reason he thought that moving Altec (a decidedly West Coast company) and University (White Plains no less!) to OK would be "good" idea. The fact that the engineering staff from each company refused to relocate should have given a clue! When LTV folded, Altec and University were partitioned off and sold to the parent company of Electro-Voice (either Gulton or Telex, can't remember which).

Maybe I can offer some clarification- In 1952 University Loudspeakers developed the horn that Q-man built. It came in two flavors, with and without rear corners. All drivers were identical. The version without the rear corners (the one built by Q, see top view) will fit in a corner BUT it is not a corner horn (the room walls do not make up the final segment of the horn) but corner placement will improve LF output. The "cornered" version could be oriented as either a Lo-boy or Hi-boy. The seperate base (plinth?) accommodated both. I am not aware of any other LF horn system offered by University. The "Classic II" came out in 1963 but it wasn't horn loaded. This message has been edited by John Warren on 04-15-2002 at 12:07 PM

the 3x13" baffle board slot is a consequence of the k33e woofer. decreasing the slot area increases the shunt capacitance at the throat making the slot/throat combination more effect as a low pass filter. if a "regular" woofer is used the 6x13" slot is needed. the slot attenuates the upper end output to make a low cost woofer sound like its putting out bass.

Living steel? Does this have something to do with the "quenching media"?

Q-man was kind enough to send to me assy pictures of his recent University Classic construction project! As you can see the horn looks quite cool. The driver shown is the vintage C15W, a green die-cast frame 15" woofer with 6 lb Alnico magnet, designed specifically for this enclosure. The mid-range horn is the University Cobra-flex with associated University compression drivers. This horn is still sold today by EV as the Cobra-flex II, albeit a PA horn. Horn throat- Horn throat with first "bend"- C15W mounted in compression chamber- Top view looking down on folding geometery- Completed horn with woofer access panel removed- Completed horn- Thanks again Q!

an East Coast Senator? our *beloved* Ted? This message has been edited by John Warren on 04-07-2002 at 07:12 PM

KRboy- It requires a court order to tap your phone. You cannot *make* your own phone legally, they are FCC controlled. No such law is in place to *tap* your computer. The proposed bills (the ones I am aware of) make it a felony to modify computers to monitor the keystrokes of another computer from a remote location. the bills regualate PCs the same way telephones are regulated.

HornEd- From her obit- Unhappy Manhattan Childhood Maria Anna Sofia Cecilia Kalogeropoulos was born Dec. 3, 1923 in Manhattan's Flower and Fifth Avenue Hospitals, her Greek parents had arrived in the United States a few months earlier. Her father was a pharmacist. Years later, in discounting the rumor that she had been born in Brooklyn, Miss Callas said that she remembered living in Upper Manhattan over a drugstore owned by her father. She attended Public School 164 at Wadsworth Avenue and 164th Street in Washington Heights, and by the age of 9 was singing for her schoolmates. Full text can be found here- http://www.nytimes.com/learning/general/onthisday/bday/1202.html Now its my turn!

HornEd--I had Callas ID'ed way back but dropped it because Callas was born in NYC (Manhattan)! This message has been edited by John Warren on 04-06-2002 at 03:06 PM

sensitivity is meaningless if you do not know what the standard of measurement is. it's frequency dependent. comapring speakers you have to compare apples to apples, not just the raw numbers. I do not know how the LLC measures sensitivity. My geuss is that they take 1000Hz / 2.83V /1m on axis. JBL pro for example take it over a broad range and produce a weighted average, a measurement that gives a much better indication of what will be heard.

Thanks for keeping me in mind, looking fwd to seeing them!

t2k-the Klipschorn assy picture is from a pair I built a few years back. They were completed and sold to the person I built them for.

True, but don't tell them that!

What I do for you guys! These are the copies published by Isophon (Germany). I have not made a set from these. They look straightforward to construct. Nothing like a Klipschorn This message has been edited by John Warren on 04-02-2002 at 05:56 PM

djk- I uploaded the plans (Isophon copy) to the LLC server. the plans were on a Word document. Tom- They are in "metric", Schnitt means "view", what else do you need to know? They are high resolution, you can zoom up to C-size and get clear numbers. Also, why get "screwed" on ebay? I just gave you the same plans the ebay scammers are hooking $50 for.

LaScala plans here This message has been edited by John Warren on 04-02-2002 at 05:49 PM

HornEd-That's a riot! I think I would have "liked" Lulu! Some photos in the link below http://www.pandorasbox.com/louisebrooks/galleries/risque.html

I already told you, it's Louise Brooks!

Louise Brooks

Fini- You've described the *work around* alternative to a spray booth. Naptha (a strong solvent used primarily as a degreaser) reduces the solids content of the varnish which gives it some leveling ability. It sounds like you are a real craftsman, getting glass smooth finishes with varnish takes real patience. jw

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Gil-You are confusing the concepts of OIL FINISH and PROTECTIVE FINISH. Oil finish is boiled linseed linseed oil OR tung oil with a thinner of either terpentine or mineral spirits. it's nothing else. Oil finish is NOT thinned out varnish. It does not leave a *protective* film on the surface the way varnish and lacquers do. Varnish is linseed (or tung) oil mixed with resin solids. The resins supply about 50% by volume of solids content. Oil finishes have NO solids content. This is why I mix my own oil finish, I KNOW what is in it (2 parts boiled linseed oil to 1 part terpentine, heat, apply heavy, rub out). $5 will make a 1/2 gallons worth. Alternative to varnish is Lacquer. Lacquer (today) is cotton cellulose disolved in a solvent. It dries faster, but the cost is higher. varnish is tougher (more solids content). Oil finish is easy, anyone can do it. varnish and Lacquer are very difficult and MUST be sprayed on in a booth for *perfect* result. This message has been edited by John Warren on 03-23-2002 at 09:01 AM

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