ajsons

Chris, I mailed the "new" K plans this a.m. Armando

Dean, What material do you use for the mounting base?

And re-post the pictures, por favor. We've seen the driver, we like to see the real deal.

D-Man, Dr. Edgar's 50hz horn, the Show horn, is much smaller than the Classic. Maybe someone can follow his design approach and downsize the Classic, and still maintain it a 50hz horn. Am I making sense? What did he do that is different?

The good doctor (Edgar) says the same thing, 50hz.

I did my own calculations of the Classic's flare. The section after the throat is about 31 hz expansion rate, then expands rapidly as it exits the mouth. I got lost in the expansion at the mouth area. Abe Cohen says in his book to use a 40hz theoretical cutoff to design a 50hz horn. My guess is that he used a multi-flare design for the classic, using 31 hz as the initial expansion. I might be wrong. Q-man says the classic goes down to somewhere in the 40's. Did Cohen use 31hz cutoff for a 40hz horn? I don't know. Q-man, I got my classic from e-bay. $30.00. 422 miles away from Va Beach. Tnx for the Dean plans you sent me. Going back to the subject of this thread, here's the last of the cutting plans for the sub-assembly. I have extra sets of plans for the new K, bass bin and all, but not the crossover. If anyone is interested, shoot me an e-mail. No charge for copying, just send me some stamps. Armando

The Classic needs some heavy bracings, in the doghouse and in the duct. There is too much panel vibration due to the amount of bass output. But it is clean and the bass notes distinct. This is the side fill-in.

The mid and tweeter board

This is the lower section where the crossover is mounted. I have not seen an actual picture of it, maybe Chris has taken a photo. Chris, Are you using the image button to insert your pictures? Try File Attachment and Browse.

D-Man, I built my K-clones with 6 x 13 throats. They really put out very good bass but not like my University Classic. There's no contest. I think that's where my disappointment with them comes from. I always thought that maybe if I put a tailboard on them, the response would be better. I've never thought of the tailboard as a 180 degree reflector. I think you're right. I'll try to post a couple of pictures again.

D-Man, This is my drawing (not Speakerlab's) of the front sub-assembly. The lower section holds the crossover. There seems to be more parts than is necessary. The rectangular piece looks like just a fill-in. What do you think about making an MTM arrangement? Bill Fitzmaurice did it in one of his horns and got very good results. The cutting plans are coming up shortly.

Driver Info

Let me try again.

I'm sorry for the size of the picture. A sub-assembly, or additional enclosure 3" deep is attached to the front of the bass bin, and houses a 7" cone midrange driver (Audax???) and a t-35-like tweeter. The crossover is at the lower half of this subassembly. The bass bin is the same as the first clone Speakerlab made except the sides are chopped off making the bass bin only 23" wide. Also it has no tailboard. The bass response, as one might expect, is a little disappointing. (I built a pair of the bass section, with EV components (EVM-15L, 1824 mid, SM120 horn and T-35. My University Classic performs much better in the low end!!). I'll post the sub-assembly plans and driver info when I figure out how to reduce the size. Somebody please tell me how.

This is the Speakerlab khorn clone later model, or the "New K".

It uses a University 6200 (12") woofer, JBL P8RX mid and University 4401 tweeter. Dr. Edgar gave me a copy of the enclosure plans years ago. Here's the first page.