capo72

Hi Mark, Put me down for the BBX remote retrofit, and the 6h30 Supertube upgrade. Let me know when your ready and i'll send it in. Thanx! Jeremy

I was going to say the same thing. Maybe you should forget that rectangle tractrix calculator, and concentrate on the round. Very nice work! Jeremy

As an update to all who are interested, I have purchased some equipment to get some frequency response measurements on these horns. I'm still trying to work out the bugs on my measurement rig, and i'll get some charts posted as soon as I figure it out. I've also started working on the direct radiator bass bins for my 18" JBL 2245's. I just received some of Bob Crties' tweeters via Greg Roberts. I will be doing some testing with these as well as some JBL 077 tweets, maybe some JBL 075's also. I think Bob's have a big advantage in that they will reproduce quite a bit lower than the JBL's, and since my mid drivers reproduce down to 300hz, they just don't cover the high end as well. I can't wait to get to the point where I can get all this stuff tested. Unfortunately that may be a little while off as my work has picked up, so between 12 hour work days and taking a couple classes at the local community college, and the kids activities, my time is pretty limited. I will give it my best though! Thanx to those of you who have followed along or helped out along the way. Jeremy

Hey Don, I replied to your PM. Jeremy

If speakerfritz passes on these, I will take them. I am looking for tweeter options for my current project, and these may fit the bill nicely. It would at least be nice to do some A-B testing with them. So, i'm in line. Jeremy

In my neighborhood, you could get 2 houses like JC's , each on an acre, for that price. I'll have to remeber that, and tell myself how good I have it next year when my property taxes top 6.25% Good luck on the sale JC. Man i'm really starting to like where I live! Jeremy

CAO 10th Anniversery Gold CAO Black Anything by Rockey Patel Anything 5 Vegas Jeremy

I believe Wardsweb (Luther) has one. They get good reviews. I'd buy it in a heartbeat for $700. Goodluck. Jeremy

How about some pics? I'm glad this is working out for you! Jeremy

Thanx JC for providing all of that info, you understand it better than I. I just got back from Guitar Center and I looked at that M-Power USB interface that you have Mike. I think it was $99, then they had one with Phantom power and more input and output options for $149. I think that may be the way to go for me. I looked at microphones too but i'm a little confused there as to what I need. Maybe you could give me some suggestions. If I understand right, I can get that USB interface w/phantom power, a mic, and some freeware and i'll be able to get some measurements. This measuring response stuff is all new to me so I may need some direction. I'm more of a "figure out how to build stuff" kind of guy. Thanx for all the help and info and positive feedback so far. Keep it coming! Jeremy

I purchased the MDF from Rockler Woodworking, though it is available from other sources. It was about $16 for a 2'x4' sheet. As I learned the hard way, you have to be very careful cutting it, so the ribs don't break. I would use it again though. I was going to try 1/8" Luan, but some of the scraps I had were just not flexible enough. I spend lots of money with Rockler, so it was a no brainer as I was order some other stuff from them. I think it was $10 to ship it and it showed up in 2 days, can't beat it! Jeremy

If you do decide to part with your 3009 arm board, I could use one. I was planning on making my own when I swap over to the 3009. I'm still using the stock Thorens arm until I finish my plinth then i'm going to mount my 3009. It may be wise to keep it though as Maron pointed out. Jeremy

Looks very interesting. For the initial investment, I don't think you could go wrong. I wasted more money on things far less interesting than these. Like Buckster said, you could easily spend more money on tubes alone. I need to get into some tube amps. My Blueberry has wet my appetite for sure. Jeremy

Thanx Maron, that means alot coming from you. I admire you St. Louie horn guys (Dave, Carl, and yourself) for appreciating JBL and Altec along with Klipsch. I have not talked much about this project here because it is all JBL and I don't know how it will be accepted. I would love to get together with you guys some day. Mike, the main reason for lack of vertical flare is ease of construction. I have given some thought as to how it could with flare in both directions and it would definately be more work, but I think I could do it. As Maron pointed out this is my 1st horn build and i'm pleased with the results. I learned the basic process behind this construction from others here and some on the Lansing Heritage board. I would not have known where to start without others laying the path. I learned alot along the way and feel I could expand from here we'll see where this takes me. I'm not too concerned about the low end output of this horn driver combo. My woofers are plenty capable of playing up to them. I'm more concerned about the upper end of this horn combo not playing up high enough to crossover with my JBL 077 tweeters. I will probably have a large hole in the response there, and I may need to find a different tweeter. Maybe Bob's CT-125. I definately need to get some test equipment to see where I stand. I think it's more about the journey than reaching the destination with DIY speakers. Thanx for the kind words! Jeremy

I don't know what the frequency response is going to look like. I plan on investing in some measuring equipment. Maybe a USB microphone and some software for my laptop. I was thinking about going to the local Guitar Center tomarrow and see if they have anything. My JBL drivers are supposed to reproduce pretty well down to 300 Hz. I plan on crossing over some where in that area. I just wanted to make sure the horns would not cutoff before that. I may go with an active crossover at 1st to get things dialed in, and then see if I can figure out how to design a passive network for them. Jeremy

That wood tone arm could be a Grace. If so you should be able to sell it and recoup a considerable amout of your investment. 3012's are so cool, but out of my price range. I'll stick to my 3009. Man i've got to drop by some time Pete. You sure have some cool stuff. Jeremy

Here they are hooked up and playing some tunes. I put a quickie 300Hz high pass filter on them, and with my subs low pass set at 200 Hz they don't sound too bad. This is just the start of my project spreakers which include JBL 2245 18" woofers, and JBL 077 slot tweeters. I've got a long way to go, but At least i'm finally starting to see and hear some results. Feel free to comment or criticize. I have thick skin []

Here they are sitting on top of my $25 Cornwalls, with another K-600/K-55 for reference.

After adding a plate on the back to mount the driver, it is basically done. The plate is the same height as the mouth, to help the horn sit level, and to support the massive 25 lb. JBL 2482 driver. I will probably add some gussets between the back plate to the top and bottom. A K-600 horn and K-55 are in this pic to give you an idea of how big these are.

Here is the completed horn after pulling it off the fixture. I had no idea how big they were going to be until this point. These are massive.

I ended up using a flush cut hand saw to cut the sides flush, because the router was too aggressive on the ribbed MDF. It was alot more work. This part of the process involved actual blood, sweat, and tears.

Here are the two layers glued and brad nailed to the top and bottom plates. Extra material is left on the sides so they can be flush cut later. I though about putting the two slotted sides together so it would look better, but I thought I would get more gluing surface if I put them front to back. This was a mistake, because as I tried to cut the sides flush with my router, the ribs came flying off and it looks like crap.

Here is the material I used for the curved sides. It is bendible MDF about 1/4" thick. I will laminate two layers of this on each side. I was going to use 3 layers, but scraped a couple pieces along the way, so 2 it is. I think it will be plenty dense enough as is.

Here are the top and bottom mounted in the fixture. I used two screws to screw each side to the buck. Those were the same two holes I used to screw them down to the wedges to sand the angles. These holes will be plugged later.

Those wedges that were scrap from the buck are now used to hold the top and bottom pieces at the correct angle while sanding the edges square. I used an oscillating spindle sander, but i'm sure it could be done other ways.