Tweeters old and new

[John W]

I’m a big fan of the 60’s mid century designs put out by JBL. Having grabbed some good pictures of the C41 Angelus off an auction, I decided to have a go at reproducing my own.

http://www.lansingheritage.org/html/jbl/specs/home-speakers/1960-c41.htm

I scaled up some measurements from the photos and basically arrived at a box: 5 3/4 h, 14 w, and 4 7/8 deep. The tricky part is the pushed in face, which I have at about 9/16 inches in at the center. I used ½ inch 9 ply plywood for the housing, covered in walnut veneer left over from some previous projects.

The little feet are 1 inch high and I tapered them myself on a wood lathe starting with ½ in round aluminum rod.

The crossover is an N7000 I rebuilt with all new caps, coils and l-pads.

[John W]

I finally bought a pair of 2407H drivers to incorporate into an existing system. The goal was to turn a small tweeter horn with the same outside diameter as the existing ring radiators so I could swap them right in.
I worked up an oblate spheroidal waveguide contour using Hornresp.

The 2407H has a standard screw mount for a 1 inch driver. The actual diameter of the throat is only 7/8 so I used this as the horn throat.
I couldn’t come up with a source for a female threaded insert, so this pair is held in place with the aluminum straps in the pictures. They are quite secure and I used the straps to mount some push connectors.

They sound great. I haven’t taken any measurements other than plugging them in to the existing crossover, which has them coming in at about 10k. I was able to get them out fairly flat to somewhere past 20k without much equalization.

[speakerdave]

Just lovely, John! Really nice.

David

[Steve Schell]

Fantastic work, John W. Did you make the table also?

[John W]

Fantastic work, John W. Did you make the table also?
Thanks,
Yes I made this a number of years ago, it's more of a bench really. My wife liked it better when my hobby was small pieces of furniture. Whatever.:blah:

[soundboy]

From a neighbor in Oregon....gorgeous work. Someday.....when my youngest is older, I want to get in the woodshop again like the old days....and produce some artwork with the beautiful JBL drivers. Unforunately, the really nice stuff is getting to be a small fortune because of ebay.
Love your posts and photos....keep us posted on any and all future projects..Pete

[pablol]

I just picked up some of these drivers, wish I had a wood lathe. :) Unfortuantly mine are going in back of a Eminence 10cx. Great work, I really like the C41 Angelus, I might have to look into some of 'em. I'm a sucker for the retro look :D
Pablol

[macaroonie]

J B Lovely:D

[00Robin]

absolutely nummy.

[UreiCollector]

my god those horns 'turned' out nice!

[Ian Mackenzie]

Fantastic!

[Robh3606]

Very nice looking horns!

Rob:)

[jblwolf]

John,could you make me a pair of cabinets for the 075's?

[John W]

John,could you make me a pair of cabinets for the 075's?

The pictures and description are meant to encourage you to acquire a few tools, build some skills and try it yourself.

Still, I may build another pair or two after I finish a few other things. These will probably go to auction since it’s easier for me than trying to come up with an equitable price.

[MartinV56]

Very nice looking horns, Congratulations

[4313B]

Outstanding as usual. :)

[scott fitlin]

That looks great!

:bouncy:

[sourceoneaudio]

Absolutely incredible!!!!!!!! John, you are truly an artist.

:jawdrop:

[Thom]

I'm envious of your skill.

[timc]

Very nice work as always :applaud:

[pos]

Hi John,

How do you like your 2407+horn compared to the 2403 you had before?

[John W]

I am really happy with the 2407/horn combo. The performance is wonderful and I don't think I would switch back. It's a little hard to describe tweeters from 8k up as being smooth, but these have all the detail and twinkle but are a little less edgy.

[pos]

How much eq did you add on top to get a flat response?

You really did a wonderful job. I keep drooling when looking at your productions (1200/900hz smith horns, H9800 and speaker, ...). This is all VERY impressive to say the least.

[John W]

How much eq did you add on top to get a flat response?

I checked the eq on the digital crossover. I have a passive network between the upper midrange horn and the tweeters. The original network was for a 2405. It looks like I had to raise these up about 6db to get them even to where these were, a slight rise of about 2 db from 8 to 12k then flat from there out.

[greyhound]

im truly lost for words. beautifull:applaud:

[pos]

1876 :blink:

http://cgi.ebay.com/Rare-1876-POLLARD-ET-GARNIER-le-condensateur-chantant_W0QQitemZ170177109211QQihZ007QQcategoryZ3 8681QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=26602&stc=1&d=1184947057http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=26603&stc=1&d=1184947065

[demon]

:dont-know

http://www.bttfmovie.com/modules/images/1885/large/1885_doc_b.jpg