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Butch Adams
04-05-2005, 08:45 PM
I've used the search forums feature but did not find enough information to build an exact reproduction of a B460. Can anyone help with detailed information?
Has any member tried to reproduce one? Does anyone know if the original design can be improved on. I'm planning to use a 2242H in this project, is this speaker the best choice for the application?
Thanks for your help.

pmakres1
04-05-2005, 09:05 PM
Hi Butch,

I've yet to see plans for an exact replica of the B460. Speaking for myself, (I've owned my B460 about 3 years) I can't imagine the design being much better, though some of the other esteemed forum members may not agree... I can tell you that the B460, in conjunction with the BX63 crossover and a quality amplifier with ample power, will provide tremendously deep, clean, powerful bass. (See my thread "weighing in on a few issues, L220 and B460"). I do know that the B460 uses the 2245H Low frequency driver, which is a professional series driver. I am unsure which one the 2242H is, though I believe I have heard of it. The B460 enclosure is 8 cubic foot in volume, and is ported with three side-firing vents. You can find two specification sheets in the JBL library that describe the B460. Good luck with your project!

Best regards,

Peter

Zilch
04-05-2005, 09:09 PM
I don't think anyone here has developed construction plans for B460.

The box basics are here:

http://www.lansingheritage.org/html/jbl/reference/technical/1983-subs.htm

The original 2245H is a better choice, but 2242H with EQ will work in that same size box:

http://www.jblpro.com/pub/cinema/4645c.pdf

See also:

http://audioheritage.org/vbulletin/showthread.php?t=4238

John
04-05-2005, 09:27 PM
I got one, will try to post some info and pics. :)

Butch Adams
04-06-2005, 05:00 AM
Thanks for everyones input.
John, thanks for taking the time to provide detailed information from your B460.

svollmer
04-06-2005, 05:36 AM
I've built two pairs of subs using 2245H's based on the first link from Zilch's post above to the 1983 Audio magazine article. Both times I built the 12 cubic foot cabinet tuned to 22Hz. For the first pair I was able to find cardboard tubing from a manufacturer equal in diameter to what's required in the article for the ports. For the second pair, I wasn't able to find the round tubes again, so I made the ports square, out of 3/4" MDF with the same area as the round tube. I could hear no difference between the two.

The main improvement that anyone can make on a project that sometimes the manufacturer can't afford to do is to use an aweful lot of bracing to tie all the walls of the cabinet together and use very thick walls. I used 1.5" for the front baffles, but I have heard of others using even thicker walls.

Both pairs of my subs were designed to be flush mounted in the walls, so I just sanded the cabinets smooth, rounded the corners, and painted them black. Absolutely in no way are they things of beauty like the B460, but they are sonic equivalents and reach even deeper into the infrasonic notes on recordings. They can be downright spooky, because you hear things occasionally that the studio didn't know about and didn't remove, like HVAC systems starting, singers gently bumping a mic stand, etc. These things are so low that most studio monitors wouldn't reproduce them.

I haven't listened to all the subs out there, or even most of them, but I have heard some very expensive subs and I think the JBL design using the 2245H bettered all of them in tightness, "quickness", and sheer low frequency power.

Good luck on your project. Once you have that kind of low end, there's no going back. I think you'll love it. And if you come up with the plans to replicate the B460, please let us all know and show us some pictures!!

Steve

spkrman57
04-06-2005, 06:20 AM
Not a B460 enclosure, but a good thread comparing the 2242/2245 in similiar situations. I myself have a 2242 in that cabinet size and have only installed the driver in cabinet and played straight to get the sonic signature so far.

This weekend I plan to incorporate it in my system with a sub plate amp.

What I can tell you is that pipe organ music comes alive and gets real scary. I hear more things rattling in my house than I thought were loose.

Check out the thread and you should have many of your questions answered.

regards, Ron

Zilch
04-06-2005, 12:23 PM
Check out the thread and you should have many of your questions answered.Link, please. "Search" ain't findin' it.... :(

spkrman57
04-06-2005, 12:46 PM
http://audioheritage.csdco.com/vbulletin/showthread.php?t=4845&highlight=2245

John
04-06-2005, 06:32 PM
Some pics to start you out.

John
04-06-2005, 06:38 PM
B460

John
04-06-2005, 06:47 PM
B460

John
04-06-2005, 06:55 PM
B460

4313B
04-06-2005, 06:59 PM
D'oh!

Bath time for that cat before it licks all that fiberglass off! :p

It isn't doing what it looks like it's doing is it? :eek:

Nice pictures John! :yes:

John
04-06-2005, 07:02 PM
B460.

John
04-06-2005, 07:09 PM
He took a quick peek and he was out of there, he was just doing his job, nobody eats for free:p

By the way all panels are 1" MDF and the base makes up some of the internal volume of cabinet. All bracing is 1"x3" and the ports are 4-1/8" inside dia. and 14-3/4" long. Will try to put togeather some diagrams with measurments and locations of braces. and ports and stuff.

4313B
04-06-2005, 07:15 PM
Will try to put togeather some diagrams with measurments and locations of braces. and ports and stuff.Awesome! :applaud:

Butch Adams
04-06-2005, 07:38 PM
Very clever of them, the base and front angle portion is included in the total interior volume. In the original literature JBL indicated the unit could be placed on its side. Is the bottom finished also?

Butch Adams
04-09-2005, 06:18 PM
Very clever of them, the base and front angle portion is included in the total interior volume. In the original literature JBL indicated the unit could be placed on its side. Is the bottom finished also?

John, I forgot to mention, great pics. http://audioheritage.org/vbulletin/images/smilies/biggrin.gif

I found a local source for the 1" MDF today and should be able to start laying out the cuts as soon as you can post the measurements.

Thanks Again. http://audioheritage.org/vbulletin/images/smilies/applaud.gif

John
04-10-2005, 04:04 AM
When I get back from Atlanta next weekend I will get some Info posted for the B460:D

Butch Adams
08-01-2005, 07:29 PM
John are you still in Atlanta?

Don Mascali
08-02-2005, 06:52 AM
That is truly a thing of great beauty. Thank you for sharing the pics.:applaud:

John
11-09-2005, 09:44 PM
B460 foilcal

John
11-09-2005, 10:10 PM
Some side shots.

morbo!
11-09-2005, 10:41 PM
WoW Some really nice work!
me thinks i need some wood working skills now!
im about to hack up a set of cab`s and mod`em for me k`s
but i would be ashamed to post a pic of em now!

JBL 4645
09-25-2007, 02:16 PM
Oh those pictures of the JBL B460 are miraculous :applaud: more please more pictures. By the way wants the length and diameter of the ports?

hjames
09-25-2007, 03:00 PM
Don't miss the Product Design Brief by John Eargle! (thanks Giskard!)

http://audioheritage.org/vbulletin/showthread.php?t=4557

I liked this part (talking about using the bx63):
"Typically, a dual 150-Watt stereo amplified, driven in the bridged mode, will deliver comfortable peaks of 600 watts"

John
09-25-2007, 03:17 PM
By the way wants the length and diameter of the ports?

Go back up the thread, it's all there.;)

JBL 4645
09-25-2007, 03:27 PM
Heather

That was neat bet of reading short and to the point thanks :)while reading it I was looking up JBL BX63 and stumbled onto this site while looking though Google image.

http://www4.ocn.ne.jp/~audio/usedsp.html (http://www4.ocn.ne.jp/~audio/usedsp.html)

mbottz
12-18-2008, 04:55 PM
http://www.audioheritage.org/vbulletin/showthread.php?t=7877&highlight=b460&page=2

Here they are.

mb