Does anyone here know where I can find build plans for these? I've searched all over but it seems that JBL do not publish plans for any of their enclosures.....is this correct?
Does anyone here know where I can find build plans for these? I've searched all over but it seems that JBL do not publish plans for any of their enclosures
I can help you with the 4507 but don't know what a 4509 is?Originally Posted by Kwikas
Does anyone here know where I can find build plans for these? I've searched all over but it seems that JBL do not publish plans for any of their enclosures
Originally posted by John
Thanks John. The 4507A is the LF section of the JBL 3631 ScreenArray. The 4509 is the LF section of the JBL 3632 ScreenArray.I can help you with the 4507 but don't know what a 4509 is?
http://www.jblpro.com/pages/cinema/scrn_ary.htm
If I can't get the actual JBL plans for these LF enclosures, then I'd settle for plans that someone else (a 3rd party) can provide. I've got the three 3632 MF/HF sections that I need for my HT fronts and now I need to build the three LF cabinets. I'm okay with building either of the LF cabinets....I don't have a prefference.
Appreciate the help.
Dimensions of 4507A seem to be the same as 4507, but the porting and driver location are different, apparently.... :dont-know
The 4507, as you know, has 4 port holes and supporting brace from baffle to rear panel.
Ron
http://www.jblpro.com/pub/cinema/3632.pdf
Try this.
looks like 30w x 34.75h x 17.75d
also, looks like they are using MI-15's crossed over at 350Hz.
Probably tuned to 40 hz.
You could use 2 - 2220's instead, or 2225's
Also check out a 4508 cabinet. Been around a LONG time and for same general purpose. Same as an EN-8 home kit hi-fi cabinet from my youth.
Scott.
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC² ±3db
Yup, and plenty of room to cut in a horn of choice....
Thanks SMK. What thickness of wood is used for these? I should be able to construct them off the dimensions you've posted. I would need some advice from you guys around internal bracing though (I've never built cabs before).Originally posted by SMKSoundPro
looks like 30w x 34.75h x 17.75d
Yes, that's what I want........Originally posted by SMK
Probably tuned to 40 hz.
Okay JBL, so this is fundamentally a 4507 cabinet with the ports moved...Originally posted by JBL
The 4507, as you know, has 4 port holes and supporting brace from baffle to rear panel.
I'm assuming I can build the boxes by working with the outside dimensions of the cab.....but,what thickness of timber should I use and how do I know how much internal bracing to use (and where to put it)? Also, the bracing volumes must be taken into account when building the cabs - right?
It seems I can use a 4507, 4508 or 4509.......given that I've never built these before, do any of you guys have suggestions on which one would be the easiest to build for a first timer?
I'm going to need some help here I think.
Thanks
Andrew
Sometime this weekend I will get you the dimensions and thickness.
From memory I will say 3/4" for everything.
Also the ports are 3" I.D.
But to be sure give me a few days to dig one out, got quite a pile!!!
1" sides and top and bottom.
3/4" baffle and back
3" ports about 4" duct length
1x3 bracing 2 on each side back to baf
1x3 from back center to baffle center.
I'll send some pix.
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC² ±3db
John , thanks and much appreciated...Originally posted by John
Sometime this weekend I will get you the dimensions and thickness.
From memory I will say 3/4" for everything.
Also the ports are 3" I.D.
But to be sure give me a few days to dig one out, got quite a pile!!!
Thanks SMK...that's great and certainly explains some things.....Originally posted by SMK
1" sides and top and bottom.
3/4" baffle and back
3" ports about 4" duct length
1x3 bracing 2 on each side back to baf
1x3 from back center to baffle center.
I'll send some pix.
If I go with the 4507A, how would I run the brace between the baffle and the back - given that the speaker is right smack in the middle of the baffle?
Also, is the 3" port and 4" duct length good for all three (4507A, 4508 and 4509) cabs to acheive a 40hz tune?
Andrew
1. Probably won't need a brace there.
2. No. Each cabinet will need to tuned to the right duct length. I feel the cone motion stop moving, note the frequency on the signal generator w/freq counter, then remove and cut some more duct length off. Try again, until I get as close as possible to 40 hz. Not scientific, but works.
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC² ±3db
Okay,
After all things considered, I'll make some 4507A cabinets which I think will be the same as making 4507's but with the speaker and ports centred.......
So, I'll need some plans.
John, if you can find some 4507 plans in your pile it would be much appreciated.
Also, since this is the first speaker build for me, is there some easy reference guide (or similar) I can study which explains the cabinet joints I need to use etc?
Thanks
Andrew.
Nope........no need. I can follow the Backyard Box Building thread.....Also, since this is the first speaker build for me, is there some easy reference guide (or similar) I can study which explains the cabinet joints I need to use etc?
The 4507 is a very well built and dense cabinet. The result is vibration free performance. This result is hearing only the drivers, not the cabinet.
IIRC, JBL cabinets are designed with a 'locking' fit. It's been some time since I last read-up on the subject. It may be a good idea to search the library or look for a "White Paper'" on the subject.
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