Sons of JBL:Part 1:18" Version of JBL 4520

  • levyte357
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13 years 8 months ago #12497 by levyte357
Firstly some plans to start off...

[attachment=0:2mo4nppj]<!-- ia0 -->jbl_4520.JPG<!-- ia0 -->[/attachment:2mo4nppj]

\"When in Vegas, do as the vegasians do\".
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13 years 8 months ago #12498 by mykey-
Replied by mykey- on topic Sons of JBL:Part 1:18" Version of JBL 4520
that's much better folding, almost a work of art smiley20

I do remember some members telling me not to bother with awkward angles a few years ago :oops: and to use 45's instead smiley11

now you can see clearly why I never did on most models smiley4

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13 years 8 months ago #12499 by mykey-
Replied by mykey- on topic Sons of JBL:Part 1:18" Version of JBL 4520
halve it, make it 610 wide, whack an 18 in it instead of a 15, you're onto a WINNER smiley20

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13 years 8 months ago #12500 by levyte357
Replied by levyte357 on topic Sons of JBL:Part 1:18" Version of JBL 4520

mykey- wrote: halve it, make it 610 wide, whack an 18 in it instead of a 15, you're onto a WINNER smiley20


Front baffle too small..

I'm guessing angled bit below driver baffle is 60° ?

EDIT:Also Don't know if it's scale of the drawing, but large upright seems bit small.

Pic I use as reference.. smiley14

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13 years 8 months ago #12501 by mykey-
Replied by mykey- on topic Sons of JBL:Part 1:18" Version of JBL 4520
front baffle doesn't have to stop where it is, you can drop it 20/30mm, so a over hang lip smiley2

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13 years 8 months ago #12502 by levyte357
Replied by levyte357 on topic Sons of JBL:Part 1:18" Version of JBL 4520

mykey- wrote: front baffle doesn't have to stop where it is, you can drop it 20/30mm, so a over hang lip smiley2


Would prefer to extend it by 50mm, extend large angled upright by 50mm also. smiley16

Not too happy about rear baffle length, opposite throat section anyway.

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13 years 8 months ago #12503 by bitzo
Replied by bitzo on topic Sons of JBL:Part 1:18" Version of JBL 4520
so A style for upright corner brace and B style for upleft one? and always 45 degree mitre?

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13 years 8 months ago #12504 by saul
you gotta remember a fane and a PD 18" chassis are only 460mm accross the flats.

ive built boxes with less than 5mm either side of a driver before the side wall , with successful space for a grille to slide in

so you might not even need to change the baffle

i was going to say expand all sizes by 18/15ths but then i saw the size of it already smiley3 never knew they were that big!

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13 years 8 months ago #12505 by mykey-
Replied by mykey- on topic Sons of JBL:Part 1:18" Version of JBL 4520

bitzo wrote: so A style for upright corner brace and B style for upleft one? and always 45 degree mitre?

when I said 45's I meant angles, not literally 45 degrees

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13 years 8 months ago #12507 by bitzo
Replied by bitzo on topic Sons of JBL:Part 1:18" Version of JBL 4520
if we start from this plan... I think we should start from compression ratio so for a throat of 60 cm of width we get an height of 30.5 cm (4520 compression ratio) or 34 cm (4530 compression ratio). But I guess isn't really the correct way.

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