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Old 28th May 2006, 11:46 PM   #1
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Default Want to build a horn box for my JBLs (Pics!!!)

Hey guys, I have a set of L88s from 1974 in amazing condition.

I popped out the subs, and wow... Quality.

Anyways, I was thinking about building horn boxes for these.

Would it be reccommended?

I don't have the specs of these so its hard to figure out the design for it and size. Anyone got something you think would work for it?

BTW, the model of the sub itself is 123A-1 the model of the speaker, (sub, box, tweeter combo) is L88... Just to make it clear.

Zac

P.S. Here are pics:

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Old 29th May 2006, 12:32 AM   #2
chops is offline chops  United States
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Those are 12" drivers, correct? I believe they were best in something like 2.5-3 cu.ft ported enclosures. That is if they were anything like my brother's old JBL L112's from the early '80s.

What would you want to build a horn for, for just woofer duty or subwoofer duty? I only ask because I'm not too sure if they do/can extend down low enough to do an acceptable job as subwoofers.

I could be wrong though.
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Old 29th May 2006, 12:34 AM   #3
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Hmm, true, the L88s only came with sub and tweeter, next model up, L100 came with sub tweeter and mid.

That makes me think, do these play in between mid and base?

Anyways, yes, they are 12"... I just want to get as much bass out of them as possible.

Zac
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Old 29th May 2006, 01:20 AM   #4
PSz. is offline PSz.  United States
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T/S parameters are here:
http://www.jblproservice.com/pdf/Thi...Parameters.pdf

regards,
PSz.
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Old 29th May 2006, 02:05 AM   #5
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Thanks.

I have been trying to enter it into WinSD however I cant get it to work I am missing some info.

I am mainly missing:

Hc, Hg and Pe
CMS
Dd
RMS


Everything else is filled in fine.


Got any ideas?

This is the problem:
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File Type: gif winsd problem.gif (6.7 KB, 224 views)
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Old 29th May 2006, 02:07 AM   #6
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I then re-entered all data in the suggested order but was missing those details.

After trying it all It auto calculated all those details, except RMS.

Anyone see problems?

Thanks,
Zac

P.S. I tried 150 RMS which is what I think may be right and it displayed the same problem notice...
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Old 29th May 2006, 02:36 AM   #7
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I found this:

http://manuals.harman.com/JBL/HOM/Ow...nual/L88om.pdf

I basically got from it that "a quality amplifier delivering up to 75watts RMS per channel will provide optimum performance."

So I plugged in 75 RMS and still the same error message.

Edit:

Just found this:

http://www.jbl.com/home/products/pro...CheckProduct=Y

Does this mean the unit is 50 RMS?

Edit2:

Found this:

http://www.bassreflex.de/index/JBL/jbl.htm

Edit3:

http://audioheritage.csdco.com/vbull...ead.php?t=4961

Zac
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Old 29th May 2006, 03:44 AM   #8
chops is offline chops  United States
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BTW, it's not a subwoofer, just a regular woofer.
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Old 29th May 2006, 04:49 AM   #9
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you coudl probably make it a horn loaded subwoofer though because its got a fiar bit of xmax and a qes>7, and the fs will be ok cause bass horns never have too low a cutoff.
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Old 29th May 2006, 07:29 AM   #10
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Your Vas is wrong (way to big) and does influence other parameters as well, so does Sd 0,05 in^2 seems a bit small (SPL and No are totally off). Perhaps you should check the units used in the sheet and change them accordingly in WinISD.

Rms is a mechanical parameter, it isn't and has nothing to do with the (rms-)powerhandling. However Pe is the electrical Powerhandling (in Wrms).

Hc, Hg aren't necessary, they're used to calculate Xmax, Xlim can also stay blank.

With kind regards Johan
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