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Post subject: Cabinet Dimensions for D 130F?
Posted: Fri Jan 16, 2015 6:13 pm
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So I finally acquired a real JBL D 130F at a very reasonable price, $50 American. The speaker has been reconed, as you would imagine, but it's an older recone from the late '80's, and sounds great. It's 8 ohms. Unfortunately, the guy I bought it from wanted to keep the cab it was in, and for fifty bucks I wasn't going to argue.
My question is, what kind of dimensions should I look for in a Cabinet to bring out the most in this speaker? Open or closed back? Ported or not? Insulation necessary?
I'll probably be pairing this with my '68 Dual Showman Reverb (85 W). I know there's an impedance mismatch, and I've read all kinds of wildly different info regarding power handling capacity for this driver, from 25W low end to 75W + at the high end. There are even discussions with Harvey Gerst claiming these numbers are for full range sound reproduction, and that for single instrument applications like electric guitar it should be able to handle upwards of 100W.
I never dime the Showman anyway, and I plan on taking it slowly and easily with this speaker until I establish some parameters. I can always pull a pair of tubes to reduce wattage and have a perfect impedance match if necessary.
I see empty used cabs for sale cheap all the time, and I suppose I could make one if I have to.
Anybody have any experiences for the best type of cab to make this holy grail speaker really shine? Thanks for any input!


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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Fri Jan 16, 2015 7:39 pm
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Sorry, but I would not push more than 40-50 watts through a JBL D130F...that is all they are good for. IIRC they were only rated at 35 watts RMS (Continuous).

Remember Dick Dale used to shred these speakers on a regular basis through his Showman.

I also wouldn't run an ohm mismatch unless you like taking chances with your amp and speaker...this type of stuff always ends bad.

Maybe this post will bring out our resident expert on JBL's Retroverbial to give you additional information! Come on Arjay!

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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Mon Jan 19, 2015 1:47 am
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T2Stratman wrote:
...I also wouldn't run an ohm mismatch unless you like taking chances with your amp and speaker...this type of stuff always ends bad...


Really? There is not one thread on this forum about an impedance mismatch causing any harm to a tube amp. Myself, and many other forum members, routinely run a mismatch with zero problems. Apparently, the fear of the unknown causes parroting of the false statements about mismatched impedance.

Keep any mismatch to within a 2 to 1 ratio, high or low, and the amp won't even flinch. :wink:

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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Mon Jan 19, 2015 9:03 am
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shimmilou wrote:
T2Stratman wrote:
...I also wouldn't run an ohm mismatch unless you like taking chances with your amp and speaker...this type of stuff always ends bad...


Really? There is not one thread on this forum about an impedance mismatch causing any harm to a tube amp. Myself, and many other forum members, routinely run a mismatch with zero problems. Apparently, the fear of the unknown causes parroting of the false statements about mismatched impedance.

Keep any mismatch to within a 2 to 1 ratio, high or low, and the amp won't even flinch. :wink:



Yeah, I've always understood the same thing, that most Fender amps would easily handle a 100% mismatch ( 8 ohms to 4 or 16, e.g.) without threat of damage. And honestly, for years I just plugged a head into a cab with no thought of matching impedance, and never had a problem-some just sounded better than others.
But back to the matter at hand...doesn't anybody out there have any thoughts about the ideal size and type of enclosure to hold a D 130F?


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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Mon Jan 19, 2015 10:38 am
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nyquilcoma wrote:
shimmilou wrote:
T2Stratman wrote:
...I also wouldn't run an ohm mismatch unless you like taking chances with your amp and speaker...this type of stuff always ends bad...


Really? There is not one thread on this forum about an impedance mismatch causing any harm to a tube amp. Myself, and many other forum members, routinely run a mismatch with zero problems. Apparently, the fear of the unknown causes parroting of the false statements about mismatched impedance.

Keep any mismatch to within a 2 to 1 ratio, high or low, and the amp won't even flinch. :wink:



Yeah, I've always understood the same thing, that most Fender amps would easily handle a 100% mismatch ( 8 ohms to 4 or 16, e.g.) without threat of damage. And honestly, for years I just plugged a head into a cab with no thought of matching impedance, and never had a problem-some just sounded better than others.
But back to the matter at hand...doesn't anybody out there have any thoughts about the ideal size and type of enclosure to hold a D 130F?


Do as you wish, but it is your power tranny not mine. It might work for a while, but they were designed to run a certain way for a reason overbuilt or not.

As for the cab, this might sound obvious but if you are going to run a 1x12 JBL, why not just build a cab the original dimensions? Worked for Fender, these were built and tuned specifically for the JBL option. Maybe even try a tone ring?

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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Mon Jan 19, 2015 6:22 pm
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Here's the JBL speaker data page from their 1975 brochure. Looks like the D130 will work in cabinet of 4-12 cubic feet. Prolly depending on if the cab has open back, vented, ported, or sealed back.


Image


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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Tue Jan 20, 2015 1:19 pm
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Thank you for your replies gentlemen, esp. BMW2002. The 4-12' ft3 from the JBL catalog seems pretty general-anyone got more specific sorta HxWxD dimensions? Likewise, original Showman single 15" cabs are simply ginormous! Think it's possible to find/build a smaller enclosure? Likewise, I've seen re-issue tone rings for sale, and they seem cost prohibitive (unless you've got some leads?), and the dual baffle looks complicated.
Again, recommendations for open vs. closed back, ported vs. non, MFD vs laminate vs. pine? Baffle wood choices ( this driver is heavy!)? Websites with cab plans? Please, any and all suggestions and experiences are welcome! Thanks, O...


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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Fri Jan 23, 2015 6:04 pm
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nyquilcoma wrote:
Thank you for your replies gentlemen, esp. BMW2002. The 4-12' ft3 from the JBL catalog seems pretty general-anyone got more specific sorta HxWxD dimensions? Likewise, original Showman single 15" cabs are simply ginormous! Think it's possible to find/build a smaller enclosure? Likewise, I've seen re-issue tone rings for sale, and they seem cost prohibitive (unless you've got some leads?), and the dual baffle looks complicated.
Again, recommendations for open vs. closed back, ported vs. non, MFD vs laminate vs. pine? Baffle wood choices ( this driver is heavy!)? Websites with cab plans? Please, any and all suggestions and experiences are welcome! Thanks, O...


You might try Mojotone, for size dimensions.

http://www.mojotone.com/amp-parts/cabin ... on+Cabinet

I like the closed back for extension cabs, I think it projects better. Do I have any proof beyond my own empirical data from gigs? No, but I think I have a pretty good ear and it suits me. Not sure how much you change the specs of the Mojo cabs, but I am betting if you call them, they will have some recommendations for you.

When I built new baffles for my Bantam Bass Amp refurbs I used 1/2 inch particle board (Same as Fender used on these amps). While the 15 inch Concert Speaker I put into one of these amps does not weigh in like your JBL, it is MORE than strong enough to handle
that beefy puppy.

HTH

T2

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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Fri Jan 23, 2015 10:54 pm
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There is absolutely nothing wrong with using ½-inch MDF as baffle-board material for mounting a 15-inch JBL speaker. Every Dual Showman and every FEIC blackface Vibroverb ever made was so constructed.

However, I'll posit this caveat -- at nearly 17 lbs each, the D130F and D140F are likely the upper limit that particle board can safely support. If using a heavier speaker such as the EV-SRO or the Gauss-Cetec PS15, I would recommend that birch ply be used.

Arjay

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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Tue Jan 27, 2015 3:04 pm
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Again, thank you for your replies, gentlemen. I guess I may be looking into building my own cab (a first for me), and the 3/4 birch ply for the box with 1/2"-5/8" MDF for the baffle seems to be the general consensus. What are your thoughts on open vs. closed back for this driver? I know the original Showman cabs were all closed back (were there any open-backed ext. Fender cabs?). Closed back cabs are supposed to be boomier, more directional, and require less power to reach required volume, while open backs are said to be airier, more room-filling and less focused. Also, open backs seem to require less thought in construction, as exact specs on dimensions, interior volume, damping material, porting, etc., aren't major concerns, so one might be an easier first time build. Any thoughts/experiences? As always, thanks, the wealth of info on this forum always staggers me!


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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Tue Jan 27, 2015 4:17 pm
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I am currently building this open-back 1 x 15 cabinet for use with a Princeton head conversion......

Image

Image

Exterior dimensions are 24"W x 20"H x 11.5"D, constructed of 3/4" finger-joined pine planks, ½" birch play for the baffle board, and ¼" birch-ply for the rear panels. Vintage hardware and coverings to match Fender's silverface paradigm and the speaker will be a fresh JBL D130F.

I fully anticipate that it will rock.

Arjay

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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Tue Jan 27, 2015 8:17 pm
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Arjay, as ever, you the man! That looks like just the ticket. Thanks for your specs, let us know how it comes out. Hope you won't mind some questions from me in the future.


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Post subject: Re: Cabinet Dimensions for D 130F?
Posted: Tue Jan 27, 2015 8:41 pm
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nyquilcoma wrote:
Hope you won't mind some questions from me in the future.


I believe you have my e-mail addy so feel free to 'indulge' yourself.

Arjay

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