Any horn loaded plans for JBL 2242? - AVS | Home Theater Discussions And Reviews
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post #1 of 23 Old 04-26-2015, 12:21 PM - Thread Starter
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Any horn loaded plans for JBL 2242?

Does anyone know where I can get some plans for a horn loaded cabinets for my JBL 2242's?


Been holding on to these for over a year and have seen many for their 15" drivers but not for an 18"


Thank you!

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post #2 of 23 Old 04-27-2015, 08:57 AM
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You might research the old E-horn designs used by Universal in Earthquake way back when. The same design was used by Serv-O-Drive for the Michael Jackson tour, with the rubber-band drive replacing the 18".

Horn physics haven't changed much since Lord Rayleigh.
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post #3 of 23 Old 04-27-2015, 11:01 AM
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http://www.inlowsound.com/

Check out the 80hz midbass horn with the 2240. I am thinking you're referring to bass horns though.

JoshK on most other audio forums
Quantity only when quality is ensured.
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post #4 of 23 Old 04-27-2015, 03:43 PM
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jbl had one for a while:


http://www.jblpro.com/ProductAttachments/ASH6118.pdf
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post #5 of 23 Old 04-27-2015, 04:00 PM
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a while back somebody posted up the fold of a cv horn.


a quick back of the envelope shows this is how the 2242 would perform if the internal width (panel width) was 24" (for a total final width of about 25.5")


pretty small horn, but if targeting 50hz and up and you want something already drawn out. :-)








no guarantees on the hornresp model. I used "eyeball" it method. some days my eyeball works better than others. :-)


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post #6 of 23 Old 04-27-2015, 04:02 PM
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Quote:
Originally Posted by LTD02 View Post
My inspiration for my 25hz design BUT that JBL is a BEAST. If there isnt a design out there I am sure you could design one yourself.
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post #7 of 23 Old 04-27-2015, 04:54 PM
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here is a very rough guesstimate of the jbl horn. I've been curious about it forever, so went ahead and gave it a shot.













max spl is pretty awesome. excursion minimum is in the 40's, so a high pass below that would be necessary. 9mm excursion get to 134db though and the jbl has more in the tank than that.

it is a big badazz midbass monster. two ported cabs get up around 131db tuned similarly, so the horn is equal to about 3 ported cabs plus or minus. this one is 24" internal wide, 25.5" total width. that is a little wider than the truck pack friendly width of the 6118 which is a little under 24" total width.
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post #8 of 23 Old 04-27-2015, 05:00 PM
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I want one. Pool party sub!
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post #9 of 23 Old 04-27-2015, 05:09 PM
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it would actually be a good sensitivity match for some bose cubes...


























....60 of them. ;-)






.

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post #10 of 23 Old 04-27-2015, 05:18 PM - Thread Starter
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Quote:
Originally Posted by AudioJosh View Post
http://www.inlowsound.com/

Check out the 80hz midbass horn with the 2240. I am thinking you're referring to bass horns though.
Josh, this is more of what I am looking for but for the 2242:
http://www.ebay.com/itm/Altec-Lansin...item51cfbdebcb


I'm familiar with the inlowsound products

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post #11 of 23 Old 04-27-2015, 05:20 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post





LTD02, hey man! Yes I'm familiar with that beast as well but the other one you posted I have never seen. Interesting!
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post #12 of 23 Old 04-27-2015, 05:25 PM
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that will only get you horn loading from about 200hz up.


here is the 2242 in a ported cab tuned to 30hz with a short 1-foot-deep horn "snub" on the front.





that peak is what you are shooting for and it will be lowered in frequency proportional to horn length. to get it down to about 100hz, the horn has to be about 3 feet long or so.
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post #13 of 23 Old 04-27-2015, 05:47 PM - Thread Starter
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Im looking for something to blend better with my subs than what I have. I'm just not happy with my 4509 LE enclosures. I am still searching for a special midbass that I think i'm only going to get with a horn type enclosure like the A7. Im not looking for anything under 80hz because I have enough for a few households. I'm almost starting from scratch and building around the output of my Bass Cannon subs.


So....I have the 2242's which are supposed to be a punchy mid bass but even if I have to drop to 15" to fit a horn type cabinet I am willing to do that. My best case scenario would be using the 2242's that I already have though...

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post #14 of 23 Old 04-27-2015, 05:52 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post
here is a very rough guesstimate of the jbl horn. I've been curious about it forever, so went ahead and gave it a shot.













max spl is pretty awesome. excursion minimum is in the 40's, so a high pass below that would be necessary. 9mm excursion get to 134db though and the jbl has more in the tank than that.

it is a big badazz midbass monster. two ported cabs get up around 131db tuned similarly, so the horn is equal to about 3 ported cabs plus or minus. this one is 24" internal wide, 25.5" total width. that is a little wider than the truck pack friendly width of the 6118 which is a little under 24" total width.
Big badazz midbass monsters to go with big badazz bass cannons...hmmmmm sounds like what i'm talking about

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post #15 of 23 Old 04-27-2015, 05:55 PM
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hhmmm....
with under 80hz covered, some sealed cabs for the 2242's could be an easy start.
do you have dsp to control the crossover points on the 2242?

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post #16 of 23 Old 04-27-2015, 06:44 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post
hhmmm....
with under 80hz covered, some sealed cabs for the 2242's could be an easy start.
do you have dsp to control the crossover points on the 2242?

DSP is not an issue, but....I still do not think sealed cabs are going to make that "magic" mid that I'm looking for. I could be wrong but I'm wondering if some guys "ears" just like the sound that comes from a horn loaded type enclosure. I could also just be chasing something that is all in my mind. I think of it like tube audio vs digital, to me Tube audio is much better sounding than digital. Not that digital is bad, its just that my ears are "tickled" by tube gear. A little off track but whenever I get this figured out I already have my 125wpc tube amps ready for these midbass cabinets and will be running 60wpc on the top so horns are going to use less power which is better for my amps and still deliver the spl. If I go sealed they will require more power which will require that I keep solid state amps for my midbass drivers.


So my goal is this:


LCR= Bass Cannons................Horn loaded Midbass...........JBL/EV/? horns
...............10?- 80hz?....................... 80?-400?..........................400?-18-20k
Power= Sanway Clones................... 125wpc........................ Tube 60wpc Tube



Current:
LCR= Bass Cannons............... JBL 3722
4-EP4k's...................... 2-Crown X4K






SPL= ? ? ?


Movie mode- DSP
Music mode- switch to Tube pre-amp

Have a Happy and safe New Year!!!

Last edited by 316; 04-27-2015 at 06:48 PM.
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post #17 of 23 Old 04-27-2015, 07:58 PM
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there are several options there.
just to get started, you may want seal up (stuff the ports) on your mains and high pass them 3rd order somewhere around 200hz.
that will give you a very close to 4th order acoustic around 175hz.
then 2242s in sealed cabs low passed around 135hz 4th order and level adjusted up a hair will actually intersect with the mains around 175hz, again 4th order acoustic as well.
then the 2242s can be crossed to bass cannons in the 60hz ballpark.
i'd keep loads of power on the 2242s, maybe a bridged ep4k each and save the tubes for the mids/tops. (not sure if the mid/tops can be passive bi-amped or not).
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post #18 of 23 Old 04-27-2015, 10:08 PM - Thread Starter
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Sounds like a good plan to try, what size should the cabinets be? Should be able to whip those out fairly easy.
the mid/horn can be passive bi-amped.


Damn good idea LTD02!! Thanks!

Have a Happy and safe New Year!!!
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post #19 of 23 Old 04-27-2015, 10:09 PM - Thread Starter
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If that does not work at least I tried before giving up on the 3722's

Have a Happy and safe New Year!!!
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post #20 of 23 Old Yesterday, 04:25 AM
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Quote:
Originally Posted by 316 View Post
DSP is not an issue, but....I still do not think sealed cabs are going to make that "magic" mid that I'm looking for. I could be wrong but I'm wondering if some guys "ears" just like the sound that comes from a horn loaded type enclosure. I could also just be chasing something that is all in my mind.
I think you are chasing the audio dragon. I've used a lot of JBL 2241/2 as midbasses, and once in a horn (2 in each - not my design so I can't post it) but ended up using a 2225 on a midbass horn with an 8' path length IIRC without digging up the old notebooks. I don't see any advantage to the horns over sealed unless you have very little power, especially over such a narrow BW. I'd do as LTD suggested.
@Qt=0.707 I get around 44L net when stuffed and an F3 of 93Hz. I'd try a second order 80Hz HPF with a Q around 1.2 to flatten the bottom a little.
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post #21 of 23 Old Yesterday, 09:06 AM - Thread Starter
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Thoughts overnight....

......reset......computing......

Have a Happy and safe New Year!!!

Last edited by 316; Yesterday at 12:42 PM.
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post #22 of 23 Old Yesterday, 09:21 AM - Thread Starter
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I like LTD02's thought of getting the Cannons down to 60hz btw.

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post #23 of 23 Old Today, 12:35 AM
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Some dedicated dance systems of today typically use a mid bass style cabinet that you are looking for, they tend to XO to the subs at about 70-100Hz and on the top end they XO to their speakers around 180-250Hz, I reckon 80Hz and 200Hz is about right.

The sealed will work but the horn will be better. Your going to need a lot more drivers and power to match the horn with sealed cabinets. If you are not getting what you need you may want to try and play with the response at the LP, it makes a significant difference.

If you have space, I'd recommend a straight horn about 4 feet deep, XOed at 80Hz, make sure to use an appropriate driver for it and when you sim the cab it should ideally have usable bandwidth about an octave above the intended XO to speakers. I think a 200-250Hz XO is about right depending on what speakers you use.

I'd also highly recommend using a 15" driver, they tend to be better suited for more top end response, you don't need the vd of the 2242 in the 80Hz + band. The 2226 has sufficient vd for this and will do a better job IMHO.
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