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Discussion Starter #1
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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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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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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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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it would actually be a good sensitivity match for some bose cubes...


























....60 of them. ;-)






.
 

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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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Discussion Starter #13
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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Discussion Starter #14
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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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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Discussion Starter #16 (Edited)
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
 

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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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Discussion Starter #18
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!
 

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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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