Dual 18" PA subs for live sound in club... - diyAudio
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Old 15th September 2010, 11:01 PM   #1
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Join Date: Aug 2010
Default Dual 18" PA subs for live sound in club...

So.... I can't get the 36-40 hz response I need in the package I want with diy tapped horns.

Is there a reason to break a dual 18" sub into 2 separate chambers? I'm Ok with shutting down the box if one sub blows. My 2x10" ports are already pretty long.

Fixed install in 120 capacity bar

Do you think 3/4, MDF, plywood bracing, titebond II, 1 1/2" brads will be ok? Probably carpet or that roller grade duratex.
I'm thinking 10" sonotube for the ports. Can one miter those?







I really wanted to build a couple of these but the kappalite 3015lf is much lumpier in this and the b&c driver cost is too high for 2 subs. If anyone can make a 3015lf version or guide me with some hints!Click the image to open in full size.
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File Type: gif VB Response dayton pe460 18.gif (29.1 KB, 834 views)
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Old 16th September 2010, 01:24 AM   #2
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Have you had a look at Jbells tapped horns? All use the 3015lf and will hit the 40hz, the larger one will hit the high 30's, there is also the mth4654

MTH-4654
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Old 16th September 2010, 10:57 PM   #3
tb46 is offline tb46  United States
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Default Just one more 3015 TH Sub

Hi,

Try these values in Hornresp:

ID=28.00
Ang=2.0 x Pi
Eg=2.83
Rg=0.00
Fta=4.07
S1=540.00
S2=542.26
Par=5.00
F12=0.00
S2=542.26
S3=633.00
Par=201.00
F23=0.00
S3=633.00
S4=1669.24
Par=94.30
F34=0.00
S4=1669.24
S5=1900.00
Par=21.00
F45=0.00
Sd=881.10
Bl=18.50
Cms=1.40E-04
Rms=3.90
Mmd=85.40
Le=0.90
Re=5.30
TH=1
Vrc=0.00
Lrc=0.00
Ap1=542.00
Lpt=1.80
Vtc=1800.00
Atc=1000.00
Pmax=500
Xmax=11.0
Comment=TH_Eminence_3015LF_by tb46_Try_chamber_270 L

Regards,
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Old 17th September 2010, 02:51 AM   #4
tb46 is offline tb46  United States
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Default Hornresp Export file, and Input screen for above:

Regards,
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File Type: jpg 3015_270L_chambered.jpg (46.9 KB, 798 views)
Attached Files
File Type: txt 3015_001.txt (450 Bytes, 50 views)
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Old 18th September 2010, 07:47 AM   #5
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tb46: you did a great job with that sim!
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Old 18th September 2010, 04:58 PM   #6
tb46 is offline tb46  United States
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Hi hellonwheels,

Happy you like it. Maybe you can use it as a starting point for your project. Jbell's stadium horn is still close to the sweet spot for fixed installations (and ease of build), but, you are looking at about 540 L net.

Regards,
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Old 19th September 2010, 12:26 AM   #7
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hellonwheels, there is another option, and one I'm considering to hit the low 30's! And its the HOG scoop, you can finds lots of info on this on speakerplans and freespeakerplans, google.

The rated drivers for this are the Void 1000/1200, PD1850, B&C 18tbx... If I build it I will be going with a fane 18xb as this has been said to be a good budget option. The only downfall for this design is that it doesn't play high 90-110, so an upper bass cabinet may be needed depending on you're taste.

The hog scoop is not like common scoops, and has been said to have more of a folded horn sound.
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Old 19th September 2010, 02:43 AM   #8
tb46 is offline tb46  United States
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Hi CuttaBoi,

The last time I checked out the Hog scoop (by staiper?) it was with a PDA1650, and the Hornresp net volume was 550 L. The SPL response would fall under: "it's the kind of thing you like, if you like that kind of thing", and that is modelled as a tapped horn, or normal. Definitely usable, but not in the same league with a properly designed tapped horn of the same volume using the same driver. But then again, I might be wrong.

Any specific links?

Regards,
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Last edited by tb46; 19th September 2010 at 02:52 AM.
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Old 19th September 2010, 09:33 AM   #9
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Quote:
Originally Posted by tb46 View Post
Hi CuttaBoi,

The last time I checked out the Hog scoop (by staiper?) it was with a PDA1650, and the Hornresp net volume was 550 L. The SPL response would fall under: "it's the kind of thing you like, if you like that kind of thing", and that is modelled as a tapped horn, or normal. Definitely usable, but not in the same league with a properly designed tapped horn of the same volume using the same driver. But then again, I might be wrong.

Any specific links?

Regards,
Plans can be found here

Yep correct mate, designed by staiper, don't quite get you on the spl responce, care to elaborate a little mate?
Plans can be found at, Hog Scoop, theres also alot of build threads / info on speakerplans.com forum..

I've not actually seen any HR plots for it, but does have a huge amount of respect on Speakerplans - Was told that standing in front of (one or may have been a few) was like a full body massage! lol

The reason I'm leaning towards them is I can get hold of second hand Fane 18xb's for around 90, which would make them quite a cheap build.

If you come up with a better alternative, please do share
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Old 19th September 2010, 09:53 PM   #10
tb46 is offline tb46  United States
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Hi CuttaBoi,

Here are the SPL response plots I had seen before. I don't recall the source for the Hornresp input data. When I get "a round to it" I'll try to take a look at the hopefully up-to-date data on freespeakerplans. Thanks for the link.

Regards,
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File Type: jpg Hog_1_2_small.jpg (28.7 KB, 658 views)
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