Any Exp. w TH using JBL 2206 or 2226? - diyAudio
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Old 10th August 2008, 10:02 PM   #1
HK26147 is offline HK26147  United States
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Default Any Exp. w TH using JBL 2206 or 2226?

Has anyone made ( or got ideas ) on Tapped Horns using a JBL 2206 12" or a 2226 15"?
I did a search of this massive forum and didn't find anything
Thanks
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Old 11th August 2008, 05:44 AM   #2
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These were some of the first numbers I ran for TH potential, but didn't publish because no one asked about them AFAIK. Anyway, they are quite large at ~520 L/2206 and ~1054 L/2226, so didn't pursue them.

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Old 11th August 2008, 06:50 AM   #3
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Here is one I posted here earlier for three stacked 2226s for PA:

Click the image to open in full size.

Here is a very small one for a portable DJ:

Click the image to open in full size.

The first one is useable to 30hz, the small one 45hz (dance music has its peak output around 55hz).
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Old 12th August 2008, 04:25 PM   #4
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First cut through Hornresp - They are big @ 320 Liters+, but 95 dB(-0/+2) into half space @ 2.83 V/1M from 35 Hz to over 100 Hz. There is a pronounced (+5 dB) step in the response above 100 Hz. This is a symmetric design (L12 = L34) so if I fiddle with the design a bit more I might be able to knock that peak down a bit. There does not appear to be an excursion problem.
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Old 12th August 2008, 05:52 PM   #5
HK26147 is offline HK26147  United States
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Thanks All for responses so far.
It looks like no one has built a TH with either of these drivers.


djk: I will keep the 1st sim you listed in mind.
How big is it?
On the 2nd one:
Quote:
Here is a very small one for a portable DJ:
What does very small translate into ( cu ft wise )?

JBL, of course makes no recommendation on usage in horns for either driver, but shows a 2206 in a 4cu ft reflex tuned to 40Hz - I'm guessing approx 95 - 97db 1 watt.
And is that the Max SPl for 3 cabs @ 56.6Vrms?

* I have played w Honresp but not Akabak

Using the 2206, my goal is not max extension but closer to the 45Hz that was listed.
With the 2226 - JBL uses a 10cu. ft. BR tuned to 40Hz.
guessing approx 95 - 97db 1 watt as well.

Mike: I'm assuming that is for the 2226 15", and 11.3 cu ft is only a little bigger than the JBL B/R.
It's it possible to trade a little LF extension for more efficiency at similar or smaller cab vol?.
* A friend has an equal number of 2206 and 2226's.
I wondered if the 2206 by virtue of a stronger BL was a better candidate for horn use than a 2226.
Thxs
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Old 12th August 2008, 05:57 PM   #6
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Sorry I was not clear, that was the 2206 in that model. I have found that a stronger BL does not always help in a TH.

Have not looked up or entered the specs for the 2226 yet, might be able to get to that tonight - we'll see.
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Old 12th August 2008, 06:17 PM   #7
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That's OK Mike
I did wonder why a horn cab that big w that 15 would not have greater SPL than it's B/R equivalent.
With a 2206 that cab manages to bring the extension way down below the fs of the 2206 ( at the expense of size ).
I haven't convinced my friend to remove any of these drivers from the existing cabs so I can check T/S parms.
Of course he is from the school of "if a 12" is good, a 15" is better, and an 18" is best"
He does have (2) 2242 18's drivers in B/R cabs, AND the thought of putting those 18's has come up, but I figured ( in error? ), that of those 3 drivers the 2206 was better suited for horn use, and perhaps the 2226 and 2242 were not.
Bear in mind; This is for his band's PA, so the 20 - 40 HZ octave is filtered out anyway.
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Old 23rd August 2008, 06:30 AM   #8
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Quote:
Originally posted by HK26147

Mike: I'm assuming that is for the 2226 15", and 11.3 cu ft is only a little bigger than the JBL B/R.
It's it possible to trade a little LF extension for more efficiency at similar or smaller cab vol?.
* A friend has an equal number of 2206 and 2226's.
I wondered if the 2206 by virtue of a stronger BL was a better candidate for horn use than a 2226.
Thxs
Yes - it is possible to cut cabinet size considerably if the bottom octave is not needed. SPL picks up a bit too, but shrinking the cabinet cuts the SPL back down (no free lunches).

The 2206 driver in a 3 or 4 segment conical TH that simulates fairly flat from 40-120 Hz, and is capable of 95 dB @ 2.83 V 2 pi has an internal volume of about 185 L (6.6 Cu Ft.) which is significantly smaller. The 2226H takes a little more volume than the 2206, but the design and response remain similar between the two.

Honestly - I am still not sure what drivers are "best" for TH's, so I have no idea as to which (2206 vs 2226) is the better choice. Without details as to the specific driver (G, H, or J) or actual measured T/S parameters, it is hard to say what the best choice is - the design can be tweaked to make either work very well.

Measure, simulate, design, build, measure,......you see where this is going.
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Old 23rd August 2008, 07:01 PM   #9
HK26147 is offline HK26147  United States
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The cab volumes I listed earlier ( From the JBL Professional Enclosure Guide ) was incorrect.
They recommended a 2cu ft cab tuned to 40Hz for the 2206.
They recommended a 4cu ft cab tuned to 40Hz for the 2226.

Since a 2206 produces 95 - 96db in a small BR box, the only way I would consider going to a larger cab box required for a horn is for extra sensitivity above 95 - 96db.
In theory a folded horn 48"H x 24"x ( 13.5 - 18" wide ) should be good for 98db @ 40Hz to 102db @ 100Hz.
But those cabs are 9 cu ft for the 13.5" width and 12cu ft for the 18" width.

In weighing the possibilities for the 2206; I recall the paper:
"An Efficiency Constant Comparison Between Low-Frequency Horns and Direct-Radiators," Presented at the 54th Convention of the Audio Engineering Society, Preprint No. 1127 (M-1), (May 1976).
In which Don Keele detailed the conditions under which B/R boxes ( which don't require the large boxes ) offer a better solution.
In 8 cu ft I can fit 4 2206 in 2 cu ft boxes, the same space as a single driver horn.
In one situation, I am helping a friend convert existing large boxes that house 2 2206. Since the bottom octaves are handled now by 2 JBL 2242 18" drivers, there is no need ( in this case ), for the 2206 to have to be able to achieve 40Hz.

For the 2206, a QB3 box of .93cu ft. gives a 75Hz F3. In that case 8 2206 could fit in 8 cu ft ( approx ) and be hooked in a series/parallel group to yield 4 ohm load (4800 watt rating ) and be fed by a single bridged Crown Macro 2400.
He may opt for this option, as he has the drivers, & the amp, and the cabs build would be straightforward and easy, and modular.

If I had the luxury I would like to compare the folded front horn ( above ) vs a TH of similar size using 2206.

Also I think horn loaded 2206 would work well, for the range from 80Hz to 1Khz.

Thanks Mike
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Old 23rd August 2008, 08:46 PM   #10
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"Also I think horn loaded 2206 would work well, for the range from 80Hz to 1Khz."

With a mass corner of about 300hz, it is going to take a lot of boost to make it go to 1Khz.
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