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Tapped Horn Build pics
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davey t View Drop Down
Young Croc
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Joined: 11 March 2004
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Points: 1428 		Post Options Post Options   Thanks (0) Thanks(0)   Quote davey t Quote  Post ReplyReply Direct Link To This Post Topic: Tapped Horn Build pics
    Posted: 09 August 2007 at 8:41pm
That response looks typical of a tapped horn not configured properly. You get a big dip in the middle and two peaks either side. The dip went away with mine when i put in the correct driver etc. 
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tommysb View Drop Down
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Here's a response plot taken with an ECM8000 about a meter away, no idea of the power going in or anything, but it shows there's a 10db dip at 60Hz. It sounds alright with the 60hz slider all the way up on my graphic.

Any thoughts?

EDIT: Stuck pink noise through a pair of these and recorded it into cubase, then used spectral analysis in sound forge. Guessed best settings etc for the analysis.


Edited by tommysb - 09 August 2007 at 7:39pm
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tommysb View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 07 August 2007 at 7:40pm
Had a play with a pair of these today, bit of eq at 60Hz, and I was pleasantly suprised! Considering the cost of the drivers, it's a viable suicide rig option, will try and take some measurements tomorrow, but it's sounding alright so far!
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_djk_ View Drop Down
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Joined: 23 November 2004
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Points: 6002 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 12 June 2007 at 4:40am
It looks bad on sine waves, but it may be OK for program.
 
If It was me, I would slap another piece of ply over the two 10" holes and stuff a big x-max 15" in it.
djk
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tommysb View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 11 June 2007 at 12:29pm
Have you looked at the excursion at about 250w? I've found the AkAbak model gives a high excursion (10mm+) and it appears to be the same with this model. (outside xmax, though within XMech)

Danley's whitepaper comments on the effectiveness of the tapped horn at controlling excursion.

Is it just a parameter the model is not very good at predicting, or would you realistically expect that sort of excursion?

Cheers,
Tom
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_djk_ View Drop Down
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Joined: 23 November 2004
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Points: 6002 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 11 June 2007 at 1:17am
Here is a script I dashed off in about five minutes for a pair of Eminence DELTALITE® II 2510 (a P-Audio WN-10S is almost identical).
 
Def_Const |Horn Dimensions
{
a1 = 500e-4; |Area at throat (cm^2)
a2 = 700e-4; |Area at rear of driver (cm^2)
a3 = 3100e-4; |Area at front of driver (cm^2)
a4 = 3200e-4; |Area at mouth (cm^2)
l1 = 20e-2; |Distance from throat to rear of driver (cm)
l2 = 180e-2; |Line distance from rear of driver to front of driver (cm)
l3 = 10e-2; |Distance from front of driver to mouth (cm)
}
Def_Driver 'Dr1'
| Eminence 2510ii
Sd=700cm2
fs=53Hz
Qes=0.45
Qms=5.76
Vas=105L
Re=2.53ohm
Le=0.2mH
system 'S1'
Driver Def='Dr1' Node=1=0=3=4
Waveguide 'W1' Node=2=3 STh={a1} SMo={a2} Len={l1} Conical
Waveguide 'W2' Node=3=4 STh={a2} SMo={a3} Len={l2} Conical
Horn 'H1' Node=4 STh={a3} SMo={a4} Len={l3} Conical
 
It's 105dB in the 50hz~60hz region (with 1W, 2V at 4 ohms), and ±2dB from 48hz~150hz (2Pi). I think the Eminence pair would handle 500W/4R rated amp on program material.
 


Edited by _djk_ - 11 June 2007 at 1:20am
djk
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tommysb View Drop Down
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Joined: 24 April 2006
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 10 June 2007 at 6:21pm
cool thanks for that!
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_djk_ View Drop Down
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Joined: 23 November 2004
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Points: 6002 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 10 June 2007 at 2:45pm
The Fs of the chosen driver is way too low for proper tapped horn use.
 
Danley recommends the Fs be a half octave above the Fc of the horn (a 70hz driver for a 50hz horn).


Edited by _djk_ - 10 June 2007 at 2:46pm
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nightline View Drop Down
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Joined: 28 February 2004
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Points: 70 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nightline Quote  Post ReplyReply Direct Link To This Post Posted: 10 June 2007 at 10:14am
I think that the engine of your driver is to weak! I've build a prototype tapped horn with a 12" woofer with 28 N/A strong engine.
The outer demensions of the enclosure are 50x60x70 cm.
The encosure is desiged for an f3 of 48 Hz, and powered with one channel of a QSC PLX3002 the output is awesome!!
I've done an A-B test between the prototype and 2x 18" AudienceDelight B24 subs on a QSC PL6.0II.
The prototype was far winning from the B24 subs!!
 
So try a speaker with a strong engine, at the freq. which both sides of the driver are full working, you got half the engine power on a side of the driver. So in my case 14N/A a side!!
 
Jack
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DJ Vencenzo View Drop Down
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Points: 18 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DJ Vencenzo Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2007 at 5:57pm
Originally posted by tommysb tommysb wrote:

Ok here's my discussion of the horns so far! None of the other links on the page work as of yet, a work in progress they say!

Any comments greatly recieved!
http://www.lsdm.co.uk/doggspace/tappedhorns.html
 
 
dam thnaks bro!
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tommysb View Drop Down
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Joined: 24 April 2006
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2007 at 5:18pm
Ok here's my discussion of the horns so far! None of the other links on the page work as of yet, a work in progress they say!

Any comments greatly recieved!
http://www.lsdm.co.uk/doggspace/tappedhorns.html
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tommysb View Drop Down
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Joined: 24 April 2006
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2007 at 12:17pm
Hahha!

I've done some more modelling of this using the AkAbak model, actually looks like I got it way off, I've written a whole webpage about it, just gotta upload it somewhere!
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