Which type of enclosure

adelphia83 · 11th May 2011, 01:22 AM

Can anyone tell me what type of enclosure I should use for an Audiobahn Alum12N? It has the following T/S parameters:

Fs 24.4 Hz
Qts 0.56
Qes 0.51
Qms 4.9
Vas (Cu. Ft.)2.66 Cu.Ft
Re 5.4 ohms
Le 2.7 mH
Mmd 186 Grams
Xmax +/-14 mm
RMS 1000 Watts
Sd 0.049 M2
Freq. Resp. 18Hz-500Hz
Efficiency 96.4 dB

Ideally I'd like to use a ported box, tuned to around 38hz, 1.5 cf per chamber, but have no idea how the driver would respond in it. Any suggestions?

Ron E · 11th May 2011, 02:05 AM

Quote:

Originally Posted by adelphia83

Can anyone tell me what type of enclosure I should use for an Audiobahn Alum12N?

Qts 0.56
Qes 0.51
Efficiency 96.4 dB

Ideally I'd like to use a ported box, tuned to around 38hz, 1.5 cf per chamber, but have no idea how the driver would respond in it. Any suggestions?

Well, Qes cannot be less than Qts, and if you reverse them, the calculated sensitivity is 86dB. These want a sealed box, and 1.5 cubes is about right.

adelphia83 · 11th May 2011, 12:14 PM

Would I gain anything using a ported enclosure, around the same volume (~1.5cf), ported to say 38hz?

Or would this adversely affect sound quality?

Ron E · 12th May 2011, 02:37 AM

It will boom. You might like this. A 4" flared port ~13" long should be considered minimum. If you don't like it, stuff a sock in the port...

adelphia83 · 12th May 2011, 11:52 AM

I downloaded WinISD and entered the speaker parameters in. (Qts should have been 0.47 btw, all other parameters are correct).

It shows a 1.4cf sealed box to have an F3 of 37.14hz, the rest of it is fairly linear, where it flattens around 62 hz at 0db gain.

The ported box at 1.45cf tuned to 38hz peaks around 50hz at +4.9db. Is this the "boom" you describe, meaning it is very loud over a narrow frequency range? How "boomy" would this be? Gain falls off to 0db around 37.5hz, and F3 is near 33.5hz.

Recipe for disaster, or does it look like this ported enclosure may have decent sound quality? Sorry for the beginner questions! I suppose if I don't like it, I could just close off the port to make it sealed...

djQUAN · 12th May 2011, 12:13 PM

that would be in an open area without any echo. When you put it in the car, cabin gain comes into play and the lows get boosted.

11th May 2011, 01:22 AM	#1
adelphia83 diyAudio Member Join Date: Sep 2008	Which type of enclosure Can anyone tell me what type of enclosure I should use for an Audiobahn Alum12N? It has the following T/S parameters: Fs 24.4 Hz Qts 0.56 Qes 0.51 Qms 4.9 Vas (Cu. Ft.)2.66 Cu.Ft Re 5.4 ohms Le 2.7 mH Mmd 186 Grams Xmax +/-14 mm RMS 1000 Watts Sd 0.049 M2 Freq. Resp. 18Hz-500Hz Efficiency 96.4 dB Ideally I'd like to use a ported box, tuned to around 38hz, 1.5 cf per chamber, but have no idea how the driver would respond in it. Any suggestions?

12th May 2011, 02:37 AM	#4
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	It will boom. You might like this. A 4" flared port ~13" long should be considered minimum. If you don't like it, stuff a sock in the port... __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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11th May 2011, 12:14 PM	#3
adelphia83 diyAudio Member Join Date: Sep 2008	Would I gain anything using a ported enclosure, around the same volume (~1.5cf), ported to say 38hz? Or would this adversely affect sound quality?

12th May 2011, 11:52 AM	#5
adelphia83 diyAudio Member Join Date: Sep 2008	I downloaded WinISD and entered the speaker parameters in. (Qts should have been 0.47 btw, all other parameters are correct). It shows a 1.4cf sealed box to have an F3 of 37.14hz, the rest of it is fairly linear, where it flattens around 62 hz at 0db gain. The ported box at 1.45cf tuned to 38hz peaks around 50hz at +4.9db. Is this the "boom" you describe, meaning it is very loud over a narrow frequency range? How "boomy" would this be? Gain falls off to 0db around 37.5hz, and F3 is near 33.5hz. Recipe for disaster, or does it look like this ported enclosure may have decent sound quality? Sorry for the beginner questions! I suppose if I don't like it, I could just close off the port to make it sealed...

12th May 2011, 12:13 PM	#6
djQUAN diyAudio Member Join Date: May 2004 Location: manila	that would be in an open area without any echo. When you put it in the car, cabin gain comes into play and the lows get boosted.

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