Audiobahn 34 Inch Subwoofer - Anyone ever build a box for one? - Page 2 - diyAudio
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Old 17th April 2008, 05:21 PM   #11
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Location: Doerun, GA
Thiele/Small parameters for AWT-34X:

Fs 13.6Hz
Qts 0.968
Qes 1
Qms 11.65
Vas 743 Liters (~26 cu ft)
Re 1.95 ohms
Le 1.15mH
Xmax +/- 30mm
Pmax 5000 watts

Those parameters donít suggest happiness in a ported box.

The manual suggests 18-22 cu ft.

In 18 cu ft sealed, Qtc would be around 1.5 with Fc around 20Hz before considering the car's influence.

Is the surround pleated foam?
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Old 17th April 2008, 05:33 PM   #12
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The foam is accordian edge, not the foam. Looks like the early 18" Cerwin Vega type surround. It is close to the same style as what is on my Clarion 32" subs too. The surround is made of a fabric, not foam... Here are some specs that I found on the internet. Unsure how accurate they are, but the thread said they are for the AWT-34... Thanks for all the help........
Here are the Thiele small parameters

Fs 13.6Hz
Qts 0.968
Qes 1
Qms 11.65
Vas 743 Liters
Re 1.95 ohms
Le 1.15mH
Xmax ?????
Pmax 5000 watts


Here are the calculator values:
Driver : Audiobahn AWT34X
Number of drivers : 1
Box type : Closed
Box size : 123.114 ft^3 Optimum volume


Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 1.78 1.78
25.00 1.48 1.48
30.00 1.13 1.13
35.00 0.86 0.86
40.00 0.68 0.68
45.00 0.54 0.54
50.00 0.44 0.44
55.00 0.37 0.37
60.00 0.31 0.31
65.00 0.27 0.27
70.00 0.23 0.23
75.00 0.20 0.20
80.00 0.18 0.18
85.00 0.16 0.16
90.00 0.14 0.14
95.00 0.13 0.13
100.00 0.11 0.11



At 5.000 ft^3 sealed
Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 -6.09 -6.09
25.00 -0.13 -0.13
30.00 5.32 5.32
35.00 8.00 8.00
40.00 7.09 7.09
45.00 5.57 5.57
50.00 4.38 4.38
55.00 3.53 3.53
60.00 2.90 2.90
65.00 2.43 2.43
70.00 2.06 2.06
75.00 1.77 1.77
80.00 1.55 1.55
85.00 1.36 1.36
90.00 1.20 1.20
95.00 1.07 1.07
100.00 0.96 0.96




At: 10.000 ft^3 sealed
Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 0.27 0.27
25.00 5.08 5.08
30.00 5.60 5.60
35.00 4.45 4.45
40.00 3.42 3.42
45.00 2.68 2.68
50.00 2.14 2.14
55.00 1.75 1.75
60.00 1.46 1.46
65.00 1.24 1.24
70.00 1.06 1.06
75.00 0.92 0.92
80.00 0.81 0.81
85.00 0.71 0.71
90.00 0.63 0.63
95.00 0.57 0.57
100.00 0.51 0.51



At: 15.000 ft^3 sealed
Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 2.58 2.58
25.00 4.71 4.71
30.00 4.00 4.00
35.00 3.05 3.05
40.00 2.35 2.35
45.00 1.85 1.85
50.00 1.49 1.49
55.00 1.23 1.23
60.00 1.03 1.03
65.00 0.87 0.87
70.00 0.75 0.75
75.00 0.65 0.65
80.00 0.57 0.57
85.00 0.51 0.51
90.00 0.45 0.45
95.00 0.40 0.40
100.00 0.36 0.36



At: 20.000 ft^3 sealed
Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 3.18 3.18
25.00 3.96 3.96
30.00 3.15 3.15
35.00 2.39 2.39
40.00 1.85 1.85
45.00 1.46 1.46
50.00 1.18 1.18
55.00 0.98 0.98
60.00 0.82 0.82
65.00 0.70 0.70
70.00 0.60 0.60
75.00 0.52 0.52
80.00 0.46 0.46
85.00 0.41 0.41
90.00 0.36 0.36
95.00 0.32 0.32
100.00 0.29 0.29



At: 25.000 ft^3 sealed
Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 3.21 3.21
25.00 3.41 3.41
30.00 2.65 2.65
35.00 2.01 2.01
40.00 1.55 1.55
45.00 1.23 1.23
50.00 1.00 1.00
55.00 0.83 0.83
60.00 0.69 0.69
65.00 0.59 0.59
70.00 0.51 0.51
75.00 0.44 0.44
80.00 0.39 0.39
85.00 0.35 0.35
90.00 0.31 0.31
95.00 0.28 0.28
100.00 0.25 0.25



All qtc values are above1.00, and above 2.00 for the 5 ft^3


Driver : Audiobahn AWT34X
Number of drivers : 1
Box type : Vented
Box size : 500.920 ft^3 optimum volume ported box. not recommended
Tuning frequency : 5.45 Hz
Vent : 1 vent(s)
-0.7 in length for each
4.0 in round


Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 1.98 1.98
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Old 17th April 2008, 10:38 PM   #13
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Quote:
The surround is made of a fabric, not foam...
It was obvious in the picture that the edge is pleated, and I couldn't imagine it would be pleated foam...

The .pdf manual I have is for the AWT10/12/15/18/34X, and generically specifies a 2" foam surround. Given the low production/handmade nature of the 34" (it feels wrong to type '34" woofer'), they may all have pleated cloth surrounds. You know how literature can be incomplete or slightly wrong.

Just be aware that these specs could be off a bit if the models were updated during production.

I'd be happy to email the .pdf if my dial-up can handle the file size.
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Old 17th April 2008, 10:43 PM   #14
tinitus is offline tinitus  Europe
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I searched fore this driver, and all pictures showed insanely huge ordinary half roll surround...not at all like the driver shown here ?
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Old 18th April 2008, 12:27 AM   #15
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Just as a piece of nostalgia, this post reminds me of something in the past. I think I recall seeing a 36" Hartley(?) some 35 years ago for domestic/PA use.....that was before cars even HAD audio!!!
And remember : "Nostalgia isn't what it used to be!"
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Old 18th April 2008, 04:33 AM   #16
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I remember an experiment driver I made a few years ago. It had a flat 3'X4.5' rectangular pneumatic driven diaphragm. It had an unreal 12" XMAX..... The diaphragm used a series of "lanyards" with bearings used in skateboards to allow for positive tracking through a rectangular tunnel that measured 3.5X5'. I might have some pics around somewhere.

Letís just say that it wasnít much to listen too but would make you sick to your stomach if you were in a small room with it. Too bad I could not legal to use it in a SPL comps back in the day......


I have always loved big subs......
Oh the memories!


BTW: a VLX400 is a good choice.
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Old 18th April 2008, 07:18 PM   #17
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I remember the Hartley. They were 24". Sometimes they pop up on Ebay every now and then. They still bring a good price. I was outbid on them fairly quick several times. Still want one...

On the "Diaphragm speaker" , I would like some pics of that if you have some. Sounds neat. Kinda like the one that was built on Mythbusters that was run off of the driveshaft. Forget what size it was, but it was big, and did 160+db with 30hz or something like that... Put up some pics Jonny..........
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Old 19th April 2008, 01:04 AM   #18
TheMG is offline TheMG  Canada
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Quote:
Originally posted by tomtomjr
On the "Diaphragm speaker" , I would like some pics of that if you have some. Sounds neat. Kinda like the one that was built on Mythbusters that was run off of the driveshaft. Forget what size it was, but it was big, and did 160+db with 30hz or something like that... Put up some pics Jonny..........

51" diameter, 161.3dB at 16Hz
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Old 19th April 2008, 02:32 AM   #19
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not to hijack this thread but my original idea was to use a crank shaft but was cautioned that in theory would not work properly because a crank shaft speeds up and slows down depending on the position of the "rod" on the crank. It slows to 0 @ TCD speeds up until its maximum speed at 15 deg. then slows to 0 at again at 50 deg and reachs max speed again at 75 degrees........ was told the because of the speeding up and slowing down the wave it would produce would not be good.

I have tried all sorts of experimental BS......I wonder how many peeps around hooked 16 speakers directly to a 120 volt AC household outlet!!!!!

(BTW, it makes something like 15K-25K (cant remember) watts @ 4 ohms @ 60 HZ)
Im busy with the car.....speedweek is only 4 months away but promise I will look for the pics soon.
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Old 19th April 2008, 03:55 AM   #20
jol50 is offline jol50  United States
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I read about some rotary drivers that were on some huge machine, like a draw bridge or whatever. They canceled out the sound to make it quiet.
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