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Discussion Starter · #1 ·
I have one of these that i would like to build a small sealed box for. It will be mated to four W3-1364SA for my computer speakers.

I would like some help in choosing a volume for the box. I do not have any testing equipment to determine the actual spec of the drivers. Anyone with experience that could send me on the right way would be a great help.

SENSITIVITY 1W/1m 89 dB
FREQUENCY RESPONSE 27-200 Hz
FREE AIR RESONANCE 27 Hz
VOICE COIL DIAMETER 49.5 mm
AIR GAP HEIGHT 8 mm
RATED POWER INPUT 250 W
MAXIMUM POWER INPUT 500 W
FORCE FACTOR, BL 14.15 TM
MAGNET WEIGHT (67.5oz) 1860.10 g
MOVING MASS 115.0009 g
FERRO FLUID ENHANCED No
SUSPENSION COMPL. 297.4229 uMN-1
EFFEC.PISTON AREA 0.0460 M2
Levc 2.71 mH
Zo 46.13 ohm
X-max 12 mm
Vas 89.37 Litr.
Qts 0.29
Qms 4.21
Qes 0.31

Thanks for your time!

Wayne
 

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Welcome to the forum. :)

Here is the white paper on the driver http://www.tb-speaker.com/detail/1208_03/w8q-1071f.htm

I will run it in winisd and see what it suggests for sealed.. and ported..

Sealed
Qtc. .702
Fsc. 58.73
Volume 22.10 lit.

Ported
Tuning Freq. 31.35
Volume 37.96 lit.
4 inch round port 22.67 inches long

These are the default suggestions from WinISD
 

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Discussion Starter · #3 ·
thanks for running the numbers... a 22 inch port would hardly fit in that box...i will run sealed. did winisd show the f3 of the sealed box?
 

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Mike is right as usual. :)
A 3 inch port has the first resonance at 554hz but you might get some vent noise at full excursion.

3 inch port 12.21 inches long tunes the box to 31.34hz
3.5 inch port 17.04 inches long tunes the box to 31.34hz

Matt
 

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You should port the sub it is not suitable for sealed use in the subwoofer range. It's xmax is far too low for a sealed subwoofer. You can use an elbow or a square port and turn it that way.
 

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If box size is an issue then 1.5 cu.ft. tuned to 40 hz with a 4" port 11" long would be the best compromise. As you can see, sealed would have a much less output. For ported, the default hi pass filter on the amp is 17.7 hz and much too low, the sub would bottom out. It would need to be changed to 25 hz with the resistor modification as stated in the amp's documentation.

tb.JPG
 

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This sub is for a computer set up so size is sort of an issue. How large would a horn or tapped horn be?
With this woofer, not that small but not as bad as some drivers I've played with. Depends how much space you have. My dual W8Q horn project in the ported area is 600L+ in size, but then again it's a 16Hz horn for home theater. With the time I had for playing in Hornresp this morning I got a 20Hz horn out of one of these that clocks in at 400L. Still pretty big... I might try and shrink it a bit later when I'm off work.

You're probably better off porting this one though. A 30Hz horn might do the trick and keep the size down (and get good and loud), but then you have to decide if you really want it to stop at 30Hz.
 
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