DIY 8" design help... - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 06-14-2007, 10:40 AM - Thread Starter
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So I'm considering a DIY sub for my relatively small office (~11'x12'x12'). It will be used in a 2.1 configuration and primarily (95%) for music. The idea is to build a box that is fairly small. I already have a driver that I would like to use, unless it really will not work. It is an 8" sub that I bought for a car audio project that I ended up not using. Anyways, I'm thinking about maybe a small sonotube or small sealed box. The driver is a DDaudio 1508, it's a little beast. I need some ideas for a small box design, it needs at least a small footprint.

DDaudio 1508 " subwoofer specs

Voice Coil Diameter-----------------------2.0"
Magnet Weight----------------------------100 oz
Power Handling RMS/Music/Peak------450/900/1800
Suspension--------------------------------55 mm
Nominal Impedance----------------------4.0 Ohm
DC Resistance-----------------------------3.4 Ohm
Free Air Resonance-----------------------30 Hz
Sensitivity----------------------------------85.5 dB
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post #2 of 4 Old 06-14-2007, 10:49 AM
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For an office sub it should be fine. DDAudio has specs for boxes with 40Hz tuning - you may not want a lower tuning lest you draw the ire of your coworkers.
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post #3 of 4 Old 06-14-2007, 10:50 AM - Thread Starter
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HAHA yeah sorry, home office...
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post #4 of 4 Old 06-16-2007, 12:59 PM
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Do they provide Thiele-Small parameters ...

Its all nice and dandy to know how much power the CV can sustain and knowing the motor weight. Thiele-Small parameters are much more important when designing a box.


FS of 30Hz,with the motor it uses I could estimate BL from 12-15.With a small piston to move you should be fine in a box from 0.5-1cu ft sealed. Just a crude guess.

With T-S parameters and winISD Pro you can model the unit and get a realistic prediction.

Ask yourself mortal , do you have as much displacement as me ? The answer is no unless you have a Windmere fan sub.
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