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Date: March 30, 2002 at 23:45:15
From: Brian Owens, [spider-wm022.proxy.aol.com]
Subject: Re: Sub/amp configuration questions (lots of them)

URL: my webpage


Using common airspace is not a problem, but it should be double the required volume for a single sub. You could decrease the required volume up to 20% and use 1 lb. of polyfill per each 1 ft^3 to get the same effective volume.

If you make the box too small, the frequency response will not be as low. Too small, increases power handling in some cases. Sometimes it seems to increase the power handling excursion wise, but too much power can still damage the speaker from thermal meltdown of the voice coil. If the box is too big, the woofer can be driven past it's max excursion easier, and this will also cause damage. Of course damage is usually only caused when the box is way too big and the woofer is being driven too hard, or is very small and you input more power than the driver is rated to handle. . .

I would wire the coils on each sub in series, then parallel the 2 subs to the amp in bridged mode (probably Left + and Right - on the amp, but check the manual). That would be 4 ohms mono, which is the equvilant to a 2 ohm load in stereo mode.

Checkout this site. You would wire your subs like the first picture for a 4 ohm load:

http://www.jlaudio.com/tutorials/wiring/2dvc.html

For sub wiring in parallel:
R total = 1/(1/r + 1/r + . . . + 1/r)

For series wiring:
R total = r + r + . . . + r

Anymore questions, let us know. . .

Brian


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