Question about Rockford Fosgate Punch 500S Car Audio Amplifier
If it is a single 12" the rule seems to be 1 cubic foot of airspace. Fill a smaller box with fiberfill
and it thinks it's bigger.
If you want to compensate for the volume taken up by the woofer, you can use the following approximations. Keep in mind that these are for 'normal' woofers. If you're using a competition woofer with a huge frame and magnet structure, refer to the manufacturer for the actual displacement volume of the woofer. Even if you're not using competition woofers, most high quality manufacturers provide this spec in the woofer's datasheet. 8 inch .03 ft3 10 inch .05 ft3 12 inch .07 ft3 15 inch .10 ft3 Also noting that a box that is 12" X 12"X18" should get you in the 1 cu ft range but you may need
to go 14X14X14 or 1.3 cu ft to be able to get the speaker into the box-clearance!
Dont use plywood! It flexes. Use MDF and use a silicone sealer like window or door seal
to make it air-tight. To get more audio out of a small amp, add a port however the calculation
of port size is a bit scarse.
Here is the site I use. Maybe you can write down the www and go view it on someone's computer.
See # 110 on the right side pane. I love this site for all calculations.
Posted on Mar 11, 2011
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Posted on Jan 02, 2017
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