Question about Alphasonik Mayhem PSW912 Car Subwoofer
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Posted on Jan 02, 2017
For a ported enclosure with room for a port, you're going to need a box with about 3.0 CuFt internal volume. Using 3/4" material and outside dimensions, this translates into a box 25"(w)X18"(h)X15"(d) giving you 3.03 CuFt allowing a little volume for the sub and port displacement. For a tuned frequency of 38Hz, you'll need a rectangular port 2"X6" and 4.6" in length. A round or cylindrical port for the same tuning frequency would be 4" in diameter and 4.9" in length. Increasing the port length will lower the tuned frequency.
There's excellent volume and port calculators on The12v.com web site. I'd recommend that you browse some of the "box-building" information before you begin your build. The DIY Subwoofer site also has some great resources.
Keep in mind that a ported enclosure will tend to produce the loudest bass notes very close to the tuned frequency. So tune it higher or lower according to the music you will be playing.
Hope this helps.
Posted on Jun 11, 2009
xmax is 1.5mm one way
frequency should be somewhere between 19 and 25htz
myself personally if you have the wattage i would go around 2.25cuft but this one should sound fine around 1.5 or 1.75cuft bigger boxes boom...
Posted on Feb 08, 2010
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