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crazyray · 11-20-2002, 10:57 AM

JayMan, I ASSUME that the current enclosure was properly designed for the subs that are in it. If that is true, it is HIGHLY unlikely that a ported version of the same box would improve the sound you are getting. This stuff is (fortunately) no longer an area ruled by trial and error or "witchcraft". Science can actually help!

Subs should have specifications with them. The key ones for our purposes are Vas, Fs, Qts, and Qes. You can plug the specs into this free windows program and get an idea what a suitable box type and volume would be...

http://www.mobiledynamics.com/main/t...special.html#F

If not available there, try here:

http://www.nightstormer.com/software.htm

Look along the left side of the page for free box design software. For car audio, a sealed box is usually designed for a system Q of about 0.8 to 0.9.

Using dacron polyfill inside a sealed sub box is likely to help. Use about 1 pound per cu ft of internal volume. Be sure to place it in the box in such a way that it does not impinge on the speaker cone.

11-20-2002, 10:57 AM	#4 (permalink)
crazyray Registered User Join Date: Oct 2001 Posts: 991	JayMan, I ASSUME that the current enclosure was properly designed for the subs that are in it. If that is true, it is HIGHLY unlikely that a ported version of the same box would improve the sound you are getting. This stuff is (fortunately) no longer an area ruled by trial and error or "witchcraft". Science can actually help! Subs should have specifications with them. The key ones for our purposes are Vas, Fs, Qts, and Qes. You can plug the specs into this free windows program and get an idea what a suitable box type and volume would be... http://www.mobiledynamics.com/main/t...special.html#F If not available there, try here: http://www.nightstormer.com/software.htm Look along the left side of the page for free box design software. For car audio, a sealed box is usually designed for a system Q of about 0.8 to 0.9. Using dacron polyfill inside a sealed sub box is likely to help. Use about 1 pound per cu ft of internal volume. Be sure to place it in the box in such a way that it does not impinge on the speaker cone. Last edited by crazyray : 11-20-2002 at 11:16 AM.