Dual chamber ported sub? - Page 2

RJ · 18th May 2005, 04:05 AM

Doubling the ports more than doubles the length.
If the box is big enogh it might not be a problem.

kelticwizard · 18th May 2005, 04:43 AM

I can't see any reason you cannot design for six ports instead of 3. Howevr, if it is port volume you are after, why not just make 3 ports of a larger diameter?

Remember, in any kind of reflex box-the ports do not count as part of the box volume. The volume of the ports, theoretically, should be subtracted from the total box volume in your calculations. Most of the time the ports consititute fairly negligible loss of box volume, so we can ignore this. But if the ports start occupying 15% or more of the total box volume....

elambert · 18th May 2005, 12:40 PM

I do understand about the port volume being added to total internal volume of the box. With the last box that is why I went with an external port. Fitting 3 4" ports inside the box was a bit tricky, plus I kind of liked the odd look of the external ports.

18th May 2005, 04:43 AM	#12
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	I can't see any reason you cannot design for six ports instead of 3. Howevr, if it is port volume you are after, why not just make 3 ports of a larger diameter? Remember, in any kind of reflex box-the ports do not count as part of the box volume. The volume of the ports, theoretically, should be subtracted from the total box volume in your calculations. Most of the time the ports consititute fairly negligible loss of box volume, so we can ignore this. But if the ports start occupying 15% or more of the total box volume.... __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

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18th May 2005, 04:05 AM	#11
RJ diyAudio Member Join Date: Oct 2004	Doubling the ports more than doubles the length. If the box is big enogh it might not be a problem.

18th May 2005, 12:40 PM	#13
elambert diyAudio Member Join Date: Apr 2005 Location: Warner Robins GA	I do understand about the port volume being added to total internal volume of the box. With the last box that is why I went with an external port. Fitting 3 4" ports inside the box was a bit tricky, plus I kind of liked the odd look of the external ports.

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