Port shape round vs ported question

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02-13-2009, 07:37 PM

#11

420guy

500 Watt CAFz'r

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Quote:

Originally Posted by jalat

1.1 cubic feet per chamber @ ~34.5hz

32"w x 18"d x 13"h

So the 2 port walls running front to back will be 15" plus the 3/4" for the baffle right? So if I make a double baffle do I make the 2 pcs 14 1/4 " to compensate for the extra baffle width? Again awesome work man. BTW this is nothing close to what was recommended by the shop or what bass box and winisd are saying.

Thanks again

Nick

02-13-2009, 07:37 PM

#12

jalat

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Quote:

Originally Posted by loudtdi

Smaller ports are fine (to an extent) if u use multiples. If you are trying to move too much air through a too small port the venturi effect of the air movement will get messed up and thats when you get chuffing/farting/port noise (pick your own word). Multiple smaller ports coupled together (close proximity to each other) will split the load of air and get the job done as efficiently as a larger port.

There is 17.25 square inches of port per chamber. The general rule is 13-15 square inches per cubic foot.

02-13-2009, 07:38 PM

#13

jalat

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Quote:

Originally Posted by 420guy

Thanks again

Nick

i modeled it up in WinISD and got a fairly nice response on the low end of things. i mean its a bit peaky, but its a ported enclosure

02-14-2009, 11:00 PM

#14

BigRedGuy

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Quote:

Originally Posted by Dukk

Area. Keep the area of the vent the same and the length will be the same in 99% of the cases.

I'm kind of surprised at their recommendation. Very few people (ie nobody) use 2.5" ports an 1cuft at 30hz sounds really generic. Sounds like something off of a manufacturers spec sheet.
Good on you to be modelling it on WinISD.

Good call on the spec sheet Paul, that's exactly where we got the info....I'd put the sheet up here but it is a little blurry out of the box....must have been printed in the same room where they test woofers.....