thanks in advance for any help.

Net Volume Box = 3.0 cubic foot

Desired Port freq. ( Fb ) = 50 Hz

Using 2x 4" i.d. ports

my answer: length of vent = 5.0 inches

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- Thread starter Scott L
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thanks in advance for any help.

Net Volume Box = 3.0 cubic foot

Desired Port freq. ( Fb ) = 50 Hz

Using 2x 4" i.d. ports

my answer: length of vent = 5.0 inches

GM

I get 4.88 inches so I would say you will be OK at 5 as at least you have some spare to trim if necessary. Tuning seems dangerously high for such a big box, what are you building?

Answer:

Since this is my most favourite forum, I thought I'd give as much info as possible. This (pair) of enclosures is the upper bass/low mid section of a full-scale assault-type of sysytem. The designated range is from 60-250Hz.

Each enclosure will house 2) 12" pro-type woofers model Eminence HO4012.

There is a woofer on the front and exactly opposite it, on the back, in a reaction cancelling arrangement. Originally, the plan called for each driver in it's own encloure of 1.5 ft^3 w/ 2x4" vents, but this required vents much too long to fit inside a reasonable enclosure. A lightbulb in my head finally lit up, and I decided a common volume of 3 cubic feet, and just one pair of 4" vents for the entire volume. The measured woofer specs are Fs 46; Qts .35

Vas 2.4 I think i'll opt to place the vents on the rear, as I really don't want to look at them. The crossover slopes are 24/db/ oct high-pass and 48 db/ oct low-pass. Since the high pass is 60, and the vents are tuned to 50, I am not so concerned with vent compression, if even I need be ?

All comments and criticisms welcome.

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