calculating port length and diameter

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: May 26, 2006 at 9:54 AM / IP Logged

oxygen65 wrote:

yea i looked at that and tryed to put all the info in and to tune it to 32 mhz it said to have like a 7 inch port like 12 inches long,and that seems a little strange in a box that is 30 inches long

According to the port calculator on this site, 14.15cuft tuned to 32Hz with a 7" port requires the port to be 2.04" long. 12" length tunes the enclosurre to 20.7Hz.

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oxygen65

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Posted: May 26, 2006 at 11:27 AM / IP Logged

alright well i think i am doing somethin wrong when i put the numbers into there. so can anyone help me out and figure out how big the square port should be and how long to tune it to 32 mhz

DYohn

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Posted: May 26, 2006 at 11:38 AM / IP Logged

Do you want to build a square port or a slot port that runs the entire length of one wall? If so, which wall?

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oxygen65

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Posted: May 27, 2006 at 8:19 AM / IP Logged

i was thinking a slot port that goes right in the middle for both subs, so it looks like one super huge port.

DYohn

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Posted: May 27, 2006 at 9:51 AM / IP Logged

oxygen65 wrote:

i was thinking a slot port that goes right in the middle for both subs, so it looks like one super huge port.

OK, so how "tall" and "wide" will the slot opening be? I need to know your intended slot dimensions before I can suggest its size. The internal dimensions of the opening is best, and I assume you'll make this out of the same 3/4" MDF as the rest of the enclosure?

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oxygen65

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Posted: May 29, 2006 at 5:37 PM / IP Logged

Well i want the port the be as tall as the box is and the width of it could be around 8 to 10 inches

killer sonata

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Posted: May 29, 2006 at 6:13 PM / IP Logged

that is a huge frickin port. 8 to 10 inches is way too wide for a port unless it is like 4-8 ports joining into 1.

DYohn

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Posted: May 29, 2006 at 6:27 PM / IP Logged

OK, assuming you build your port from 3/4" MDF, if the outside dimensions are 25" (the height of your proposed enclosure) X 8" wide, this means the opening would be 23.5" X 6.5". To tune your enclosure to about 32Hz, the slot port needs to be about 16.75" long (your enclosure ends up about 13.3 cuft.)

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killer sonata

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Posted: May 29, 2006 at 6:38 PM / IP Logged

DYohn wrote:

Oh wow that is huge. I hope that box is going into a van or truck of some sort. I dont even think you need a box that big for the MTX jackhammer.

oxygen65

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Posted: May 29, 2006 at 8:09 PM / IP Logged

so making the 1 port 6.5 inches wide and 16.75 long it will be tuned to 32mhz?

could you just tell me how you figured that out becuse i cant.

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