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How close can I get port wall to rear wall before problems


jfoodstamp

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Posted

I've been agonizing over this box design and I finally have it all figured out until this..... My port Width is 9 inches and my rear port wall is only 6.5 inches from the rear wall. Will this cause any problems or should I trim back my length of port?

Posted

Yes.

Your port wall needs to be at least the width of the port away from the rear wall.

That being said a lot of people's definition of "music" is a clipped 30 hz sine wave with some 80 IQ knuckle head grunting about committing crimes and his genitals.

Posted

Is this a three common wall port, or is it a center port with two common walls?

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Posted

If the port is on the side of the box (say to the far right sharing 3 walls of the box), it needs to be minimum of the port width off the wall.

If the port is in the middle with a chamber per side (a center port), you can get away with half the port width (since it splits to each chamber).

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Posted

It will be a 3 common wall ported box. I'll just have to tweak things around a little bit. thanks again

Posted

I would always go atleast twice the width of the port to reduce the chances of affecting tuning. If you only space at the width of the port then this could cause the air between the box and the wall of the vehicle to function as added port length.

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Posted

Hugh..... Could that help benefit me if Inneed to bring tuning down a little bit?

Posted

If the port is on the side of the box (say to the far right sharing 3 walls of the box), it needs to be minimum of the port width off the wall.

If the port is in the middle with a chamber per side (a center port), you can get away with half the port width (since it splits to each chamber).

So if you you're doing a 2 common wall center port and your width is 10 inches, you can be 5 inches away from the rear wall and still be ok?

If this is correct, my life just became much easier.....

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Posted

Hugh it's not probably not enough of a difference to depend on. I will probably end up just tuning a little higher like 35hz

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