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Check my port length BPD 1803 (1 Viewer)

Craig Woodhall

Supporting Actor
Joined
Jul 11, 1999
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590
Hey, i finished my box for my BPD 1803.. After I subtract all the bracing/driver/etc i have a net enclosure of 11.302 ft3. I want to tune it to 17.5hz and the inside diameter of the sonotube port I will be using is 8.25". I come up with a port 35" long, does that look about right? How do you account for the volume the port itself takes up?
Hopefully the airspeed won't be too high and the enclosure isn't under-ported, it would have been too difficult to fit a 10" port in.

Craig
 

Pete Mazz

Supporting Actor
Joined
May 17, 2000
Messages
761
The tuning is right.

You have to deduct the volume of air that the port takes up, which would be Pi*R^2*Height. If it affects the overall volume by a lot, then re-do the tuning based on the new volume.

Pete
 

Craig Woodhall

Supporting Actor
Joined
Jul 11, 1999
Messages
590
Pete,

the sonotube im using for a port is only 1/8" thick, so you mean just subtract the material of the port inside the box, not all the air volume inside the port?

Craig
 

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