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View Full Version : port noise... advice?


psych0ticnemes1
06-22-2006, 08:27 AM
2.5 cubes tuned to 32 with 29^2 of port....

http://img138.imageshack.us/img138/7241/dcp00409wl.jpg (http://imageshack.us)

http://img138.imageshack.us/img138/3618/dcp00425ox.jpg (http://imageshack.us)

http://img83.imageshack.us/img83/8792/dcp00419od.jpg (http://imageshack.us)

My port makes a bit of a ruffling noise when i play low tones and such... (moving a lot of air...)

isn't 29^2 enough port area for one little 12?

YES it IS particle board!!! cheaper, this is just a test box... (besides... works well for me....)

Thanks guys..
Volenti
06-22-2006, 10:53 AM
Flare the opening of the vent, a 1/2'' round over router bit will do the job nicely.

Also make sure the sub and box are properly sealed, a vented enclosure at tuning is under more pressure than a sealed one at the same frequency.
psych0ticnemes1
06-22-2006, 10:56 AM
i wonder if i can just sand down the opening to make it more smooth? i don't own a router...
tRiGgEr
06-22-2006, 11:02 AM
How low are you playing it? 90 degree corner and rounded ends are a must for ported enclosures.
psych0ticnemes1
06-22-2006, 11:34 AM
How low are you playing it? 90 degree corner and rounded ends are a must for ported enclosures.

not too long, 10-15 seconds? i do not believe it is "port noise" from too skinny of a port, just non-rounded edges and particle board?
heyman421
06-22-2006, 12:05 PM
How low are you playing it? 90 degree corner and rounded ends are a must for ported enclosures.

ports always need to have a corner?
MrSector9
06-22-2006, 12:07 PM
you can sand the corners round.

sand the opening intoa flare and that should help
djman37
06-22-2006, 12:08 PM
2.5 cubes tuned to 32 with 29^2 of port....

http://img138.imageshack.us/img138/7241/dcp00409wl.jpg (http://imageshack.us)

http://img138.imageshack.us/img138/3618/dcp00425ox.jpg (http://imageshack.us)

http://img83.imageshack.us/img83/8792/dcp00419od.jpg (http://imageshack.us)

My port makes a bit of a ruffling noise when i play low tones and such... (moving a lot of air...)

isn't 29^2 enough port area for one little 12?

YES it IS particle board!!! cheaper, this is just a test box... (besides... works well for me....)

Thanks guys..

since it's just a test box, make another w/more port area.
tRiGgEr
06-22-2006, 04:28 PM
ports always need to have a corner?

No, but it sure doesn't hurt for avoiding port noise. If you take the time to build a nice ported box, might as well add the corner.
heyman421
06-22-2006, 04:34 PM
cool, i've gotta cruise over to the shop that's building my box cause he doesn't have a stencil for my speakers, i'll be sure to ask him about that

port's horizontal along the bottom of the box, tho, firing toward the rear, i don't know how he'd do a corner, it'd probably be right underneath the subs
tRiGgEr
06-22-2006, 05:11 PM
cool, i've gotta cruise over to the shop that's building my box cause he doesn't have a stencil for my speakers, i'll be sure to ask him about that

port's horizontal along the bottom of the box, tho, firing toward the rear, i don't know how he'd do a corner, it'd probably be right underneath the subs

You meant a corner in the port? No it does not always need a bend in the port. Only when the box is deeper than the port. Then you make it L shape. I was talking about corner angles. To reduce port noise...

Straight is fine.