Port noise.....HELP!!!

 

Anonymous
 
i have a brahma in a 1.8 cu ft box tuned to 30hz...the port is 4" PVC with a 90degree cupling. (port makes an L-shape)

when the sub gets loud, i can hear what i think is port noise...it doesnt sound like it comes from the cone of the sub...its like it comes from the port

its like a low pitch wistle or huffing sound

What can i do to get rid of this?
 

Silver Member
Username: Hiphopanonymous

Post Number: 119
Registered: Dec-03
the only way that i can think of is build a larger area port, with a shorter port length. i was told that the smaller the area of the port, then the more noise it will make. i don't know how to calculate this, but you can use one of them online calculators. sorry, i don't know the links to it right now.
 

Gold Member
Username: Jonathan_f

GA USA

Post Number: 1529
Registered: May-04
To get the same tuning, a larger port would actually have to be longer. Try filing the inside edges of the port to begin with. If that doesn't work, you'll need a larger port.
 

Silver Member
Username: Davids2004

Houston, TX USA

Post Number: 736
Registered: Jun-04
Also trying rounding the port off making sure no edges or anywhere around.
 

Silver Member
Username: Pat_l

Tucson, AZ USA

Post Number: 524
Registered: Apr-04
Its the 90 degree coupleing. If it couples inside the port, i is distracting the air flow. You need to get a coupling that couples out side the PVC, bigger. That way there is no air flow disruption. Because really a 90 deggree is not part of the port (tuning). Its more of a re-director.
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