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Changing port tune via polyfill

 

Silver Member
Username: Boopers

Lima, Ohio United states

Post Number: 151
Registered: Jul-04
I have a box that is tuned to 45hz *yeah, I know that's pretty high, but it was built for me by the audio shop I bought the sub from*, anyway, the box is about 3 ft^3 net. how much polyfill would it take to drop the tune to about 36hz or so. or would it be better to build a different box.
 

Silver Member
Username: Hiphopanonymous

Post Number: 143
Registered: Dec-03
I don't think that polyfill will change the tuned freq. of a box man, or at least I have never heard of it working before. I think you're going to have to build a new box if you want to drop the freq, or just mess around with the port.
 

Bronze Member
Username: Elecgenius

La Puente, Ca United States

Post Number: 26
Registered: Oct-04
its better to build a better box to a desired frequency. i would only recommend polyfill to drop it a minimal amount from a range of desired tuning, although i am a begginer to, so u shouldnt take my word for it i guess
 

Silver Member
Username: Insearchofbass

Post Number: 874
Registered: Jun-04
ok heres the deal to move your box tune down youd have to add three inches fiberglass insulation or three pounds polyfill for a 39.5 hz tune i wouldnt suggest going any more with the insulation that this if you have enough room in the box to do this and to keep port volocity on the borderline using a 4 inch pvc port youd have to apply no more than 225 rms watts....if you want to change your tune lower you would have to put a new port in and go wider than your port diameter
 

Silver Member
Username: Insearchofbass

Post Number: 875
Registered: Jun-04
and deeper with the port also when its wider
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