I'll start off with all the necessary info.

— Trunk setup
— Two 12"s
— AB 500.1 @ 1 ohm
— Enclosure faced to fire into cabin, port on drivers side, 4 cubic feet @ 38hz
— 45's in every corner of the enclosure
— Sealed off from trunk with expanding foam
— Only heard when playing music, not tones

When at higher volumes, there is a certain 'chuff' or 'port noise' that you hear on certain notes. Its very hard to explain, but its almost as if the note is 'flexing' like the panels/windows of a car do.

The only thing that came to mind was an issue with port noise...

Any other suggestions as to what it is? Or how it can be stopped?

 

how much port?

 

whats your port area? is it flaired or rounded over? is it just heard on the lower notes?

 

68.25 sq in

mostly lower notes, but it really just depends.

all corners are 3/8" rounded over

 

im jalat

 

port is way to small for that much cone dude

 

yesss i have 78 square inchs of port and at full tilt i can hear the port noise

 

I thought the rule of thumb was 16 sq in. per cubic foot?

 

^ That rule of thumb makes no sense.

I take it your box software doesn't model port velocity? If not, use this link as a guide for minimum port area: PORT TOOLS

 

same thing happened to me haha