jalat

iTrader: (6)

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?

fox_racin4

how much port?

testtones

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

jalat

iTrader: (6)

68.25 sq in

mostly lower notes, but it really just depends.

all corners are 3/8" rounded over

Father Yuli

iTrader: (17)

im jalat

PsychoAcoustics Canada

iTrader: (3)

port is way to small for that much cone dude

fox_racin4

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

fresh1

iTrader: (2)

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

Dukk

^ 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

Gurry

iTrader: (1)

same thing happened to me haha