Weird ain't it?


Silver Member
Username: Hiphopanonymous

Post Number: 159
Registered: Dec-03
I have a coupe with a ported box. It houses two 12's. For some reason, when i have my windows up, it doesn't sound as loud as with my windows down. i feel like i have 2 15's when i have my windows rolled down. I would think that having my windows up would create more pressure, therefore being louder? What's going on here?

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 5687
Registered: Dec-03
this is aommon.
think of the car cabin as the outer chamber of a bandpass enclosure, where your box is the "rear" chamber.
when you open the windows, you've changing the volume of the enclosure, and thus affecting the response of the speakers.
One trick you could do is to vent the trunk of the car to outside air, such as through the floorboard, where the spare tire resides.
coupling the cabin to outside air this way generally will increase output in a vehicle like yours.

more info on the topic:

Silver Member
Username: Hiphopanonymous

Post Number: 161
Registered: Dec-03
well, i already have a vent made on the rear deck (yes, I had to cut the metal). is it because of a ported box? will a sealed box have the same effect?

Bronze Member
Username: Lbeckner

Tulsa, Ok Usa

Post Number: 53
Registered: Oct-04
He means a vent to the outside of the car not throught the rear deck.
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