View Full Version : I have a question.....

06-24-2011, 03:20 PM
I heard that in a chevy blazer(like mine) that placing a port 3 inches from hatch can increase in spl.
Is this true? If so is that for Burps or Spl?

06-24-2011, 03:33 PM
Boundary Gain... it's not just for Blazers.

06-25-2011, 02:35 PM
so this would work in my jeep cherokee? right now i am sub up port to driver side, i need 3-4db gain.

06-25-2011, 02:37 PM
i hear that it is no bueno to side port in an suv. everyone seems to like sub up port back.

06-25-2011, 02:39 PM
Ive been told differently, by a few people. but that's the thing, you really don't know what will render better results until you have tested all configurations.

06-25-2011, 02:45 PM
I'm sub back port back in my Grand Cherokee. It gets decently loud off 600 RMS. It's nothing crazy, but it satisfies me, for now.

06-25-2011, 02:47 PM
Try it and see. I always try different sub and port placement.

06-25-2011, 02:49 PM
yeah, plus people like lakota or snoopdan know a ton about cherokees. ask them

06-26-2011, 10:14 AM
Do the math. It's all based on wavelength and listening position.
Wavelength = speedofsound / frequency.
1120-1130 ft/sec is the range for the speed of sound, varies with humidity/temp/barometric pressure/etc.

You want direct and reflected to be coherent at you metering location.
Where you place the sub(s) determine what room modes you excite
Where you listen determines which room modes you hear/measure

06-26-2011, 11:40 AM
Testing > theory

For the distance from an interior wall, it depends. Mine is 4.5 inches.