
Originally Posted by
Jay Pace
The alesis mk2s sounded much better if you plugged the ports. The bass was much tighter, and there was less of it. Without plugging the ports you got a resonant one note bass noise.
Plug the ports and the air being pushed around by the driver can't escape.
You need to port bigger speaker boxes or the pressures inside will push the box to bits. Kind of like if you get a folded horn bass bin, the driver channels the pressure wave throught the horn and it produces bass like a trumpet.
Its a loud but inaccurate sound, and necessary on high powered speakers to stop huge pressures building up inside the box. If there are no ports the driver will compress the air in the box as it pushes in, then cause a vacuum as it pushes out. This puts strain on the box, and the forces in the box could prevent the driver from moving freely as it would be fighting against compressed air and the forces of a vacuum.
This jibberish may or may not make sense. I'm not sure if I'm explaining myself well.