Originally Posted By: pmbuko
Originally Posted By: Vanorge
i did notice yesterday that it seems to be pushing more air out. before it used to suck in more than blow out. anybody know which way it's supposed to be.

Vanorge, any subwoofer that is ported must port must blow out and suck in equally. If you believe you're feeling a difference, it's most likely because your hand is not a sensitive enough measuring device. smile

This equal-blow-and-suck isn't just a rule I invented, it's physics. Allow me to explain. In order to make a sound, the subwoofer driver must move outward and inward many times a second. Every time it moves outward, it creates a slight vacuum in the box which causes air to move in through the port. Every time it moves inward, it pressurizes the air in the box and causes air to move out through the port. Keep in mind that the driver is moving in and out anywhere from 20 to 80 times a second or more.

If the subwoofer port were actually blowing more than sucking, that would mean the driver was moving further and further into the box and not returning to the neutral position.

The moral of the story is don't worry too much about the air moving through the port. If you can feel air at all, that means it's working.


i didn't measure with my hand.why would you assume that? I used a sheet of paper.I don't think i need nasa equiptment for the simple observation.

what would happen is, it used to suck in the paper more than blow it out. now it blows it out alot more, and harder to boot. i just thought it was strange.

regardless it's working well now. I calibrated it and watched gamer. i do have to set the subsonic filter to on though since i listen to movies quite loud. 100db peaks with my radio shack spl meter. for with the subsonic filter to off, it bottoms out. it made that same clack but just once.

my conclusion is it's a great sub, i just don't like that i can bottom it out at 100dbs with subfilter to off. im eager to try out the SVS ultra.

with it cutting out at 20hz its phenomenal tho.