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KOL
06-03-2009, 05:24 PM
I have a box that measures to be 1.75 ft^3 before displacements. It has a round port that is 4" wide & 5" long. Can anyone tell me what its tuned to?
And for future reference, how do you go about figuring it out?

john denver
06-03-2009, 05:30 PM
that's like 49hz

john denver
06-03-2009, 05:30 PM
http://psp-inc.com/

Is that the internal volume

KOL
06-03-2009, 09:17 PM
http://psp-inc.com/

Is that the internal volume

Hey, thx for the link.
Yeah, well its a rough guesstimation of the internal space.
Wow, that seams like a crazy high tuning for HT. Its an old Cerwin Vega LW-12 cabinet. I'm thinking of throwing in a new plate amp & an old PPI woofer I've got laying around. I might have to swap out the port too...hmm.

KOL
06-04-2009, 01:03 AM
Would running the port outside the box be a bad idea? I could probably get tuning around 20hz with only a couple bends, if I went this route. I wouldn't know how to calculate tuning but I'm sure test tones & length adjustments could get me close. Bad idea?