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Date: August 03, 2003 at 22:05:43
From: Brian, [206-48-63-219.caribsurf.com]
Subject: Re: Multimedia PC 4 "Subwoofer


>Using these figures I've obtained a negative box
>volume for a sealed box (Qtc=0.7)

That's because you cannot create a sealed alignment for any given driver where Qb is less than or equal to the driver's Qts.


>I just want to know if the box calculation posted for
>sealed, ported, 4th and 6th order are valid for such
>an small speaker.

Yes, they're all valid.


>I would like to hear any sugestion about which one
>suit better for a PC Multimedia application.

I really can't recommend going to trouble of building a multimedia subwoofer with a 4" driver, particularly THAT 4" driver, as the Fs and Qts figures are too high. Look for a decent 8" DVC driver - that should give you small enough box size. It probably won't be shielded, but that's not too much of a worry if the subwoofer is placed away from the PC monitor (which is normally the case).


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