How does this work?

[95ZJ 10+ year member]

http://cgi.ebay.com/Alpine-Type-R-12-SWR-1242D-Sub-HI-TECH-BOX-ENCLOSURE_W0QQitemZ250046201179QQihZ015QQcategoryZ32823QQrdZ1QQcmdZViewItem?hash=item250046201179

I understand the tube concept, but why a port when it's such a small enclosure?

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[acold7dusta 10+ year member]

its a band pass

 

[Immacomputer 10+ year member]

It's a 4th order bandpass.

EDIT: I lose. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[95ZJ 10+ year member]

Ah, ok.

 

[yacob.naif 10+ year member]

harmon kardon uses a similar design for their computer speakers' subwoofer