Old School Polk Audio C4 Subwoofer - Four 6x9 Subs in Isobaric Teardrop Enclosure

Take a trip back to 1992 and see this technologically advanced automotive subwoofer up close and personal. The "C4" was a radical design at the time integrating two pairs of 6x9 subwoofers in a push-pull isobaric design. The outer two chambers are vented with a 3" x 5" port, while the center chamber is sealed. The 6x9" subwoofers have the effective piston area of 8", but the oval shape makes for a more compact enclosure.
See my overview of the Polk C4 here. Not only do I show the exterior, but I also take off the bottom panel to show how this beauty works. I also take some time to give sound demos of the C4. It is EXTREMELY difficult to capture the quality through inexpensive microphones, so I used a high-quality Sony camera mounted mic for this demo. I recommend using headphones or high-quality speakers to get the full effect...
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-BigD

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