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Old School Polk Audio C4 Subwoofer - Four 6x9 Subs in ...
https://www.youtube.com/watch?v=iWNGeePHEeA
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 integrat...
Old School Stereo: Old School Polk Audio C4 Subwoofer ...
https://www.oldschoolstereo.com/2012/02/old-school-polk-audio-c4-subwoofer.html
An early 90's Polk Audio C4 subwoofer. This enclosure is one of the most unique factory car audio subwoofers of all time. It uses four 6x9 subwoofers mounted in a compound isobaric configuration. The center chamber is sealed, while both outer chambers are vented with a 3" x 5" port. Dual binding posts offer either 4 ohm stereo, 8 ohm mono or 2 ...
Old School Polk Audio C4 Subwoofer - Four 6x9's in ...
https://forum.polkaudio.com/discussion/129746/old-school-polk-audio-c4-subwoofer-four-6x9s-in-isobaric-teardrop-enclosure
I wasn't sure if this should go in the Vintage Speaker section or the Car Audio section, but since it's car audio, I decided to put it here. I just picked up this MINT 1992'ish Polk C4 subwoofer from a local CL ad. I took off the bottom panel to show off …
Old School Polk Audio C4 Subwoofer - Four 6x9's in ...
https://www.stevemeadedesigns.com/board/topic/134835-old-school-polk-audio-c4-subwoofer-four-6x9s-in-isobaric-teardrop-enclosure/
1992'ish Polk Audio C4 Subwoofer: Original MSRP was around $500. Not exactly a bass head's dream sub, but nice, clean hard hitting bass in a very small enclosure. I just picked this up off CL and it is in near MINT shape. Very cool design. Specs: Driver complement - Four 6x9 drivers monted in a isobaric push pull configuration
Amazon.com: KEF C4 Subwoofer - Black (Single) : …
https://www.amazon.com/KEF-C4-Subwoofer-Black-Single/dp/B001HX4CVC
It also has a removable power cord (standard PC power cord I believe), a phase switch, and a power switch. The sub itself sounds just awesome; Very punchy, and not boomy. I compared it against a 10" Polk, and a 12" Harman Kardon. Performance wise, the C4 defecated on both the Polk and the HK subs, despite being way smaller.
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