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The Lost Subwoofer Series

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THE LOST SUBWOOFER SERIES: Whatever happened to JBL's Triple Chamber Bandpass Subwoofer otherwise known as the TCB-4688? 

 I personally installed several of these boxes "back in the day". This sub was an amazing piece of technology. The 4688 was mainly marketed in the Cinema series and didn't really make it into the install or touring market. I plan on writing about "The Lost Subwoofers" more often. Speaker enclosure designs are almost as interesting as the history of flight. Even today many sound guys wake up in the middle of the night with a sub design dancing in their head. I saw an episode of "Myth Busters" that involved blowing the windows out of a car with a servo-driven sub. Back to the 4688.... This was a monster of a sub. 3 chambers with two of JBL's 18" vented gap drivers sandwiched into the center chamber. I took one apart back in the 90's and took pictures and measurements. The 18's are so tightly squeezed into the center chamber it is almost like they built the boxes around the drivers. I have actually removed them for reconing a few times. 

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