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Very nice build @kingpin111 !

Did you experiment with the stuffing at all? While I lined my Full Marty with memory foam mattress topper, I haven't yet installed the extra large body pillows yet. Just curious if you did any before and after listening tests or REW measurements.

Very cool subs!!

Mike
 

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@mhutchins


hi mike, in these cabs the physical size from the driver to the rear panel is fairly large, so there is a possibility of creating a standing wave inside the cab. the pillows placed in the center of the cab interfere with the development of that wave an its effects.
mr. hurd decribes the problem, provides measurements, and then a solution, with measurements, here:
http://www.hometheatershack.com/forums/ported-subwoofer-build-projects/18349-tc-1000-sonosubs.html
initially he packed several pillows at one end of his cab, but then later discovered that a single pillow located at the center of the cab knocked out the standing wave. since the air particle velocity is greatest at the center of the cab, absorption would be expected to work best in that location.
no comparison was made with other forms of absorption.
too much absorption will reduce output as josh showed here:
http://www.data-bass.com/data?page=content&id=79
 

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^^^^^^^^^^:)^^^^^^^^^^^
 
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