I saw an interestingly built subwoofer and I'm wondering if it's a design that's familiar to anyone. It measures 17" tall, 12" wide, and 4" deep with no visible driver. There are 3 ports on the narrow 4" side and one port on the back under the plate amp. The amp looks like a Rythmik Audio A370-SE. Photos attached
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It looks like they do custom designs. http://www.rythmikaudio.com/index.html. This appears to be a band pass design.
Could be a single shallow driver or multiple small drivers in a 4th or 6th order bandpass.
Something like the above inside.
