Looks like an 8" bazoka bass tube.......LOLthis was a fun single sub set up....I can't tell the sub or size...but those are two DD Z1a's
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And i just happen to have a 500.1 for sale //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifi'd run 2 12" solo's off an american bass. 500.1.