coupled cavity sub

i've built a coupled cavity ported sub that i've seen on a subwoofer plans website,, and the result is remarkable, although i did not use the recommended PD 184 driver,, because its not available here in the philippines. instead i used a KONZERT KW3000 subwoofer which is available here, and the result is just amazing, good bass although its only for a short distance, because its design is not for a long throw bass,, check it out
 

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