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Message: <blockquote data-quote="detroitdiesel" data-source="post: 7263707" data-attributes="member: 621531"><p>Hello. I have a 2002 GMC sonoma extended cab ZR2 that i just put a stereo in. The sub is a 12 spoke style RE SX 10inch on a audiopipe AP15001d. Anyways, the box it is in is 1.25cuft tuned to 30 hz. The port is facing forward, and the sub is firing upward. What i don't understand is when the doors are shut and the windows are rolled up, it isn't loud at all, but if you roll down a window it gets much louder, and if you open a door its many times louder. Anyways, i was wondering what is causing this, and what would be a better sub box configuration Thanks.</p></blockquote><p></p>

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