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JBL GT4-12 DIY Ported Home Theater Subwoofer | AVForums
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Bandpass enclosure for JBL GT4-12 - Team-BHP
JBL GT4-12 (gt412) 1000W Single 4 ohms 12" Subwoofer
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JBL GT4-12, Testing after fitting :) - YouTube
JBL GT4 12" 1000 WATTS ALOT OF FLEX - YouTube
