Stainless steel TL pipe subwoofer, with JL Audio 13W7
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This is my new Transmission-Line subwoofer tube! Made it my self in 1.5 mm hi polished stainless steel (looks like chrome) fully open pipe that are 2.5meter long(subwoofer in one end and port in the other end) and it plays over 146.5dB @ 50hz!