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Thread Length: 9mm / 0
with low frictional resistance
5 accuracy and fine-tuning function
wear resistance and high strength
86mm x 91mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 4pcs U-Joints Thread Length: 9mm / 0Features: Speaker Port Tube is used to improve the bass response of many types of speakers. There are plenty of types to help you with your vented box design, and carries tubes of every shape and size, including adjustable length ports and flared ports. These port tubes are a reliable, convenient installation, while at the same time providing a finished, "pro" look to your bass reflex speaker building project. Normal tubes suffer from nasty turbulence
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