86mm x 91mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 4pcs U-Joints Package Content: 5pcs of EACH:

Package Content: 5pcs of EACH: Hex Bolts

wear resistance and high strength

5 accuracy and fine-tuning function

Length: 2M/(6

Knobs Size: 18

86mm x 91mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 4pcs U-Joints Package Content: 5pcs of EACH:Features: 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