Speaker Port Tube is used to improve the bass response of many types of speakers. Audio enthusiasts building custom speaker boxes, these bass reflex port tubes will take your sound quality to the next level! Measuring 100mm mounting diameter with 160mm total length, these tubes are designed to improve bass response while reducing the unwanted turbulence and noise that plagues standard ports There are plenty of types to help you with your vented box design, and Parts Express carries tubes of every shape and size, including adjustable length ports and flared ports. Punch Subwoofer With Box Uxcell 2Pcs 100mm X 160mm Speaker Speaker Port Tube Speaker Box Port Tube Uxcell 100mm X 160mm DIY Speaker Cabinet Port Standard mount holes make this tube easier to install than others on the market. These uxcell port tubes will take your bass response to the next level! This 2-pack gives you everything you need for proper bass reflex design Normal tubes suffer from nasty turbulence at the entrance and exit of the port, producing unwanted noise and poor sound quality. 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.