Details
uxcell 4Pcs 82mm x 111mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box Port Tube Vent

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 at the entrance and exit of the port, producing unwanted noise and poor sound quality.This port tubes can overcome the situations and you can experience good looks, low distortion, and superior overall sound quality.
Standard mount holes make this tube easier to install than others on the market.
Please check the mountingn size clearly before buying the item.