2Pcs 75mm x 89mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Box Vent Pan Head Phillips Screws Mounting Hole Distance: 137mm /

Mounting Hole Distance: 137mm / 5

Inner Diameter: 9mm / 0

Rubber Head Size: 18 x 14 x 17mm(Max Dia*Min Dia*Height)

) : 3 m³/min

2Pcs 75mm x 89mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Box Vent Pan Head Phillips Screws Mounting Hole Distance: 137mm /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