4PCS 4.02"x3.19" Subwoofer Port Tubes Speaker Port Tubes Black Bass Reflex Tube with 2-Inch Installation Diameter

Specification: Material: PP Color: black Weight: 140g Feature: Size: height about 102mm (4.02") outside diameter about 81mm (3.19") bottom diameter about 54mm (2.13") 1.Speaker inverted hole, also known as the sound tube and air holes, commonly used in inverted speakers, mainly the box speaker vibration of the airflow sound pressure back out in front of the front with the speaker before the radiation of the sound pressure overlap, resulting in bass effect. 2.Comparison to speaker without inverted tube, this structure can significantly enhance the intensity of the radiation of low-frequency, increase the volume, improve the efficiency of the speaker, in layman's terms, you can increase the volume of the bass, without increasing the power of the speaker itself.

• Made from ABS plastic material for sustainable use
• Size: Height approx. 102mm (4.02") Outside diameter approx. 81mm (3.19") Bottom diameter approx. 54mm (2.13")
• Say goodbye to unwanted noise and poor sound quality - our port tubes are designed to reduce turbulence and deliver superior sound.
• Widely used: perfect replacement parts for improved speaker cabinets, portable speakers, home speakers, etc.
• With standard mount holes, installation is a breeze - no need to worry about complicated setups.