Speaker exposes the speaker diaphragm to produce sound, and there is also vibration at the back of the speaker. After installing the port tubes,as the diameter of the port tubes is smaller than the diameter of the speaker, a relatively strong sound wave will rush out of the inverted tube. the sound waves towards the front and back of the speaker are utilized, Improve the sound quality of the speaker. Speaker port is made of PP plastic, strong and sturdy, can be used for long time. For improved speaker cabinet, portable speaker, home speaker or car speaker. 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.

Specification:
Product name: Speaker cabinet port tubes.
Size: Outer diameter: 121 mm / 4.76".
Opening diameter: 99 mm / 3.89".
Length: 117 mm / 4.6".
Material: PP plastic.

You will receive:
4 pcs subwoofer port.

Notes:
1.Manual measurement, please allow slight errors on size.
2.The color may exist slight difference due to different screen displays