Features:
1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;
2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.
3.The speaker inverted hole is also called the sound tube and the air hole. It is often used in the inverted speaker. The main purpose is to overwhelm the airflow sound of the speaker vibration in the box. The front overlaps with the sound pressure radiated in front of the speaker to produce a bass effect.
4.It is suitable for 6.5 inch or 8 inch speakers.
5.This structure can significantly enhance the low-frequency radiation intensity, increase the volume, improve speaker efficiency.

Principle: when the anti-phase sound waves radiated from the paper cone into the box, through the action of the box, and then radiated outward through the inverted tube, some of the sound waves of the lower limit frequency can be close to the phase of the same frequency sound waves radiated in front of the paper cone , So the radiation efficiency of the speaker can be improved, thereby extending the low frequency response. Compared with a speaker without an inverter tube, this structure can significantly enhance the low-frequency radiation intensity, increase the volume, and improve the efficiency of the speaker. In layman's terms, it can increase the volume of the bass without increasing the power of the speaker itself.

Specifications:
Material:Plastic
Color:Black
Brand name: Unbranded
Size:16x11cm/6.3x4.33Inch(LxDia)
Weight:450g

Package include:
5 x Speaker Port Reflex Tube