Compatible with most brands of PA/DJ
Subwoofer Speaker Cabinet Suggested Cabinet Cutout:3 inches
Condition:Brand New
Color:Black
Material:Plastic
Outside diameter (including flange):77mm/3 inches
Maximum inner diameter: 58mm/2.28 inches
How to choose the right size of speaker box porting tube?
1. Set the cross-sectional area of the ported tube as S1 and the effective vibration area of the woofer as S2, S1=(0.1-0.4)S2 is the best. According to the formula, the cross-sectional area of a 2-inch port tube is suitable for 3.5, 4, 5 and 6-inch woofers.
2. Port Tube Length LV-(1.463x107R 2)/(FB2VB)-1.463R, where:[V is the length of the port tube, R is equal to the radius of the opening of the port tube, and all units are in inches; FB is the tuning frequency in Hertz; and V is the volume of the sound system in cubic inches.
Note:These port tube dimensions are measured manually and may have some slight errors. Please measure and confirm again after receiving the goods to make sure the opening of the speaker box is the right size. If the opening is too big, you can use some glue to fix it.
Package Includes; 2 x Speaker Port Tubes