The subwoofer crossover is a dedicated crossover for the loudspeaker box. Its function is to divide the total frequency signal from the power amplifier, block the signals above the mid-low frequency from passing through, and allow the bass, subwoofer, and subwoofer to pass through. It uses a lot of materials. The inductor adopts 1.5 wire diameter large inductor, audio-specific large capacitor, high-power high-frequency porcelain pin resistor, PCB fireproof board thick copper base plate, and two (four gears in total) adjustable switches are added to to flexibly adjust the bass, in order to achieve the most suitable effect, reasonable design, fine workmanship, using solderless terminal blocks, DIY is more convenient, fine workmanship, and the effect is very good. Applicable power: 550W Applicable impedance: 4 - 16ohm Frequency response: 43Hz/45Hz Applicable speakers: 6.5-15 inch (heavy) woofer Due to different batches, the appearance, color and printed words of the product , which not affect the use. Colour: Red Material: PCB Size: 188x118x67(mm) Package Contents: 2 x frequency divider Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.