1. Circuit: The treble, midrange and bass are all designed with a second-order standard 12db/oct circuit. 2. High-tone band current-limiting over-current protection bubble: When the current is small, the bubble acts as a wire; when the current is too large, it acts as a load, consumes the current, and the high-pitched sound is not burned by the current too much. It belongs to a movable type protection. 3. The inductor is wound with oxygen-free copper wire, the bass coil uses 1.2MM wire diameter, the mid-range upper coil uses 1.1MM wire diameter, the middle lower limit coil uses 1.0MM wire diameter, and the high-pitched coil uses 1.0MM wire diameter; The copper wire is full of power, making the bass more powerful. 4. The capacitor uses a non-inductive MKP capacitor with a high withstand voltage of 400V, which better prevents the voltage from crossing and burning the speaker. The design is reasonable, the appearance is exquisite, and the sound quality is excellent. Specification: Rated power:400W Max Power: 800W impedance: 8Ohm design( Applicable to 4-8 ohm speakers.When using 4 ohm speakers, the crossover point is more .) Filter Features: 12 dB / oct Frequency points: 1250HZ/5000HZ (The bass frequency works 1250HZ, the midrange frequency works at 1250HZ-5000HZ, and the treble frequency works above 5000HZ) Net weight: 650g/pc Colour: red black Material: plastic Size: 16.3 x 12.1cm Package Contents: 1 x Car audio crossover Only the above package content, other 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.