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 , 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 . 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 wider.) 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 products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.