Features: Double bass special two-crossover crossover: crossover refers to the different frequency bands of the sound signal to distinguish, respectively, to the amplification, and then sent to the corresponding frequency band of the speakers and then playback. Professional speakers high power a low a high crossover, suitable for 12-15inch high power bass use. The use of large material capacitors, ultra-high-power inductors and resistors. Resistors for high-power special aluminum film resistors, better heat dissipation. Make the crossover service life longer. Crossover point in place, high sensitivity treble with electronic automatic protector, bass with large particle capacitance and ultra-high-power inductor protection. This effectively extends the life of the entire auditory Specifications: Item: F125 Speaker Auditory Frequency Divider Size:about 180x140x60MM/7.09x5.51x2.36in For 12inch 15inch Double Bass Crossover for Two-way Crossovers Package Includes: 1PC F125 Speaker Auditory Frequency Divider note: Due to problem of lighting effect and shootings, there will be tolerances in the product, please understand. Please allow 0-1cm error due to manual measurement.