Features:1. The frequency dividing board consists of the Linkwitz-Riley filter2. The Linkwitz-Riley is mainly used in active filter circuits, such as many sophisticated multi-channel electronic sound systems3. This filter is characterized by up to a fourth-order attenuation slope4. Linkwitz-Riley filter has a very flat phase response5. Adopt NE5532 Op AMP chip, it has stable performanceSpecification:Condition: 100% Brand newFilter Type: Linkwitz-Riley FilterFrequency Point: 310HZ/3.1KHZ (20HZ-310HZ for bass output, 310-3.1KHZ for midrange output, 3100-20KHZ for treble output)Attenuation Slope: -24dB/OctBoard Structure: 6-Channel output, treble, bass, midrangeOp AMP Chip: NE5532Size: Approx. 173 x 79mm / 6.8 x 3.1in AC Transformer Power Supply Range: Double 14 to double 19VConnector: Audio input / crossover output -2 gold-plated lotus socket x4Package List:1 x Amplifier BoardNote:New-style and old-style are shipped randomly.