Features: _x000D_ 1. The frequency dividing board consists of the Linkwitz-Riley filter _x000D_ 2. The Linkwitz-Riley is mainly used in active filter circuits, such as many sophisticated multi-channel electronic sound systems _x000D_ 3. This filter is characterized by up to a fourth-order attenuation slope _x000D_ 4. Linkwitz-Riley filter has a very flat phase response _x000D_ 5. Adopt NE5532 Op AMP chip, it has stable performance _x000D_ _x000D_ Specification: _x000D_ Condition: 100% Brand new _x000D_ Filter Type: Linkwitz-Riley Filter _x000D_ Frequency Point: 310HZ/3.1KHZ (20HZ-310HZ for bass output, 310-3.1KHZ for midrange output, 3100-20KHZ for treble output) _x000D_ Attenuation Slope: -24dB/Oct _x000D_ Board Structure: 6-Channel output, treble, bass, midrange _x000D_ Op AMP Chip: NE5532 _x000D_ Size: Approx. 173 x 79mm / 6.8 x 3.1in _x000D_ AC Transformer Power Supply Range: Double 14 to double 19V _x000D_ Connector: Audio input / crossover output -2 gold-plated lotus socket x4 _x000D_ _x000D_ Package List: _x000D_ 1 x Amplifier Board _x000D_ _x000D_ _x000D_ Note:_x000D_ New-style and old-style are shipped randomly