Op amp chip: 4 NE5532 Frequency division structure: Linkwitz-Rayleigh filter Signal input: two-channel 2.0 stereo input slope: 12dB/Oct 12dB (2nd oroder) Audio output: 6-channel output (treble left and right channels, midrange bass channels) Capacitor type: Correction capacitor Resistor high-precision metal film resistor Filtering high-pass filtering, low-pass band-pass filtering Power supply: dual transformer 9-12V, be careful not to exceed 12V25W (use preamplifier A small like the one used for module is sufficient, do use large transformer) size: 99mm x 96mm 19mm (length, width height) weight: 73 grams Default crossover: 3288Hz 328Hz bass) Due different batches, there may differences in product appearance, color, printed text, which will affect use. Material: Pcb colour: Black Package Contents: 1 * Speaker Crossover Filter Divider Only above content, other products are included. Note: Light reflection displays cause color of item picture little from real thing. measurement allowed error +/- 1-3cm.