Pioneer GM-DX871 1-Channel Class D Mono Subwoofer Amplifier *GMDX871
1-Channel Subwoofer Amplifier. The GM-DX871 LPF is adjustable from 40 Hz to 240 Hz. Crossover Network Subwoofer Channel LPF - 40 Hz-240 Hz. Frequency Response – Subwoofer Channel 10 Hz to 240 Hz. Crossover Network Subwoofer Slope -12dB/oct.