MB Quart NA540.6 540 RMS Watt 6-Channel Nautic Marine Boat Amplifier+Amp Kit MB QUART NA540.6 540 RMS Watt 6-Channel Nautic Series Marine Boat Amplifier . Circuit Topology: Class A/B. Voltage Gain: 0.2V~6.0V. Signal to Noise: &gt;93dB. Frequency Response: 10Hz-45kHz. Crossover Type: Electronic 12dB Per Octave. Crossover Frequency Range CH1 & CH2. .....Hi Pass 250Hz - 4Khz. .....Low Pass 40Hz-250Hz. Crossover Frequency Range CH3 & CH4. .....Hi Pass 250Hz - 4Khz. ......Low Pass 40Hz-250Hz. Tone Control: Bass EQ 0~9dB@45Hz. Rockville RMWK4 4AWG Guage Waterproof Marine/Boat Amplifier Wire Installation Kit. 25 Translucent, Twisted Pair, High Quality, Tinned-CCA Flexible PVC RCA Cable. 20 4 Gauge High Current, Low Impedance, Clear Flexible Power Cable with 3 Black Poly Woven Mesh to better resist chemicals in the battery compartment. 4 4 Gauge High Current, Low Impedance, Light Blue, Flexible Ground Cable. 25 16 Gauge 100% Tinned-OFC, White, Non-Transparent Resin PVC, Flat Speaker Cable. Rockville MRCA20 RCA Interconnect Cable . 20 Ultra-Flexible PVC Shield. Twisted Pair. Premium Audiophile Marine RCA Interconnect Cable. High Performance Water Proof RCA Plugs. Tinned Copper Strands for Sonic Purity.