Soundstream RUB4.600 100 x 4 4-Channel Amplifier (Midnight Blue) Midnight Blue Finish w/ Brushed Accents MOSFET Pulse Width Modulated Power Supply Three-Way Protection Circuitry (thermal short impedance) Tri-Mode Capable Variable Crossovers(HPF/Full/LPF/Band) Variable Bass Boost High Level Input Direct Wire 4 ga. Power 8 ga. Speaker Terminals