Kicker SX400.2 SX 2-Channel Amplifier with Digital Sound Processing 04SX400.2 UltraMatch Gain Structure, single-band parametric KickEQ (Variable Gain, Boost, and Q), and crossovers ( Variable High and Low-Pass Filters ) SAMS (Stereo And Mono Simultaneously) Adjustable Phase Control: 0 - 180 Remote Gain Control with 20' cord BLAST Port (Bass Level And Signal Transfer) Provides Remote Bass Level Control and control signal transfer between multiple SX amplifiers