PYLE PLMR20PA Marine Public Address System Controller Balanced Microphone Input Low Level (RCA Type) Inputs for CH1-4 4-Channel Output Variable Low Pass/Fixed High Pass Crossovers on CH1-4 Variable 0-+18db Bass Boost on CH1/2 and CH3/4 Input Sensitivity Selector Variable Input Gain On CH1-4 Can Be Used with 2CH or 4CH Audio Input Source Waterproof, Hardwired Input/Output and Power Cables Dimensions: 8-5/8''W x 6''D x 2-1/8''H Sold as : Unit Balanced Microphone Input - Input Sensitivity Selector Low Level (RCA Type) Inputs for CH1-4 - Variable Input Gain On CH1-4 4-Channel Output - Can Be Used with 2CH or 4CH Audio Input Source Variable Low Pass/Fixed High Pass Crossovers on CH1-4 - Waterproof, Hardwired Input/Output and Power Cables Variable 0-+18db Bass Boost on CH1/2 and CH3/4 - Dimensions: 8-5/8''W x 6''D x 2-1/8''H