USER'S MANUAL Acoustic AUDIO WS1005 Passive In Wall Sub woofer Amplifier Thank You for your purchase of your new Acoustic Audio Passive In Wall Sub woofer Amplifier! Acoustic Audio amplifier for a passive in wall sub woofer includes LFE and RCA inputs, gain and crossover controls, and raw wire speaker outputs, It delivers crisp, clean power with easy connectivity to a vast array of audio sources for your household audio entertainment.