Behringer ULTRATONE K1800FX 180-Watt 4-Channel PA System / Keyboard Amplifier Ultra-flexible 180-Watt 4-channel PA System / Keyboard Amplifier Powerful 12' BUGERA woofer and custom-made 1' driver for ultimate sound reproduction Revolutionary FBQ Feedback Detection System instantly reveals critical frequencies Full 4-channel stereo operation with separate Volume and FX Send per channel Balanced stereo XLR DI with Ground Lift switch for direct connection to your mixing console