Singsound TEK Professional Digital KTV Amplifier. Is a revolution of the next karaoke generation. Optical or RCA Inputs. Stereo Audio Output: XLR Left & Right. Center Speakers Output: XLR. Main Music Output with Individual Volume Control. Main Microphone Output with Individual Volume Control. Main Effect Output with Individual Volume Control. Optical and XLR Output. Optical Input to L & R Output is enabled. Optical Input to XLR Output is enabled. RCA Input to RCA Channel Output is enabled. Free: 2 x UHF Professional Wireless Microphone with Anti-Howling & Feedback Suppressor.