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Inputs / Outputs / Controls: Volume control: Bass/Treble Control -4dB to 4dB (allows you to adjust high and low frequency independently) (1) pair of RCA inputs (1) 3.5MM aux input (1) Optical input Front panel UB and SD inputs (1) ¼” Mic input for karaoke (1) pair of RCA outputs make the system expandable Details: Certification: CE and RoHS Compliant Amplifier: Class D, very efficient amplifier with top components! (ADI--ADAU1701, TI--TPA3116, SMPS) System Impedance: Tweeter 6 Ohms ; Woofer 4 Ohms Signal to noise ratio: 91dB (Maximum output with THD+1