Zapco ST-2X 2 Channel Full-Range Class AB 180W Amplifier RCA and speaker- level inputs;Auto-on with speaker level inputs. Channel separation over 60dB;Frequency response 15Hzto30KHz. Variable input gain control;Variable electronic crossover;Variable bass boost control. Compact chassis: 6.3 x 2 x 6.5. Dash Mount remote gain control.