4 Channel (4 IN / 4 OUT) Line-Output Converter. Ideal Interface For Adding an Aftermarket Amplifier. Single Dial, Precision Matched, Stereo & Level Gain Adjustment. Up to 40 Volts RMS High-Level Input Sensitivity. Up to 9.5 Volts RMS Low-level RCA Output. Wide Range DC Offset Circuit and REM Turn-On Options. Selectable 20Ω / 60Ω / 20KΩ Load Input Impedance. Dimensions: 6.68” x 3.9” x 0.94” / 169.6 x 99.2 x 24 mm. Remote Bass Knob Included.