Audiobahn ALD30X, 2 Channel High Performance Line Driver, Maximum Output Voltage 8 Volts, THD: 0.005%, output level control, high level input, RCA inputs and outputs, L / R channel separately adjustable, frequency response 20Hz - 30kHz, S / N Ratio> 100dB, digital voltmeter (blue), dimensions: (LxWxH): 7 3/4 x 4 3/8 x 2 3/4inch