Whirlwind EDB1 1-channel Passive Instrument Direct Box Input Impedance: 20k Ohms; Output Impedance: 150 Ohms Frequency Response: 20Hz-20kHz 1dB Level Change: -20dB (input to output, pad switch set to zero dB) Pad: 3 position, provides 0dB, -20dB, -40dB additional attenuation Superb sound quality