R a d i o S y s t e m s , I n c . M A - 4 M a n u a lP a g e 5SpecificationsDistortion THD + N .002% 20Hz to 20kHzFrequency Response ± .1dB 20Hz to 2kHzInput Impedance 20k ohmsOutput Impedance 60 ohmsInput gain jumper selectable 0 to +20dBOutput level +25dBm into 600 ohm loadHeadroom 21dB above +4dBm output(with 600 ohm load)Dynamic Range 123dBCrosstalk > 105dB full bandwidthNoise 102dB below +4dBm