Filter direct injection box passive di box with noise filter passive direct injection box with noise filter to reduce rf interference pad switch attenuator and ground lift option professional solution for connecting musical instruments directly to a mixing console unbalanced high impedance input via 6 3mm jack with link output for monitoring xlr balanced lo z output switchable attenuation 0d b 20d b 40d b and ground lift function attenuation 0d b 20d b 40d b frequency re