Active DI-box that provides impedance and signal matching, ultra-low noise op amps and end of hum and impedance problems. DI-box provides -20/40 dB pad, ultra-flat frequency response due to servo-balanced operation, and switchable input attenuation in 3 ranges that allows input levels of up to +50 dB, while a ground lift switch eliminates typical ground loop problems. Device is equipped with ultra-rugged aluminium chassis with stackable oversized rubber corners, TRS and gold-plated XLR connectors. DI-box operates on 9 V battery (not included) or with 15-52 V phantom power.