Behringer DI4800A 4 Channel Active DI-box, Booster and Line Isolator Main features Professional multi-functional 4-channel DI-box for stage and studio use Provides impedance and signal matching for direct connection of instruments to mixers and amplifiers Flat frequency response thanks to renowned Behringer OT-1 transformers Possible gain + 18dB in three steps + 6dB for low level signals preamplifier The Ground Lift switch eliminates common ground loop problems Disable attenuation on the -20dB output Connects Neutrik combo and gold-plated XLR connectors Powered by an external DC power supply (included) with optional battery operation (not included) Specification Entrances 4 x XLR / ¼ ”combo jack, balanced 20 kΩ impedance Maximum input level + 20dBu Switchable channel gain + 6dB, + 12dB, + 18dB Exits 8 x XLR male, transformer symmetrical 600 ohms impedance Maximum output level + 20dBu -20dB output signal attenuation enabled System Frequency response 20 Hz to 20 kHz (± 3 dB) THD + N 0.01% at 1kHz, 0dBu Signal to noise ratio 120dB Ground Lift switch Power supply 12 V DC, 500 mA Physical Working temperature range 5 ° C - 40 ° C Dimensions 483 x 71 x 44 mm Weight 1.4 kg