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The DB25b from Rolls is a transformer balanced, passive direct box. It features a ground lift switch for hum elimination, and a rotary attenuator for padding the input signal from -20 or -infinity dB. Padding the input signal provides a way to connect the unit to a line level signal or even a speaker level signal and connecting it to a balanced line level input on a mixer. The two 1/4" inputs are paralleled pass-throughs to also send the input signal to a tuner, pre amp, etc.
Single channel passive direct box
Attenuator knob for connection to line level or speaker level signals
Mounting tabs make it easy to attach to any surface
Controls only on the front and back for "brick wall" multiples