This Palmer PAN 03 19" Active Four-Channel DI Box has a jack input with a parallel output on each channel for passing the signal through. A -30 dB attenuation switch allows connection to either a line or loudspeaker signal. This active 4 x DI box has a 19" format, and the technical specifications identical to those of the PAN-02. All connections and switches are located on the front panel, and an additional parallel XLR output is located in the back. The box is built in 19" rack-mount format, with one rack-space of 3.5" (90mm) front to back.