ART Pro Audio TPS II - Tube Preamplifier System - Manual (Page 12)

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REAR INPUT JACKS
The rear XLR and ¼” input jacks are directly wired together. The ¼”
jack being wired TRS balanced (Tip = HOT, Ring = COLD, Sleeve =
GROUND). The rear
panel ¼” jack is intended for low level line inputs. The
input impedance of these jacks varies with the Input Impedance control from 150
to 3000 Ohms.
Use the front panel ¼” input for instruments and unbalanced line level
signals.
If the front ¼” input is in use, the TPS II
 will use the instrument input
and ignore the rear panel inputs.
XLR OUTPUT JACKS (REAR)
The XLR Output jacks of the TPS II
 are active balanced. You may
use them in an unbalanced configuration without harm to the output
circuitry. The XLR outputs can provide a hefty signal level (+28dBu) at
a low impedance, so make sure that you do not overdrive equipment
with sensitive inputs. When using the DPS II™ on the front end of a
mixer, go into the mixer’s line in or insert inputs and not necessarily
into the mixer’s microphone input, unless the mixer can pad that input’s
level.
¼” OUTPUT JACKS (REAR)
The ¼” Output jacks are unbalanced and should be used for sending
signals to amps, processors, or other unbalanced configurations.
Both balanced and unbalanced output connections may be used
simultaneously. This is particularly useful when using the TPS II
 as a
direct box for instruments or line level signals. Make sure that both
pieces of equipment connected to the preamp’s outputs are connected
to the same earth ground, beforehand, to avoid electrical shock.