13 –
Operating Voltage Checkmark
: indicates the internal factory wiring for the operating voltage,
120 VAC or 240 VAC.
14 –
¼” TRS jack Unbalanced Output
: provides maximum output of +22 dBu; 100 k
Ω
load. The
recommended load is > 10 k
Ω
.
15 –
XLR Balanced Output
: provides maximum output of +28 dBu, balanced or +22 dBu, unbal-
anced; 600
Ω
load.
Note
: At any gain setting, the balanced output is 6 dBu higher than the unbalanced output. (0
dBu = 0.7746 V rms)
16 –
DC-coupled Microphone input
: this input has no phantom power applied and is intended for use
with microphones do not need phantom power, such as ribbon, moving-coil, or self-powered condenser
microphones; the low-frequency response is -3dB at < 0.1 Hz; input impedance is > 10 k
Ω
.
17 –
AC coupled Microphone input
: this input provides switchable full-spec P48 phantom power (see
Switch # 1 on Front Panel) for use with phantom-powered condenser or ribbon microphones, etc.; low-
frequency response is -3dB at < 1 Hz; input impedance is > 10 k
Ω
.
Note 1
: Each channel has a DC-coupled and an AC-coupled input. Use only one of these inputs with
each channel at a time.
Note 2
: Connector polarity:
XLR: pin-1 is ground, pin-2 is high, and pin-3 is low
TRS: tip is high, ring is tied to ground, sleeve is ground
Note 3
: No user serviceable or adjustable parts inside. Do not open the case.
Initial Setup
Before connecting the AC Mains power (ref. #12), check that the unit has been wired for the proper
voltage (ref. #13). To ensure electrical safety and correct signal grounding, confirm that the AC source
outlet is properly grounded and never defeat the ground-pin connection on the AC power cord.
Do not place this unit on or in close proximity to any object that emits strong electro-magnetic fields,
such as power transformers, motors, or RF transmitters. While the RP
48
Q is well shielded against exter-
nal fields, it is, after all, a very high-gain amplifier.
Similarly, do not place this unit on any surface that is hot to the touch or where it can become over-
heated.
Before turning on the power, all connections to this unit should be made and the Gain controls (ref. #3
and #4) set at their minimum (fully counterclockwise) settings. Also before powering on this unit, be
sure that the next item in the signal chain is turned down to prevent any sudden loud noises from dam-
aging your system or hearing.
