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SPECIFICATIONS
Input Impedance: 600 Ohms balanced
50
K Ohms unbalanced (1/4”)
Output Impedance: 5
0 Ohms TRS Balanced
Max Input Level: -15 dBV XLR 600 Ohms
+18 dBV 1/4”
Max Gain: +65 dB
Max Output Level: +22 dB
Frequency Response 20Hz - 25kHz +/-3dB
THD + Noise <0.1% typical
Noise Floor - 75 dB
Equalizer Boost/Cut: +/- 15 dB
Equalizer settings:
Low shelf: 150 Hz
High shelf: 10 kHz
Mid freqencies: 300 Hz - 5 kHz, Q = 1
Compressor settings:
Threshold: -30 dB to +20 dB
Ratio: 2:1 to 8:1
Indicators Phantom Power LED, Clip LED, Power LED
Analog VU Meter
Input/Output jacks XLR balanced
1/4” unbalanced
1/4” TRS unbal. Side Chain
Dimensions 1.75” x 6” x 19”
(90mm X 162mm X 482mm)
Weight 3.5 lbs. (1.75 Kg)
Power 120VAC (230VAC) 15VA
25
DESCRIPTION
FRONT PANEL
Mic Preamp Controls
PAD: Sets the level of the XLR input only. When in, the mic preamp has +30 dB
of gain, when out the preamp is padded to 0 dB of gain.
PHASE REVERSE: When pressed in, the output signal will be 180 degrees out
of phase with the input signal.
PHANTOM POWER: When pressed in, and the LED above this switch is lit, +48
volts of phantom power is applied to the XLR Mic input.
GAIN: Controls the amount of gain in the tube mic preamp circuit. This control
adds from 0 dB to +30 dB of gain.
CLIP: LED for indicating clipping or possible distortion in the mic preamp circuits.
Compressor controls
IN/OUT: Switch for engaging the compressor circuits. The compressor is active
when the switch is in.
THRESHOLD: Sets the point that the input signal must reach for compression to
begin.
RATIO: This control sets the signal to compression ratio. This ratio relates to the
amount of increase of input compared to output signal. Thus, at a 1:1 ratio, a 1
dB increase of input signal will result in a 1 dB increase of output signal. At 2:1, a
2 dB increase of input signal will result in only 1 dB increase of output signal. At
8:1, an 8 dB increase of input signal will result in a 1dB increase of output signal.
GAIN REDUCTION: VU Meter indicating the amount of compression in dB.
NOTE: THIS METER DOES NOT INDICATE INPUT OR OUTPUT LEVEL.
Equalizer controls
LOW LEVEL: Adjusts level of low frequencies, from 20Hz to 150Hz.
MID LEVEL: Adjusts the level of mid frequencies, as selected by the MID FRE-
QUENCY control. This sweepable filter has a Q or width of 1.
MID FREQUENCY: Selects the frequency to be boost/cut by the MID LEVEL
control.
HIGH LEVEL: Adjusts the level of high frequencies, from 10kHz to 20kHz.
OUTPUT LEVEL: Adjusts the overall volume from the RP503 main outputs.
PWR LED: Indicates power is applied to the RP503.