RP503
TUBE CHANNEL
• Tube Mic Preamp
• Optical Compressor
• Equalizer
ROLLS CORPORATION
SALT LAKE CITY, UTAH
7/01
OWNERS MANUAL
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SPECIFICATIONS
DESCRIPTION
FRONT PANEL
Input Impedance:
600 Ohms balanced
50K Ohms unbalanced (1/4”)
50 Ohms TRS Balanced
-15 dBV XLR 600 Ohms
+18 dBV 1/4”
+65 dB
+22 dB
20Hz - 25kHz +/-3dB
<0.1% typical
- 75 dB
Output Impedance:
Max Input Level:
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.
Max Gain:
Max Output Level:
Frequency Response
THD + Noise
Noise Floor
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.
Equalizer Boost/Cut:
Equalizer settings:
Low shelf:
+/- 15 dB
150 Hz
High shelf:
Mid freqencies:
10 kHz
300 Hz - 5 kHz, Q = 1
Compressor controls
IN/OUT: Switch for engaging the compressor circuits. The compressor is active
when the switch is in.
Compressor settings:
Threshold:
THRESHOLD: Sets the point that the input signal must reach for compression to
begin.
-30 dB to +20 dB
2:1 to 8:1
Ratio:
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.
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
Equalizer controls
Dimensions
Weight
1.75” x 6” x 19”
(90mm X 162mm X 482mm)
3.5 lbs. (1.75 Kg)
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.
Power
120VAC (230VAC) 15VA
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.
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DESCRIPTION CONT.
OPERATION
When the RP503 has been properly connected, ensure the power switch is on
and the Power LED is lit.
MIC PREAMP SETTINGS
REAR PANEL
For condenser microphones, press in the Phantom Power switch. Press the PAD
switch in if you’re sending a line level (+4dB) signal into the RP503. This helps
prevent overload. Send a signal to the RP503 by checking the microphone or
instrument connected to the INPUT. Adjust the GAIN control while sending the
signal, when the CLIP led lights slightly, back the GAIN control off (counterclock-
wise) one or two marks to achieve the proper level of incoming signal.
120 VAC 50/60 Hz:
OUTPUT: 1/4” unbalanced and XLR balanced output. Connect to an audio re-
corder line input or mixer line input. Note: Do not connect the RP503 XLR Output
to a mixer’s Mic Input - it will overload that input.
SIDE CHAIN: 1/4” Tip-Ring-Sleeve Send\Return jack. Connect an Insert cable to
this jack and to a signal processor or other device to alter the action of the RP503
compressor.
COMPRESSOR SETTINGS
INPUT: Balanced XLR and unbalanced 1/4” Input jacks. Connect balanced micro-
phones to the XLR input, and unbalanced instruments to the 1/4” input.
Press in the IN/OUT switch to engage the compressor. Begin by setting the
THRESHOLD control high (around 3 o’clock) and the RATIO low (fully counter-
clockwise). This is a very low compression setting. To increase the amount of
compression, lower the THRESHOLD and increase the RATIO until the desired
amount is achieved.
CONNECTION
Make sure the RP503 power cord is properly connected to a grounded AC outlet.
Shown below are examples of how to connect the RP503 for use with a micro-
phone or instrument. Do not use both inputs at
the same time.
USING THE SIDE CHAIN
To use the SIDE CHAIN to directly access the compressor circuitry, you’ll need
an Insert cable like the one shown above. The Tip-Ring-Sleeve stereo end plugs
into the RP503 SIDE CHAIN jack. The 1/4” SEND plug connects to the Input
of a signal processor such as an equalizer, the 1/4” RETURN plug connects to
the signal processor Output. The signal in the SIDE CHAIN is not heard on the
Output of the RP503, it only effects the action of the compressor. The higher the
level of signal in the SIDE CHAIN, the more compression will occur.
EQUALIZER SETTINGS
Begin with all controls set at 0 or center detente position. This is the equivalent of
a “bypass”. Adjusting the LEVEL controls will increase or decrease the amount
of the indicated frequency range. The MID FREQUENCY control adjusts the
actual frequency that the MID LEVEL control will adjust.
USING THE PROCESSES TOGETHER
Increasing the Mic Preamp GAIN settings to the point where slight distortion
occurs will effect the overall frequency content of the output signal. EQ adjuste-
ments may need to be made.
Experiment with different settings until you’ve acheived the desired sound.
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