ARREL Audio
R-501 ELITE User Manual, Issue 0.2
Page 7
R-501 Elite Front Panel Controls
and Operations
INPUT SOURCE SELECTION
The R-501 Elite
input stage is based on a
differential amplifier so it is “electronically
balanced”.
If the Line-In 1/4" jack is not inserted on the housing
on the front panel the mic input is activated, the
insertion of the Line In jack disconnects the mic
input. Due to its very high dynamic range, the
ARREL Audio R-501 ELITE
does not require any
input pad
switch.
PHANTOM-POWER SWITCH
Press the button to activate the +48 V Phantom
Power (LED on). To deselect the Phantom Power
press again the button (LED off).
A special circuit allows the connection of
microphones even if the unit is turned on with the
Phantom Power activated.
GAIN CONTROL KNOB
Turn the gain knob in order to select the required
amount of gain for either the mic input or the Line
input.
The gain range if the mic input is activated is 70 dB.
If Line input is activated the range is 30 dB.
LO-CUT SWITCH
Push the button to activate the high pass filter (LED
on). The filter cut-off frequency is 80 Hz with 12
dB / Oct. slope. Press again to switch off the filter
(LED on).
PHASE SWITCH
Push the button to invert the phase of the audio
signal by 180 degrees (LED on). Press again to
switch off the phase inversion (LED off).
LEVEL INDICATOR
The output level Indicator is based on a 10-LED
Bargraph (7 x green LEDs and 3 x red LEDs) that
measures in the range +6/-21 dBu, The resolution
in 1.5 dB per step.