Quick Start Guide

22 23Quick Start Guide500 SERIES MICROPHONE PREAMPLIFIER 502
Controls
(1)
(10)
(11)
(12)
(2)
(6)
(7)
(9)
(4)
(1)
(5)
(8)
(3)
(1)
Mounting holes - The 502 module is
mounted to the host 500 series rack
chassis or box such as the Midas Legend L6
or L10, and secured using two screws top
and bottom.
(2)
Rotary input level meter - This
precision 11-segment peak-reading rotary
input meter has a range from -20 dBu to
+20 dBu in 4 dB steps. The meter reads the
post mic-amp, pre lter signal, to allow
precise setting of the input gain.
(3)
Input gain control - The mic /line input
gain is a precision 12-position rotary
switch with gain settings of 0 (unity gain),
+10, +15, +20, +25, +30, +35, +40,
+45, +50, +55, and +60 dB. The switch
is accurate to within +/– 1 dB at any gain
setting. When set to the “0” position, the
input is capable of receiving input signal
levels of up to +24 dBu, so it can easily
deal with very high level line signals
without the need for a pad. The mic amp is
the same design as used in the Midas Pro
series consoles etc. It has been enhanced
with quad discrete input transistors.
(4)
48V switch - When this switch is selected,
the 502 module supplies +48 Volts
phantom power to the microphone via
the 500 series rack input connector. The
switch’s red LED illuminates to show that
+48V is on. Note: Do not select phantom
power unless you are sure that your
microphone requires it. Microphones
and other audio devices can be damaged
by phantom power. When switching the
+48V on or o, it is recommended that
any connected ampliers are switched
o or muted to avoid DC thumps heard in
the speakers.
(5)
Low pass lter control - This knob
adjusts the low-pass lter frequency in
the range 1 kHz to 40 kHz (-3 dB points).
Starting from 40 kHz, turn the control
anticlockwise gradually to remove any
unwanted HF noise or audio. It can also be
useful to create a more vintage sound.
(6)
Low pass lter IN switch - The IN
switch next to the low pass control
knob inserts the low pass lter into the
signal path, post input-gain and pre
output-trim control. The switch’s yellow
LED illuminates to show that the LP lter
is active.
(7)
Phase reverse Ø switch - When this
switch is selected, the signal phase is
reversed by 180°. The switch’s green LED
illuminates to show that Ø reverse is on.
(8)
High pass lter control - This knob
adjusts the high-pass lter frequency in
the range 10 Hz to 400 Hz (-3 dB points).
Starting at 10 Hz, turn the control
gradually clockwise to remove any
unwanted low frequency content.
(9)
High pass lter IN switch - The IN
switch next to the high-pass control
knob inserts the high pass lter into the
signal path, post input-gain and pre
output-trim control. The switch’s yellow
LED illuminates to show that the HP lter
is active.