Manual-
RANE CORP. MADE IN U.S.A.
DIGITAL OUTPUTS
OUTPUTS
GAIN
ACN 001 345 482
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
100-240 V
50/60 Hz 7 WATTS
ML 1
MIC
LINE MIC
LINE
2
AES3
COAXIAL
OPTICAL
OUTPUT SIG / OL
INPUT 2 SIGNAL
INPUT 1 SIGNAL
S/PDIF
1
2
2
1
2
1
1
-
+
-
+
-
+
-
+
INPUTS
2
2
1
1
-
+
-
+
-
+
-
+
PHANTOM POWER
THIS DEVICE COMPLIES
WITH PART 15 OF THE
FCC RULES FOR A CLASS
'B' COMPUTING DEVICE.
Phantom Power
When the Phantom Power button is selected, two things hap-
pen. First, a red LED illuminates so that there is little doubt that
phantom power is on. Second phantom power is turned on only
for inputs that have the mic/line switch in the “MIC” position.
Microphones can be plugged into the XLR connectors or the
euroblock connectors and both connectors have phantom power
available. Microphones receive a full 48 volts of Phantom Power
from the ML 1.
Mic/Line Switch
Phantom Power is only available on an Input when the Mic/Line
switch is in the MIC position
and
Phantom Power is turned on
— the input impedance for that channel is 2.6 kΩ. When the
Mic/Line switch is in the LINE position, phantom power is
disabled, the gain for the channel is reduced by 32 dB and the
input impedance for that channel is 96 kΩ.
Gain Settings
The GAIN controls set the gain through the ML 1 for each
channel. The approximate gain when the Mic/Line switch is in
the either setting is shown in the figure above.
A security cover is included to cover just the GAIN controls
for those installations needing a little protection.
Input LEDs
There is a green input LED for each channel on both the front
and on the back of the ML 1. These light up when an input
signal is at a high enough level to trigger the LED. For the math
inclined, the amount of signal required to light the LED is equal
to the negative of the ML 1 Gain minus 6 dBu.
The formula is: Threshold dBu = – (Gain dB) – 6 dB.
So if the ML 1 Gain is set to 20 dB, the input LED thresh-
old is -26 dBu measured at the input jacks.
Another example: if the ML 1 Gain is set to -10 dB then the
input LED threshold is +4 dBu measured at the input jacks.
The bottom line is if there is an input signal present and the
gain of the ML 1 is set high enough, the green input LED of the
ML 1 should be on.
Output LEDs
There is a bi-color green/red output LED for each channel on
both the front and back of the ML 1. These LEDs light up green
when there is a digital output signal present. They will be green
most of the time as the digital output should always be active.
The LEDs light up red instantaneously if the output waveform
clips. Since clipping is brief, the red together with green appears
yellow. So when a output LED starts to turn color it is time to
back down on the Gain for that channel to prevent signal distor-
tion.
Power LED
This LED lights up yellow when the IEC320-C5 power jack is
properly receiving 100 to 240 volts from any power source in
the whole wide world. That should be just about everywhere you
would want an ML 1.
MIC
MIC GAIN
LINE GAIN
+35
+40
+30
+43
+21
+47
+20
+64
+18
LINE
+3
+8
-2
+11
-9
+15
-12
+32
-14
