American DJ Mix 44 - Manual (Page 3)

CONTROLS AND CONNECTIONS
1. Channel Volume Pots control input signals feeding the
master volume over a range of 60dBm attenuation at full off to
13dBm of gain at full on.
2. Master Volume Pots determine the amount of signal from
the summing amps that is fed to the output drivers and the
headphone monitor circuit. These have a gain range of -60 to
-rl3dBm.
3. Clip LEDs on each of the four master outputs indicate sig­
nal overload conditions within the circuitry. The red clip lights
illuminate at 3dB below actual clipping (the unit clips at -t-28dB
balanced so the LEDs come on at +25dB).
4. Mix Monitor Select Switches apply the output of each of
the four mixers to the VU meter and the headphone circuit.
Outputs may be monitored individually or in any combination.
5. LED VU Meter displays the exact level present at the out­
put XLR connectors measured in dBm. Meter readings will be
higher with multiple monitor select switches activated.
8. Input Female XLR Connectors are actively balanced, dif­
ferential amplifiers providing over 75dB of common mode
rejection. The input impedance is factory set at IMeg ohms,
which eliminates loading of the source signal. Pin 2 is positive,
pin 3 negative and pin 1 is connected to audio ground.
9. Loop thru Male XLR Connectors serve two purposes,
depending on the position of the input select switch. The first
function is as actively balanced differential inputs, providing
over 75dB of common mode rejection, for mixers 3 and 4. The
other purpose is to act as loop thru connectors for signals
applied to the corresponding female input. Input impedance is
also IMeg ohms, with pin 2 positive, pin 3 negative and pin 1
connected to audio ground. Female to female XLR adaptors
can be used to correct gender when used as inputs.
10. Input Select Switches determine the source of input sig­
nal for mixers 3 and 4. In the loop thru "in" position the male
XLRs are parallelled to the female inputs above them. With the
switch "out" mixer 3 and 4 inputs are accessed through the
male XLR connectors.
6. Headphone Circuit monitors the signals going to the Mix
44 outputs. Any combination of mixer outputs can be moni­
tored simultaneously. It is a mono circuit which drives both
earpieces in stereo headphones that have an impedance
greater than 20 ohms . The volume control has a gain range of
-60 to +13dB to accommodate a wide range of audio levels. The
jack is a standard 1/4" TRS type.
11. Output XLRs on the Mix 44 are actively balanced with pin
2 being positive, pin 3 being negative and pin 1 being audio
ground. For unbalanced operation use pins 1 and 2 leaving pin
3 UNCONNECTED.
12. Ground Lift Switch connects the audio circuit ground to
AC ground and the chassis of the unit, if desired.
7. Power Switch connects AC to the transfornmer primary
and the LED indicates that the unit is working. Both sides of
the AC line are switched and a mains fuse is located on the cir­
cuit board inside the unit.
13. Power Cord has a standard 15 amp plug for 120Vac and
has no plug on the Mix 44X 230Vac model. Black is line, white
is neutral and green is earth.