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Operating Manual -1662A Mic/Line Mixer
clipping, detecting excessive signal level on any
critical audio path within the master section. If
all outputs are turned down and there is still
clipping, then one or more inputs needs to be
turned down.
4.8 Phantom Power LED4.8 Phantom Power LED
4.8 Phantom Power LED4.8 Phantom Power LED
4.8 Phantom Power LED
The phantom power switch is on the back
panel. When the switch is pressed in, the LED is
lit and +48VDC is applied to all six mic inputs for
use with condenser microphones. If there is a
mix of both condenser and dynamic
microphones, the phantom power will not affect
the operation of the most dynamic mics. The
phantom power voltage ramps up gradually to
minimize any turn-on "pops".
5. CONNECTORS AND CABLES5. CONNECTORS AND CABLES
5. CONNECTORS AND CABLES5. CONNECTORS AND CABLES
5. CONNECTORS AND CABLES
The 1662A mixer is fitted with three types
of audio connectors: 3-pin Euroblock assemblies
are used for mic/line inputs and main outputs, 1/
4" tip-ring-sleeve (TRS) phone jacks are used for
individual channel insert points, and RCA jacks
are used for sum inputs.
Two-conductor (twisted pair) shielded
cable is best for all audio connections that use
Euroblock assemblies. Belden No. 8412 or its
equivalent is an excellent cable due to its heavy
Power
construction. This type of cable should be used
for all portable applications. Snake cables
containing multiple shielded pairs can be used
for a permanent installation, but must be
handled very carefully because the leads tend to
be fragile, and a broken conductor is difficult to
repair.
If low level and high level lines are run
parallel for long distances, crosstalk may occur.
In fact, the crosstalk (signal leakage between
cables) can cause an electronic feedback loop,
oscillation, and possibly damage to the
equipment. To minimize crosstalk, physically
separate low level (microphone) cables from
speaker cables by the greatest feasible distance.
At any point where cables meet, run low level
cables perpendicular to high level or speaker
cables. If low and high level or speaker cables
must be run parallel and in close proximity to
one another, they should be bundled separately.
In a permanent installation, avoid running
speaker cables and mic cable through the same
conduit pipe.