AUDIO OPERATIONS 4-3
to feed a local PA system or DAT recorder, along with a rear-panel stereo headphone
jack. The other monitor mixer has dual stereo headphone outputs to feed producer and
talent simultaneously.
If we sound proud of the design of ZephyrExpress’ mixers, we are. But if you’d prefer to
bypass them entirely, there are also separate direct-codec outputs . You can use these for
high-quality stereo monitoring regardless of the mixer settings.

The Send Mixer

Routing Level
Mic 1 Routing Level
Mic 2 Routing Level
Line
S
end Meters
Routing / Overload
Indicators

Microphone Inputs

Each of the two microphone inputs has the same signal flow:
XLR
+–
Phantom Pwr
on/off
Sensitivity
High Pass
in / out Limiter
in / out
Overload LED
part of Routing indicator
S
Oscillator
on / off Gain
RoutingA / B / A+B / off
+48v
To Channel A
Codec, Monitors, SEND Meter
To Channel B
Codec, Monitors, SEND Meter
BOLD FACE: Front Panel Hardware
NORMAL FACE: Menu-item Software Switches
The XLR inputs are differentially balanced, with pin 2 hot. Input impedance is 1kΩ per
leg, or 2kΩ balanced, to match most professional microphones. The phantom power
supply provides 48vdc at 6 mA per microphone.
?PHANTOM POWER...
provides DC to charge a condenser microphone and power its preamplifier onthe same 2-conductor balanced shielded cable that’s carrying the mic’s audio. Itdoes this by applying the voltage equally to both signal wires, returning thevoltage through the cable’s shield. Since audio is carried differentially in abalanced wiring scheme, the two don’t interfere: there is no DC voltage fromone signal wire to the other.It’s called “Phantom” because a properly-wired dynamic or ribbon microphonewon’t see the voltage at all.