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INPUTS:
A.
BALANCED INPUTS
The PSC AlphaMix Audio Mixer provides four input channels utilizing female XLR
connectors. The ultra low noise input circuitry has been developed to set new
standards in low noise field production gear. The XLR connectors are wired as
follows: Pin 1 shield (ground), Pin 2 Audio high (in phase), Pin 3 Audio low (out of
phase).
Balanced wiring enables longer cable runs without the worry of
excessive noise due to nearby electromagnetic and radio frequency interference.
These balanced inputs may be unbalanced if desired. Either pin 2 or 3 may be
tied to ground (pin 1) to unbalance the inputs of the AlphaMix. Note: The AES
standard for unbalancing an XLR connector is to tie pin 3 to ground (pin 1).
B.
INPUT LEVELS
The PSC AlphaMix can accommodate a wide range in input levels. Microphone
levels of all types can be handled as well as line level signals. The input range of
the AlphaMix is –70dBu to +4dBu. Thus the AlphaMix is compatible with all
forms of consumer and professional audio equipment. The input level switches
are located below and to the right of each input XLR connector. These input
level switches provide for two level settings: "M" Microphone (0dB attenuation),
"L" Line (50dB attenuation). In addition to the line/mic switch, each input channel
of the AlphaMix is equipped with a rotary trim pot that allows the user to set
precise pre-amplifier gain. These input gain trims have a range of approximately
40dB. The combination of these two input level controls can be used to correctly
interface sources of varying levels to the AlphaMix's preamplifiers. Correct level
matching ensures maximum headroom and lowest possible noise floor.
C.
MICROPHONE POWERING
The AlphaMix can accommodate the most popular microphones used today.
The microphone powering switches are located directly below the input XLR
connectors.
They can be switched to either: Dynamic (D), Tornader (T) or
48Phantom (48).
In the Dynamic position the mixer provides no microphone powering.
position is used with dynamic microphones, line level inputs and when using
wireless receivers.
In the T Position the mixer provides 12 volts DC to power 12T microphones. This
12T microphone power standard is also known as AB power. 12T microphone
power supplies 12 volts dc across pins 2 and 3. Pin 2 is positive with respect to
pin 3.
Pin 1 is ground.
microphones designed to operate on 12T.
designed for 48PH or 12PH.
In the 48 Phantom Position the mixer provides 48 volts DC to power 48PH
microphones or simplex powered microphones with a range of 9 to 52 volts or 12
12T microphone power should only be used with
Do not use it with microphones
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