5
INPUTS:
A. BALANCED
INPUTS
The PSC M4mkII Audio Mixer provides four input channels utilizing female XLR
connectors. The studio grade input circuitry is transformer balanced for improved
RF rejection and in-field practicality. 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 M4mkII Mixer. Note: The AES
standard for unbalancing an XLR connector is to tie pin 3 to ground (pin 1).
B. INPUT
LEVELS
The PSC M4mkII Mixer 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 M4mkII Mixer is –60dBu to +4dBu. Thus the M4mkII 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 three level settings: “D”
Dynamic Microphone (0dB attenuation), “C” Condenser Microphone (15dB
attenuation), and “L” Line Level (50dB attenuation) These input level attenuation
settings are used to correctly interface sources of varying levels to the M4mkII’s
preamplifiers. Correct level matching ensures maximum headroom and lowest
possible noise floor.
C. MICROPHONE
POWERING
The M4mkII Mixer 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) or 48Phantom (48).
In the Dynamic position the mixer provides no microphone powering. This
position is used with Dynamic Microphones, Line Level inputs and when using
Wireless Receivers.
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
to 52 volts. Pin 1 is shield to ground while pins 2 and 3 carry 48 volts DC. The
term “phantom” is derived from the fact that there is no voltage potential
developed across a dynamic microphone transducer that would interfere with its
operation. However, most portable wireless receivers will not operate with 48PH
turned on. We strongly recommend setting inputs to dynamic for use with all
wireless systems.
It should also be noted that the PSC M4mkII Mixer contains special electronics
that automatically shut off the 48PH DC to DC converter if none of the four