Specifications

5
INPUTS:
A. BALANCED INPUTS
The PSC Mjr Audio Mixer provides two input channels utilizing female XLR
connectors. The professional 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 Mjr Mixer. Note: The AES
standard for unbalancing an XLR connector is to tie pin 3 to ground (pin 1).
B. INPUT LEVELS
The PSC Mjr 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 Mjr Mixer is –60dBu to +4dBu. Thus the Mjr 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), 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 Mjr 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 shielded 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.