SM Pro Audio M-Patch 4M: Passive Controller/Switcher with Talkback User Manual
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Studio Outputs
The M-Patch 4M has two sets of Studio outputs (balanced and unbalanced), each of
which will carry the input signals chosen by the front-panel Studio 1 and 2 input se-
lector switches. Use these outputs to route your input signals to headphone systems,
to monitoring systems in the recording room, or to any device at which you want the
talkback signal to appear.
Output selector switches
Each of the four outputs can be individu-
ally muted via their corresponding front-panel
MUTE switches. In addition, the Studio 1 and
Studio 2 output levels can be adjusted using the
Studio 1 and Studio 2 rotary volume controls.
These controls can also be used to balance the
volume of the Studio 1 and 2 signals with the
level of the talkback mic.
When talkback is engaged (MIC ON), all output signals are attenuated by -20dB, how-
ever the talkback mic signal only appears at the Studio 1 and 2 outputs.
TalkBACK MICROPHONE
The M-Patch 4M features a built-in talkback system. An internal
microphone is provided on the front panel, or you can plug your
own microphone into the balanced XLR microphone input on
the rear panel. The INT(ernal) / EXT(ernal) switch on the rear
panel determines which microphone is used for talkback.
Pushing the front-panel MIC ON switch engages talkback. It
can also be engaged via a switch plugged into the rear-panel
Mic Remote input.
Talkback level is controlled by the rotary MIC ON volume control. When talkback is
engaged, the signals appearing at the Control Room 1, Control Room 2, Studio 1,
and Studio 2 outputs are attenuated by -20dB. Note, however, that the talkback mic
signal only appears at the Studio 1 and 2 outputs.
Using the M-Patch 4m
You can use M-Patch 4M anywhere you want to trim the voltage of, i.e., reduce the
volume of analog audio signals. Other than its primary use as a professional moni-
toring controller, you could, for example, use the M-Patch 4M to trim the output
of a microphone preamplifier. With its high-quality potentiometers and precision
film-resistor master attenuator, the M-Patch 4M passes signal more accurately
and with far greater transparency than the built-in volume controls found on most
audio equipment.
You can use the MPatch 4M...
•
To A/B between different audio sources
•
As a switcher for multiple monitor systems
v O L U M E
v O L U M E
M U T E
M U T E
H ea d p h o n e
O U T P U T S E L E C T O R
10
0
v O L U M E
M -P A T C H 4M
10
0
10
0
C / R
C / R
1
2
1
2
St u d io 2
S t u d io 1
C / R 1
C / R 2
S T U D IO
C / R
1
2
S t u d io 1
S t u d io 2
M ic O N
10
10
10
0
0
0
M U T E
M U T E
M ic O N
M ic
BL1 BL2
UB1
UB2
BL1 BL2
UB1
UB2
-
0
B A L AN C E D
A u x
A l l M U T E
S T E R E O
M O N O
v O L U M E
v O L U M E
M U T E
M U T E
H ea d p h o n e
O U T P U T S E L E C T O R
10
0
v O L U M E
M -P A T C H 4M
10
0
10
0
C / R
C / R
1
2
1
2
S t u d io 2
S t u d io 1
C / R 1
C / R 2
S T U D I O
C / R
1
2
S t u d io 1
S t u d io 2
M ic O N
10
10
10
0
0
0
M U T E
M U T E
M ic O N
M ic
BL1 BL2
UB1
UB2
BL1 BL2
UB1
UB2
-
0
B A L AN C E D
A u x
A l l M U T E
S T E R E O
M O N O