421m
5
Rear panel view (left)
SERIAL NUMBER
AC INPUT connector
OUTPUT connectors
RÉFÉREZ TOUTE RÉPARATION À UN TECHNICIEN QUALIFIÉ.
FABRIQUÉ AUX E.-U. PAR SYMETRIX INC., LYNNWOOD, WASHINGTON.
LYNNWOOD, WA, USA
MANUFACTURED IN
GND
EART
GND
SIG
BALANCED/UNBALANCED LINE OUTPUT
CONNECT TO
SYMETRIX 421 ONLY!
(NOT A MIDI CONNECTOR)
STEREO LINK
POWER
MAXIMUM
AC INPUT
20 WATTS
421m
AGC-LEVELER
STEREO LINK connector
AC INPUT - This connector accepts nominal AC power sources of 115 volts or 230 volts [see
Appendix A (Specifications) for voltage tolerance ranges]. See chapter 4 (Installation) for details
on the detachable (IEC) power cable.
SERIAL NUMBER - Write this down in a safe place (how about the front of this user’s guide?).
STEREO LINK - This 5-pin DIN female connector is used to link two 421m's for stereo operation.
Refer to the STEREO INTERCONNECT section on page 6 for additional information.
OUTPUT CONNECTORS - These are electronically balanced, line level, low impedance outputs.
XLR pin 1 is ground, pin 2 is high, and pin 3 is low. The 1/4" connector tip is high, ring is low, and
sleeve is ground. The screw terminal output is wired in parallel to the ø" and XLR connectors.
Rear panel view (right)
LINE INPUT - These connectors are electronically balanced, line level, bridging inputs. The 1/4"
connector tip is high, ring is low, and sleeve is ground. The screw terminal input is wired in parallel
to the 1/4" connector.
MICROPHONE INPUT - This connector is a balanced, low impedance input. The female XLR pin 2
is high, pin 3 is low, and pin 1 is ground.
MIC LEVEL TRIM - Adjusts the gain of the microphone preamp from a minimum of 25dB to a
maximum of 50dB.
PHANTOM POWER - Applies or removes microphone phantom power at the MICROPHONE
INPUT connector.
TYPICAL
CONNECTIONS
POWER
==
PIN3
XLR
RING
PHONE
LOW(-)
SIGNAL
==
XLR
PIN2
PHONE
TIP
SIGNAL
HIGH(+)
GROUND
SIGNAL
=
SLEEVE
PHONE
=
PIN1
XLR
GND
EARTH
GND
SIG
LEVEL
TRIMTRIM
BALANCED/UNBALANCED LINE INPUT
OFF
+48V
PHANTOM
BALANCED MICROPHONE INPUT
LEVEL
+50+250-10
LINE INPUT
connectors
MIC LEVEL TRIM
LINE INPUT
LEVEL TRIM
PHANTOM POWER button
MIC INPUT connector
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