Symetrix 528 - Input and Output Connections

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2.4 Input/ O utput Connections
CAUTION
When the 528 is used as an input device in any system that includes
power amplifiers and loudspeakers, do not pluA into either the mic or
line inputs while the system's power amplifiers are "on." The 528 can
contribute substantial Aain to input siAnals, and very larAe low
frequency transients may be produced at the 528 ' s output when input
connections are made while the unit is "on." These transient siAnals
will not damaAe the 528 , but when amplified, may damage loudspeakers.
MIC INPUT
A 3- pin XLR connector is provided for microphone level input signals.
Pin 1 • ground Pin 2 • high (+) Pin 3 • low (-)
Input impedance is balanced bridging (to match all low impedance
professional microphones). Maximum input level is -3dBV.
+48VDC phantom power may be applied through pins 2 and 3 of the MIC
INPUT connector by depressing the rear panel PHANTOM POWER switch.
CAUTION
Do not use phantom power before consultinA the microphone
manufacturer's literature. Many condenser microphones have non -
standard power requirements , and may be damaAed by +48 volt phantom
powerinA. In addition, some dynamic microphones may be damaged by
phanto m powerinA. For more information, please refer to Section 1.3
Phanto m Power (on paAe 1).
LINB INPUT
A 1/ 4" 3-conductor TRS (Tip-Ring- S leeve) connector, which is paralleled by
barrie r strip te rm inals . Located on the rear panel , the TRS connector accepts
balanced or unbalanced signals . Use either 2-conductor ( mono type) or 3-
conductor (stereo type) connectors . As shown in the blo ck diagram in Figure
2. 1, the TRS connections are :
Tip • high (+) Ring • low (- ) Sleeve • ground (shield) .
Termi n als 1, 2 and 3 on barrier strip TBl are connected inparallel with the
1/ 4" TRS connector . Balanced or unbalanced line level input signals may
be connected here as well.
11 • high (+) 12 • low (-) 113 • ground
The balanced LINE INPUT impedance is 46.3k ohms . Unbalanced input
impedance is 23.lk ohms . Maximum input level is +18dBV.
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