Symetrix 551E - Chapter 5 Rear Panel Connections

7
551E
552E
/
Rear Panel ConnectionsChapter 5
Input Jacks
The 551E/552E is equipped with an XLR and a
¼" jack. Both will work either balanced or
unbalanced and will generally accommodate
just about any standard +4dBu nominal line
level audio source. If you plan on plugging a
mic directly into the 551E/552E’s XLR input...
don’t bother. It will not hurt anything, but it
just will not work. The input jacks are config-
ured as follows:
XLR
pin 1=ground
pin 2=+/high
pin 3=-/low
¼" Balanced
tip = +/high
ring=-/low
sleeve=ground
See Appendix A for adapter wiring examples.
Figure 8 - View of rear panel connectors.
INPUT
BALANCED/
UNBALANCED
BALANCED/
OUTPUT
BALANCED
3
INPUT
221
3
RING
TIP
SLEEVE
1
OUTPUT
TYPICAL BALANCED CONNECTIONS
UNBALANCED
BALANCED
RING = LOW(-) = PIN 3
SLEEVE = GND = PIN 1
TIP = HIGH(+) = PIN 2
Output Jacks
There are two output jacks wired parallel to
each other - a balanced XLR, and a balanced
¼" TRS. These can drive balanced or unbal-
anced inputs but you should check Appendix
A for wiring examples. The outputs are
configured as follows:
XLR
pin 1 = ground
pin 2 = +/high
pin 3 = -/low
¼" Balanced
tip = +/high
ring = -/low
sleeve = ground