API Audio 1608 Recording Console - Manual (Page 26)

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3.4 E1608 Connections
The rear panel connections for the E1608 Echo Send/Return module are as follows:
ECHO SENDS EXTERNAL INPUT 1-8:
 Balanced, Line-level
 1/4” tip-ring-sleeve jack
ECHO SENDS OUTPUT 1-8:
 Balanced, Line-level
 Female 25-Pin Sub-D connector
ECHO RETURNS AUX INPUT 1-8:
 Balanced, Line-level
 1/4” tip-ring-sleeve jack
ECHO RETURNS INPUT 1-8:
 Balanced, Line-level
 Female 25-Pin Sub-D connector
ECHO RETURNS 500 SLOTS IN 1-8:
 Balanced, Line-level
 1/4” tip-ring-sleeve switching jack
 The signal from the Reverb Return Input
connector is replaced with this signal when a jack
is inserted
ECHO RETURNS 500 SLOTS OUT 1-8:
 Balanced, Line-level
 1/4” tip-ring-sleeve jack
 Also normalled to feed the Echo Return module
input