API Audio 1608 Recording Console - Manual (Page 46)

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9.2 E1608 Echo Send/Return Connections
The rear panel connections for the E1608 Echo Send/Return module are as follows:
9.2.1 Echo Sends
9.2.2 Echo Returns
9.2.3 Echo Return 500 Slots
ECHO SENDS EXTERNAL INPUT 1-8:
 Balanced, Line-level
 1/4” tip-ring-sleeve jack
ECHO SENDS OUTPUT 1-8:
 Output of the Echo/Auxiliary Masters
 Balanced, Line-level
 Female 25-Pin Sub-D connector
ECHO RETURNS 500 SLOTS IN 1-8:
 Fed from the Reverb Return Input
connector
 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:
 Output of the 500 Slot Balanced, Line-
level
 1/4” tip-ring-sleeve jack
 Also normalled to feed the Echo Return
module input
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