API Audio 1608 Recording Console - Manual (Page 23)

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Echo Returns Input: Accepts the balanced, line-level input from the ECHO RETURNS INPUT 1-8
sub-D connector on the rear panel.
 The Echo Returns connector is the default input for the Echo Return
 Echo Return 500 Slots are normalled between the Echo Returns Input connector and the
input to the Echo Return module
o
The signal from the Echo Return Input connector is fed through the
corresponding Echo Return 500 Slot before being fed to the Echo Return module
input.
o
If engaged, a module mounted in the slot will process the audio before it arrives
at the Echo Return module
o
If a slot is empty, the signal will loop through the slot to feed the corresponding
Echo Return input when a Bypass Card is inserted into the card edge connector
of the corresponding slot. (These cards are supplied by API when the console is
delivered without 500 modules in any 500 slot)
o
The modules in the Echo Return 500 Slots may be used elsewhere by using the
ECHO RETURN 500 SLOT INPUT and OUTPUT patch points on the rear panel
o
Inserting a plug into the ECHO RETURN 500 SLOT INPUT jack will defeat the
signal from the Echo Return Input connector, but the output of the slot is still
sent to the Echo Return module
o
The Echo Return 500 Slot may be bypassed by using the Echo Return Auxiliary
Input
Note: Please refer to section 3.3 Echo Return 500 Slots for further information.
Echo Returns Auxiliary Input: Accepts the balanced, line-level input from the ECHO RETURNS
AUX INPUT 1/4” connector on the rear panel. The Echo Return Aux Input signal will replace the
Echo Return and Echo Send (MIX) signals when the AUX IN button is engaged.
Echo Send Output: Routes the output of the Echo Send section to the input of the Echo Return
section. The Echo Send output will replace the Echo Return signal when the MIX button is
engaged.
The Echo Return section provides two simultaneous audio output options:
 Summing Buses: Any of eight Summing Buses (ACA)
 Program Bus: The Left and Right Program Bus (PGM).
Summing Buses: The channel output may be assigned to one or more of the eight Summing
Buses or Active Combining Amplifiers (ACA).
Program Bus: The channel output can be routed to the Program Bus (also ACA) for stereo
mixing and for the Left and Right channels of a 5.1 mix.