API Audio 1608 Recording Console - Manual (Page 15)

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TO BUS: Routes the output of stereo Send 7 and 8 directly to the Summing Bus 1-4 assignment
section. When TO BUS is engaged the send functions as follows:

Auxiliary Buses 7 and 8 are fed in addition to the Summing Bus 1-4 assignment section
 Auxiliary Sends 7 and 8 cannot access the Program Bus from the channel module
 The 7/8 on/off button is bypassed for the feed to the Summing Busses, but is still active for
the feed to Auxiliary Buses 7 and 8
 The 7/8 PRE button may be used
 The 7/8 stereo level control and pan-pot are active
 The channel output pan-pot is bypassed for Summing Bus assignments from Send 7/8
 Illuminates when engaged
2.5 Routing and Output Section
Direct Output: The Direct Output feeds the channel output signal to the DIRECT OUTPUT on the
rear panel. The Direct Output has the following features:
 The Direct Output is fed post-fader
 The Direct Output is always active except when the channel MUTE is engaged
 Balanced, line-level output at the DIRECT OUTPUT XLR connector
Summing Buses: The channel output may be assigned to one or more of the eight Summing
Buses or Active Combining Amplifiers (ACA). Some possible applications of the Summing Buses
include:
 Multitrack channel assignments
 Multitrack summing
 5.1 mixing
 Additional channel outputs
 Additional echo/auxiliary sends
 Sub-grouping
The summing buses (ACA) include the following features:
 Individual Summing Bus assignments from the 548B modules
 Switchable Odd/Even Summing Bus panning on the 548B modules
 Routing from Echo/Auxiliary Sends 7 and 8 on the 548B modules
 Individual on/off, calibration, trim, solo, and Program Bus assignment controls on the
168B module
 Balanced, line-level outputs at the BUS OUTPUT 1-8 (ACA OUTPUT) sub-D connector
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. The Program Bus includes the following
features:
 Program Bus assignment from the 548B modules
 Program Bus Insert via the 268B module and rear panel connections
 440B Stereo Master Fader
 Individual Left and Right program channel on/off, calibration, and trim controls
 Balanced, line-level outputs via the LEFT and RIGHT PROGRAM OUTPUT XLR connectors
The routing and output section of the 548B Channel module provides a
comprehensive set of routing and output functions including:
 Insert
 High-pass filter
 Switchable panning
 Bus assignments
 Direct Output
The output section provides three simultaneous audio output options:
 Direct Output: Direct balanced line output
 Summing Buses: Any of eight summing buses (ACA)
 Program Bus: The Left and Right stereo Program Bus (PGM)