Rockford Fosgate 400x4 - Manual (Page 10)

◆ Pass-Thru Output
The Pass-Thru output provides a convenient source for daisy-
chaining an additional amplifier without the need for extra RCA
cables or “Y” adapters. The Pass-Thru signal is derived from
summing the Front and Rear Left inputs to create a Left output, and
summing the Front and Rear Right inputs to create a Right output.
When the amplifier is used with 4-channel inputs, the Pass-Thru
provides constant output regardless of the source unit fade
position. Additionally, the Pass-Thru has an XCard that can be set
for High-Pass, Low-Pass or Full Range.
THE RESULT: Constant non-faded output for adding woofer
amplifiers.
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