The 'traditional' notion of a single "head unit" with integrated controls, pre-amp and power amp doesn't exactly apply ..... in the FE there are separate modules for control of the system via the dash knobs, touch-screen and steering wheel switches. I don't think it is correct to consider those pre-amp and power-amp stages in the traditional sense.
The single "Audio Unit" I mention is the source of the amplified signal to the speakers in the non-Sony 9-speaker FE system on SE trim level with the SE Convenience Package. Ford doesn't seem to publish the audio signal level, if any, out of any of the 'control modules' I mentioned. Those are likely communicating CanBus-type control data to the "Audio Unit" rather than pre-amped audio signals. IMHO the "Audio Unit" is an integrated pre-amp + power-amp meaning there is no place for you to grab a low-level pre-amped signal in this system .... your subwoofer amp needs to be able to handle 'speaker level' inputs.
'14 Escape SE 2.0 FWD (25 Sep 13 build); 201A SE Convenience Package; Power Liftgate; Leather Comfort Package; Oxford White on Med Light Stone Leather (SYNC 2 w/8" MFT screen)
I love my hard-working '05 F-150 XLT 5.4 V8 trailer-towing truck, too !
Help us help you - what is your year, engine, drivetrain, trim and SYNC version?
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