Rather than taking the time to scan my Holman surround sound book or any number of Dolby papers I have in my office, I found this simple block diagram of typical cinema (and home theatre) bass management. This ought to clear up any confusion as to how bass management routing works.
This is from a vendor that produces a bass management VST plug-in (disclaimer: I have no involvement in this project nor have I used it or will attempt to vouch for its effectiveness) -- I'm simply using the image.
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