User manual: http://pdf.crse.com/manuals/4168075131.pdf
The SUB WOOFER RCA (see page 11 of the user manual) jack is the audio line out level, you need to feed it to Powered SUB-WOOFER speaker.
Hope it helps.
Register and download the manual for free at retrevo.com
http://www.retrevo.com/support/Sony-STR-DH810-Receivers-manual/id/23635bh634/t/2/
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