Receivers that include a “Sub Out” feature—the most common hookup method with
Dolby® Digital receivers.
NOTE: Use either the L or R Line input (another hookup option is to use a Y-split cable
and connect both L and R Line inputs). After you make this Sub Out connection, turn
the "Low Pass" filter fully clockwise.
1. Try connecting your AVR (SUBWOOFER PRE OUT 1) to your sub using either the left or the right input on the sub.
2. If that works, you're set.
3. If that doesn't work, get a Y-splitter (single RCA female to dual RCA male - something like this) and connect to both inputs.