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I too have a self powered subwoofer but mine came with bare wires and not a RCA jack. HDMI won't get you where you want to be. There is a pair of terminas on the back of the receiver for the subwoofer and you would need to connect to those. Instead of a RCA to HDMI adapter you should use a bare wire to female RCA speaker output adapter. See https://www.bestbuy.com/site/kicker-k-series-1-1-bare-wire-to-rca-speaker-cable-blue-gold/6336727.p?skuId=6336727. If you connect to the subwoofer output terminal on the reciever you will be able to control it better using the setup menu or phone app.
I would recommend:
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