RCA Sub-Woofer
Did you try making sure the subwoofer is turned on under the set up menu on the Sony Receiver?
Press Set Up, Press the left or right button above the scroll wheel until you get to SW. It should say SW: ON or SW: OFF. If it says SW: OFF, use the Scroll wheel to scroll right until it says SW: ON. Also, make sure you aren't in 2CH mode, try A.F.D or surround sound.
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