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If your Sony has RCA audio inputs then it's not a BD player but an HTS with built in BD player.
The connections above are to get picture to the TV. To get audio from the cable box to the HTS you will need to use an analog audio output either from the cable box or from the TV. You may need a HDMI audio extractor or optical to analog converter depending on the make and model of cable box and TV.
If your Sony has RCA audio inputs then it's not a BD player but an HTS with built in BD player.
The connections above are to get picture to the TV. To get audio from the cable box to the HTS you will need to use an analog audio output either from the cable box or from the TV. You may need a HDMI audio extractor or optical to analog converter depending on the make and model of cable box and TV.