There are two ways to route the audio output from NextD Player to your home theater's sound system.
1) Digital audio through the HDMI cable
1.1 Connect the NextD Player to an HDTV or AV receiver directly through an HDMI cable.
1.2 Connect the HDTV or AV receiver to your home theater's sound system through a matching audio output/input port.
1.3 This option is recommended for maximally preserving the digital sound quality.
2) Analog audio through the L/R (white/red) audio ports
2.1 Connect the NextD Player to your sound system directly using an RCA cable's RED (R) and WHITE (L) analog audio lines.
2.2 If you choose this option, make sure to check the system settings on NextD Player by going into Settings->Sound->Audio Output Mode and check both AUDIO_CODEC.
2.3 If you don't plan to output sound via HDMI, you can uncheck AUDIO_HDMI, but we recommend leaving it checked so that your TV receive audio signals as well. You can simply mute the volume on TV so that it doesn't compete with the audio from your sound system.