Connect the MXQ to the TV with an HDMI cable.
Connect the Sony HTS to the TV with an HDMI cable.
Connect the TV audio output to the Sony HTS. Most likely this will be an optical audio cable.
Check the TV owners manual on how to turn the audio output on and configure it. You may need to turn the TV speaker off in the TV menu too.
OR
Connect the MXQ to one of the Sony HTS HDMI inputs.
Connect the HTS HDMI out to the TV.
If you use the TV tuner or apps you will need to connect the audio output of the TV to the HTS as mentioned above.