You will need:
A10 Inline cable
Optical Cable, USB Cable.
First, Ensure the MixAmp TR has the most recent firmware installed by downloading the ASTRO Command Center here: http://www.astrogaming.com/customer-service/firmware-and-software/software.html
Connect the MixAmp TR to your PS4. Insert the MixAmp USB power cable to the front USB Port on the PS4 and connect the Optical cable to the optical port located on the rear of the PS4.
Next turn on your PS4 and wait for it to load to the home screen.
Go into the "Settings" tab on your top bar of your PS4 home screen. Go to -->"Settings" -->"Sound and Screen"--> "Audio Output Settings"-->"Primary Output Port"-->"Digital Out(optical)"--> then check Dolby Digital 5.1 ch then hit OK.
Under the "Audio Output Settings" menu select "Output to Headphones" and make sure "Chat Audio" is selected and not "All Audio".
Also under the "Audio Output Settings" menu select "Audio Format (priority)" and make sure "Bitstream(Dolby)" is selected and not "Linear PCM"
Connect your A10 headset to your MixAmp TR by plugging the Inline cable into the headset, and the other end of the cable into the port on the MixAmp with the headset icon. Make sure the volume wheel on your A10 Inline cable is turned up. You are now ready to use your A10 + MixAmp TR on the PS4.