Formuler Z-Nano STB

I've now connected my Z-Nano STB to my TV and my Surround Sound System all is working well but have I missed a audio setting as when my Surround Sound is set to PLII I don't seem to be getting the sound from all five speakers
Or is the STB limited to just stereo audio output?

I had a Mag254 previously and when playing music or watching films all five of my speakers sent out the sound.
 
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