Hello,
I have two RME Fireface 800 units. The way you describe it, I think there are two possible explanations: a.) either you haven't chosen the proper routing configuration so that you can get properly audio from the H8000FW to the Fireface or b.) the H8000FW works ok and you haven't routed the signal from the Fireface to your monitors. To do this just use the Matrix Mixer and then check for meter activity (LEDs).
Hope this helps,
Regards,
Yannis
