No sound out of Quantum

I am using a Kemper Profiler (KPA) with spdif cable out to the spdif in on my quantum and running a thunderbolt cable to my MacBook pro.  I have os x sierra as an op system.  Using studio one 3 pro daw.  The guitar is plugged into the front input on the KPA.  The quantum power light is blue.  I see that sound is reaching my mac as the sound levels move when I strum the guitar but I cannot hear anything.  I have set the inputs (for song to spdif and output to headphones.  I am thinking as I write this that i am using xor balanced outputs from KPA to persons scepters but should I use those from the quantum main outputs an then use the dim mute button so I can hear sound from quantum.  I guess I would have to change the outputs to main, is that right?  Any input would be appreciated.  Thanks.

Joe in Mobile