No sound out of Quantum

I am using a Kemper Profiler (KPA) with spdif cable out to the spdif in on my quantum and ruing 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 caot 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