Sony STR-DE897 receiver going into protector mode very often

Dec 27, 2018
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How can I fix my Sony STR-DE897 receiver from going into "protector" mode so much? I'm new to the whole audio setup idea with a receiver, subs, and monitors, but I'm running my MSI Z170i motherboard into the receiver via optical cable, out to 2 KEF C200 SW subwoofers, and out of those stem 2 Yamaha NS-10M monitors. I got these given to me but am confused because my music will not go very loud before the receiver goes into protector mode. Any help is greatly appreciated.
 
Solution
Those KEF subs are 4 ohms. Which, based on writing I see of pictures of that unit is below the minimum impedance for that unit. You can't run those subs with that amp.
Dec 27, 2018
2
0
10

Thank you very much! I will see if the receiver will go into protector mode without the subs.