Sony STR-DE897 receiver going into protector mode very often

[fletcherhub3]

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.

 

[kanewolf]

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.

 

[fletcherhub3]

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.

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