KRK KRK10s User Manual page 11

Subwoofer Hook Up with Passive Monitors
If you are using passive (non-powered) monitors that require an external amplifier,
connect the two outputs of the subwoofer to the inputs of the stereo monitor amplifier.
Typically this would also be a XLR connector, but if need be, you can use the other
connections providing the amplifier will accept them at the amp input. Connect the power
amplifier to the speakers as you normally would. Do not attempt to hook the speaker
output of the monitor amplifier to the input of the subwoofer. By doing so, you run the risk
of damaging the equipment.
Mixing Console with TRS
or XLR Monitor Outputs
Amplifier
From Console
Master Outputs
Figure 2
8