KRK - RP5 Advise on setting HF knob?

Hi all,

I have just upgraded from M-audio BX5a's to a set of KRK RP5's. I am a little unsure on setting the HF knob for the small-ish room.


At the moment I'm leaving it FLAT at 0db but how do you judge if you need to change it. I mean, if I boost it then I will be compromising the mix

Can you offer any advice on setting this?