What Q factor is too much?

So bit of background, working away applying some eq to the subs n speakers for a new listening room that has been built by a close friend. It is sounding ok above 190hz as that seems to be the Schroeder frequency for the room. No doubt it will need room treatment but enough on that.

My question relates to 200hz and below, in rew automatically checked is allow narrow band Q below 200hz. Am I right in saying that the lower in the frequency range you are the narrower the Q and the higher you are in the frequencies you desire a wider Q?
 
So to understand it correctly I don't want to allow rew to play with the frequencies below 300 and nothing above 500hz. As I find rew can't deal with the room once the waves get above 400hz unless you apply psychoacoustic filter to the measurement.