correction is needed the most in lover frequencies. at high frequencies it's hard to get correct data, often included mics is very cheap and it's natural that more harm than good will be done, you might not be able to tweak a single thing either. correction up to higher frequencies also requires more dsp power for equal result in lover frequencies, becuase of this anthem prepros as default limits the correction to <5khz.

both arc and audyssey pro is way to limited in tweak ability. a good room correction gives pre-set values based on measurements but let the user do how change settings like where equalization will be done and how much. Adam may want correction for the sub 5hz...100hz and fronts 50hz...3000hz but while Eva may have mains doing all the bass and want correction 40hz...1000hz. since every sub is different its important that the user has full control. sub correction below 20hz is important for me since i will use sealed subs with some 15+inch drivers.