The Krell HTS 7.1 is a 1/3 octave EQ,By no means it's intended to correct 100% room acoustic abnormalities,But to help the system/room intergration.Most room's have a suck-out at about 200hz,The EQ built into the Krell HTS 7.1 is great to handle this problem.
The EQ setup is very simple,just time consuming.
Once you learn to effectively apply the EQ to your specific Room/Speaker application you will find the performance of your system to be greatly enhanced.