I had the most success using Roon’s DSP EQ. It’s free (if you use Roon) and easy to use. You will also need to acquire software to measure your room to find out where the problem peaks are. The software I used suggested how much to attenuate the peaks and how wide to set the Q. I found it sounded best to use EQ at 300hz and below and to use room treatments and adjusting speaker placement for everything above 300hz. Roon’s EQ (in my system and room) was totally transparent. I’m sure using multiple subs and moving the speakers way into the room would also be a solution but that wasn’t possible for me.