From what I understand it is the -6db corner placement setting and the dynamic bass setting to off. The dynamic bass seems to add a lot of bass, so if more bass is needed I would adjust the speaker placement options in the settings first.
I have mine a few weeks now. They replaced my Adam Audio T5V. A few observations, the T5V had a lot of hiss, The Fives have none. It is a cleaner and better looking setup now with less cables. With the T5V I had to EQ the highs all the time. The Fives sound good enough out of the box with the settings above. I only EQ them when listening to music connected to the usb. I use these EQ
settings in SoundSource.