If I remember correctly the 606 has 2eq.
Essentially the 606 is saying that it "wants" to allow the front speakers to handle 20-20k. Sure, fine. You have two sound modes for that(direct and pure direct).
But you would rather set the crossover somewhere between 40hz and 80hz. Anything between there is correct (for that pair of speakers you have).
If you find other forums out there with "my AVR sets my speakers large, why?" posts...
That goes back to the genius(sarcasm) decision to call "included in the bass management" as small. And "not included in the bass management" as large.
Onkyo stepped a bit outside that by calling "not included in the bass management" being "full band" which is a more accurate term. Audyssey(not Onkyo, Denon or NAD) is notorious on 2eq models to set the main speakers "weird". Change it up to what you want.