Ok I have a STR-DE925 and it has the DSP sound fields just like all the rest. But I was wondering if I turn down the effect level so its either off or just so the tin can effect disappears does that change the sound field to like the AFD mode or does it just turns the field down? In other words messing with the effect level will it change into another mode like AFD or sound field off? I hope somebody can get through my bad english. Also is it a good Idea to mess with the equalizer on certain modes. This is what I did. I took the high number subtracted the low number and divided by 2. So like on my receiver Treble 10 khz to 1 khz. So 10000 - 1000/2 = 4.5khz I did this for each of the three. Treble/mid/bass. Is this a good thing to do or not?