"Yes/No": Can't be both, has to be one or the other.

"don't know what it means": Easy: you are talking about "0.5 foot". It may be me, but half a foot is six inches. Who knows, YMMV.

"tenth inches": You're kidding, right? I agree with Sanjay. Which ear are you setting the distance to, as that has a resolution of almost six inches. (I'm a fat head!)

"Don't know what that means". Easy, again. If the 990 (and most every other processor or receiver) doesn't give you resolution below a foot using electronic correction, so stay with me on this, MOVE THE SPEAKER OR THE CHAIR to compensate for the differental.