It is said that for floorstanding type of...

Who is saying that? I'm assuming what you are trying to convey is that floorstanding speakers won't sound good until you spend over 8000 dollars?

You can't put a price on which speakers stop having deficiences, as all speakers have deficiences. You can get very good sound for 3-4K for floor standing speakers. Even less than that usually..

Bluesky, I disagree 100%. 8000 dollars has nothing to do with the speaker not sounding good. It takes associated equipment, and the room for speakers to sound good, but it won't take 8000 dollars. "Sounding good" is a relative term. You could say that there are no speakers under 50,000 dollars that sound good.