Originally Posted by johnnyc
Hmm, I thought the corners were best for bass trapping. With the sides more for mid-high absorption to improve imaging and clarity. Perhaps I am mistaken.
The way I understand it, you want to create a reflection free zone. That means no reflection of any kind (LF, HF, or Mid Band). A rug may absorb some mids, but I am guessing that it will also reflect some HF, depending on thickness, material, construction that was used. Not exactly what you want to achieve.
I am not a professional, but a rug would not be my first choice for the 1st reflection points. But I would try them in the further back of the room. Ultimately, taking before and after measurements may be the only way answer your question for sure.