from w/w CARPET to WOOD floors

It all depends upon the other surfaces (walls, ceiling, etc.) that you have. If they are reflective, I would keep the wool rug in place....

-RW-

You don't say how your system currently sounds. Are you having a problem, or is this just something you're thinking about? In most cases, people prefer carpet over hard wood floors. Also, berber is probably a bit more reflective than traditional carpet. I feel its somewhere in between.

I've read a fair bit on room acoustics and balance can be one key. So I might agree with RW, what are your other five major surfaces like in terms of absorption/reflection?

But Zd542 asks the most basic question - do you have problems now or are you just restless to change something?

One point I've read from several sources, wool is one of the best absorption materials. It is better than most any synthetic. So your berber with thick pad would seem to be a good choice as part of the desired absorption percentage.