Is it fine to place the sub in the center of the sound stage under the TV. Or place next to ether left or right speakers like i have it now . My sub is a m&k v125
Just try out the different positions you have available and go with whatever sounds best to you. A corner placement or next to a wall will give you more output but can be a little (boomy) in some cases making it easier to localize. Center placement reduces output but in my experience it blends into the sound stage better. Try placing it behind you as well if you dont like what you hear with it up front.