Am am trying to find a pair of 901s. I found a set of series III recently refoamed. And I've also found a pair of series IV, and have no clue if they've been refoamed. Also found what maybe series V or VI, and am wondering do even the more current series V and VI have foam problems if they're from the late 80s, early 90s? Thanks for the info. Also is trying to use these in a smaller room stupid?