Absolutely !
Since 1977 I have used the IIa, IIIa, and now the 3.6 in rooms about the same
size with excellent results. The speaker "couples" best to the rooms
of that size.
Set the speakers about 4 or 5 ft out from the front wall, and sit about 10 or 11
feet away from them. That gives 3 or 4 feet behind the listener to the rear wall.
Place the speakers one third the width of room from left edge of right speaker to
right wall, one third between, and on third from right edge of left speaker to
left wall.
The 3.6 speakers work best in rooms of that size, and worse in smaller or larger
rooms IMO.