<font color='#000000'>12'x40'
Is this the interior dimensions, and how high are the ceilings? If it is this large, then you'll probably need more juice than the 2400 can dish out. You will also need very efficient speakers to fill a room of this size without needing to buy an amp that is too expensive. Using your 2400 in conjuction with a rotel, adcom, or b&k amp would definitely improve things if your room is large.
Please give us some more details. What are your listening habits, preferences, and expecations?
best,</font>