The Advents do have a fair amount of heft in the low bass. Your room will be less than ideal for ANY speaker with true low bass response. You get a double reinforcement at some low frequency point because the width and length of the room are the same, and then you basically quadruple the problem by putting the speakers in the room corners. I cannot imagine a good outcome without some serious equalization plus tube traps and other bass-absorbing furniture and devices.
You're stuck with a tough room, so I'd suggest either a nice headphone system, or smaller monitors that have a pronounced rolloff below 60Hz or so... Especially if you'll be putting them in the corners!!!
You're stuck with a tough room, so I'd suggest either a nice headphone system, or smaller monitors that have a pronounced rolloff below 60Hz or so... Especially if you'll be putting them in the corners!!!