What makes a speaker too big for a given room?

Learsfool: Thanks. I was hoping that was the answer.

I think monitors are also much easier to integrate into a small to medium size room. You can control the height of the drivers as well which varies with listening position and room size and ear level which is hard to do with most towers as they are fixed in one large cabinet which is heavy and would look silly on stands.

IMO, monitors do the disappearing thing better, have a higher WAF, choose the type of stands you like (style, material, brand, size). In general are better looking and have fewer compromises built into them. Bass below 35Hz no big deal to me. Very little in musical audio.

I would also think that big speakers in a small room take up a lot of acoustic space and interfere in a not quite predictable way with the sound they themselves try to make.
So I would say that this is not a good idea. Now how big is too big?

Stanwal is correct regarding the distance between drivers requiring a farther listening position to get a proper blend of the drivers. Dunlavy speakers (SC-IV and larger models) are a good example. Another consideration is low frequency response and whether the room will allow bass to develop properly.

A very large cabinet can become a problem in itself if the room is too small to distance the speakers far enough from each other. They can have huge reflective surfaces (Dunlavys come to mind again) that can mess with your soundstage and imaging. However, this can be remedied with treatment between the speakers.