@docknow 55.8 ft in one dimension buys you the ability to sustain a 20Hz standing wave in one direction. I'm not sure that would be on my top 10 list of goals for a good listening room. Most of us are looking for what can be done with small rooms, that is, rooms that can reasonably be accommodated in a single family residential dwelling. 50-60 feet is about 2 times the length that most of us could reasonably execute.
It is a tall order trying to get great low frequency reproduction outside of a concert hall. Fortunately, there is not an enormous about of musical information at 20 Hz. So we can do pretty well with most music in rooms that most homes can accommodate.
It is a tall order trying to get great low frequency reproduction outside of a concert hall. Fortunately, there is not an enormous about of musical information at 20 Hz. So we can do pretty well with most music in rooms that most homes can accommodate.