What is ideal dimension size for a home listening room?

@arion,  Good comments.  I've been intrigued by the use of non-parallel walls.  Conceptually, it solves a lot of problems if it is properly executed. I'm not aware of any commonly available mathematical models that provides predictions of modes in non-rectangular rooms, which would give me pause in committing to that approach.  

Google says a 20Hz wave is 17m, or 55.8 feet. Wouldn't the ideal room have to have one dimension (diagonal) of at least that length?

@brownsfan,@brownsfan, 

You are welcome. Looking forward to your results with the swarm system. I have been using the Velodyne SMS1 bass eq for years with two subs and it has been fantastic. Note, I stated years, subs and velodyne are over 15 years old. They are classics now:) 

@ DOCKNOW, YES...

@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.