Here are the results of all the rooms:
The red line is a 3m cube room - you might think it's the worst, but actually it gives the best result! Even better than a typical room of 5 x 7 x 2.7m, shown in black.
The rooms simulated are:
1. 3 x 3 x 3m with speakers 0.6m clear of walls and the listening position centred on the back wall.
2. 4 x 4 x 4m with the speakers 1m clear, listening in the same spot
3. 5 x 5 x 5m as above
4. As above but with the listening chair 1m into the room
5. 6 x 6 x 6 with the listening chair 1m in from the rear wall and speakers 1m clear of walls.
All of these results are good except the standard room! It has a large wide dip that is not easily fixed. It is far too big to EQ and acoustic room treatement will most likely do little to solve it. This room will make a beastly sub sound wimpy compared to it's potential. It will be lacking punch.
The 5m cube looks good until we start moving away from the rear wall. We start to see a dip in the upper bass range. Generally it is better to sit away from walls for imaging, so this arrangement suggests multi subs.
Cube rooms are not necessarily bad for bass. Bass in a room is more complicated than that. This is just a snapshot. Things will look different in a real.
There are a few different factors here:
- size of the room (very small and very large rooms are very different to most)
- where you sit makes a big difference
- where you place bass sources changes everything
- room construction varies