^ 94.2 seems to relate closest to the longest part of the room, 6.9m
According to the good old freq = speed of sound / wavelength formula:
At 21 degrees = 343m/s so
343/6.9 = 49.71Hz
Each harmonic will be multiples of this, so: 99.42 Hz, 149.13Hz, 198.84Hz etc etc
For the 5.4m width, the frequency is a bit higher: 343/5.4 = 63.52Hz, also 127.04, 190.56 etc.
Ceiling height will almost double in freq as it is about half the distance as room width.
So given that you had 94.2 when the 'theoretical ideal' is 99.42 suggests that either:
- the room was warmer than 21 degrees when you measured it
- the measurements were taken a few cm off ideal position
- various objects like your couch are making the room a little bit smaller than the full 6.9m
- some comb filtering is happening between interfering frequencies bouncing around all the walls, floor and ceiling (people often forget the floor and ceiling have the same effect on reflected sounds that walls do)
- any of the above
Note the theortical ideals only account for perfectly parallel walls with no other surfaces or solid objects in the way, a perfect air speed of 343m/s and your speaker and mic sitting perfectly flush to the walls. In the bedroom these criteria are rarely met, so near enough is good enough
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