Where to place the AVAAs in a room? Method 2
A more technical 2 step process can also be used to identify the best location for the AVAAs.
1 – Identify the disturbing room modes:
Assuming the loudspeakers and listening position have been set, measure the frequency decay time in the listening position.
Note that the most disturbing room modes are the ones with the longest extinction time and not necessarily the peaks and nulls that are the result of inevitable first reflections. You may typically identify 3 to 6 modes.
2 – Identify the highest pressure zones for each problematic room mode:
Play a sine wave at the frequency of each disturbing room mode (for example, 32Hz, 77Hz, 112Hz…)
For each of these frequencies, walk around the walls of the room and note down the highest-pressure areas. You can do this with a sound level meter or listening with a single ear.
As a result you should have a map of your room highlighting the wall areas most contributing to each disturbing room mode. This will clearly show the best location for the AVAAs.