- can you elaborate on this?Yes ... it's good to see the follow through!
The ' Bolt Area ' is a reference to the work by R. H. Bolt - 1939 where a plot / graph is used to access spatial modeling as applied to room acoustics by dimension.
Room dimension ( L x W x H ) ratios for more evenly distributed room modes.
" Rooms whose ratios fall within the shaded area will exhibit a favorably uniform distribution of modal frequencies i.e. : the bottom end will be less lumpy… ".
Reference here:https://studiowizard.wordpress.com/2014/03/31/studio-acoustics-explained-this-is-what-you-need-to-kn...(scroll to The Bolt Area)
Also the amcoustics Room Mode Calculator:
https://amcoustics.com/tools/amroc?l=18&w=14&h=9&ft=true&r60=0.6
Input the room dimensions and hover pointer over The Bolt Area field.
Another Calculator - Some explanation of how the ratios relate to different frequencies.
YT video / John Brandt - Calculator / Spread Sheet:
https://www.youtube.com/watch?v=E38o_GS81yY
And the above should be taken to mean that adjusting the listening position ( as relates to given room example ) would be a breeze.