Need help with understanding room mode data
 

http://www.bobgolds.com/Mode/RoomModes.htm

I'm plugging in various room dimensions and am trying to understand all the terms on this site.

What are the groupings? (iso, near same). What do the colors mean? How do I know what is generally a good room size and what is better or worse?

Could someone please, in simple terms, show me how to interpret this stuff?

Thanks!

I'll take a crack at it.
This program looks for room modes that are close together, which is not desirable.

The most important columns are:
Mode Frequency & Group weighting -

Group weighting tells you if the mode is isolated from others (iso) which is desirable. It Also tells you by color how close adjacent modes are spaced. If it finds room modes closer than 5%, it starts to change color. 0% is red.

What it doesn't tell you explicitly is how strong the modes will be. Generally watch for the axial modes as they are the strongest.

Ideally you will be able to choose room dimensions that spread out all the modes. The room ratio in the default entry fields is a known good one, so everything is green.

Try entering 20' x 20' x 8' to see what happens. You get two coincident axial modes at 56.5 Hz. This will be a problem!

The keyboard shows you where the room modes fall on the musical scale.

The text field contains a wealth of info - I can cover that once you've had a chance to play around and absorb everything above.

Tom

You want a room that has the least amount of modes that will cause frequency response anomalies. If you are designing a room from the ground up, start with room dimensions that are known to work.

https://www.acousticfields.com/ideal...bonello-graph/