Linked to this thread is a beta version of a room layout and frequency response estimation spreadsheet. The spreadsheet:
+ Allows entry of room dimensions, listener location and independent placement of right and left speakers
+ Calculates the location of the first reflection points along each of the side walls (for treatment placement purposes)
+ Calculates the speaker boundary interference frequencies
+ Calculates the room modes based on the dimensions of the room
+ Estimates the untreated room frequency response curve at the listener location
+ Estimates the T60 (time for a sound to decay -60db) based on the surfaces in the room (using Sabine's formula)
+ Calculates the Schroeder frequency for the room (room crossover frequency from resonator to reflector)
+ Calculates main speaker listening angles
+ Allows screen size and aspect ratio selection from a dropdown menu and calculates screen viewing angles
+ Calculates Dolby ATMOS ceiling speaker optimal locations given ceiling height (45 degrees from listener ear height)
+ Creates a scaled map of the room with speaker and listener locations marked
This was created to help me do all of these things as I'm designing a new home theater. There are various tools that do some of these things, but I didn't find one (that was free) that did all of them. I have done my best to validate the calculations, but there could be errors. The estimated frequency response curve at the listener is a rough estimate as I had to use linear interpolation for the location on the sinusoidal wave instead of a more precise calculation.
Feel free to use this for your own home theater adventures. Comments are welcome, but please be kind. It may not be perfect, but it meets my needs and might help others as well.
I'm posting this for AVSForum members to use freely because of all of the helpful information and feedback that this forum has provided over the years.
This was originally posted in Audio Theory and Setup but it is more appropriate here as I have added many home theater calculations.
Spreadsheet Web Version Link
| Spreadsheet Download Link
vb02 - Changed room width data entry to be direct, with secondary entry on listener distance from left wall.
vb10 - Added main speaker angle calculations. For home theater, viewing angle calculations along with a dropdown to select home theater screen size has also been added. The data entry was also simplified.
vb11 - Added Dolby ATMOS ceiling speaker location calcs, added scaled model of the room based on object locations
vb12 - Added main speaker sound transmission time to listener and millisecond delay for side and opposite wall first reflection points
vb14 - Added ability to include up to four subwoofers with independent locations to the analysis. Also reorganized the presentation of data to simplify the visuals.
vb15 - Added front wall first reflection locations and further cleaned up the interface.
Modified delivery to be through the web site, this enables access via mobile devices and computers that do not have Excel.