I am lucky enough to work as an engineer for a noise and vibration control company, mostly for aerospace issues. I work mainly in the vibration damping sector, but I have brought home with me a pretty cool little device to measure the acoustics of my listening room. Its a nifty little four channel front end analyzer from Squadriga and a Binaural Headset for Sound Pressure Readings. I can take all the different octave bands, but I assume narrow band is what I want to take my measurements in.
My plan is to do the following:
1. Determine a test album where I play the same 15 seconds of music for each recording - if anyone has a good suggestion, I am all ears.
2. Take my first recording at my primary listening position for 15 seconds.
3. Then move around (in a grid like pattern) taking the same reading with my the sound level transducers from the headset at the same height as my seated position. I will probably make a grid of 6 columns and rows. - Will this be sufficient for mapping out the acoustic modes?
4. After all of the data has been taken, I am planning on analyzing it in a post processor looking at the narrow band frequency data. I will first try to pick out the 1,1 mode of the listening room in both the length and width by looking at frequencies that have large amplitudes in the middle of the room and smaller as they move to the edge along the center axis. Then proceed through the modes trying to determine what frequency has the most issues at my primary listening position and which mode this is associated with so that I can then use a sound absorbing panel where the unwanted frequency is hitting the wall.
So tell me how much has my vibration background screwed up my understanding of what to test? I am basically trying to run a vibration modal analysis but with sound pressure readings, is that going to accomplish anything worthwhile?
Thanks for any help.