How loud is loud?
When you have a client who is planning offices in the flight path of an airbase, you might imagine that there are concerns about sound isolation. After all, military jets aren’t usually conducive to conference calls.
Ryan Knox and Andrew Mitchell set up the demonstration for our client. The measurements and recordings of aircraft flyovers we took onsite were played back through a speaker and aimed at an office window. A subjective listening test was then performed with about 10 listeners who marked various levels of predicted transmission loss as acceptable or unacceptable for typical business. Many hours of calculation and prep went into the development of a few 10 second wav files to get everything just right. (And a last minute run to find a louder loudspeaker. The venerable KF850 answered the call and was able to produce adequate levels at the window assembly).
As hoped, there was good correlation in the listeners answers.

