Re: Garage Loudspeaker Lab
To continue, all I was trying to say in the first place, is that if you have a colored noise environment, (A/C units, computer fans, and etc.), it seems to me that the longer sweep length seems to pickup and redistribute more of that broadband noise into the measurement.
This is an anecdotal statement, I have not actually setup and tested this, but it seems to be true from what I've seen. If what we are measuring is LTI you could average multiple FFT's to remove the noise, like is done in traditional spectral analysis.
I have tested a exponential sweep mixed with music many times. Music, which we say can be approximated by pink noise in a global sense, in the interval of the sweep, is never going to have a spectrum close to colored noise.
P.S. I should also say, that I don't do that many live-sound measurements, most everything I work on is under ideal conditions in the lab, so you guys might know more about it than I do. Tools like Sys-Tune which develop a probabilistic model of the system based on any stimulus and enough time, I would think would work very well in a live environment.
