"MD" wrote in message
...
MINe 109 wrote:
[snip] Stephen
Thank you. Actually the newer/more expensive ($400) Behringer has
tones/mic. Why would my hand plotting be bad - in 1hz increments? I use
the radioshack meter. Unless the mic in the TacT is more linear?

The Radio Shack meter is just not adequate for what you want to do. The
reading depends upon the voltage from the battery, which declines the longer
the meter is turned on, recovering when the meter is turned off. Readings
from an RS meter are like blood pressure readings; they vary when, where,
why, and how you take them.

Also, a room is full of materials that have very nonlinear characteristics.
The dissipative characteristics of the walls and furnishings actually vary
depending upon the SPL level. Steady tones excite the room materials,
providing different measured results from sweeps and white noise. There
seems to be a professional belief that measuring with sweeps or white noise
provide measurements that are more relevant for room correction.