Quote:
Originally Posted by
Gary J
And it seems to be spreading.
Delusion is a funny phenomenon.
But seriously, if we're going to start posting low-rez measurements on cropped and grossly stretched graphs with tons of data missing, then I'd prefer if we went back a decade in time. Back then, I used the RS meter, a test tone CD (which I still have) and a standard 'C' weight RS meter correction file. I plotted each data point on a hand made graph and simply drew a straight line between each data point. The result was exactly like the graph posted above with one exception... Even a decade ago I used 1/12 octave test tones.
For those interested (and most of you know this already, but some may not grasp the significance), when you have single data points, the trace plots a straight line between those points. The lower the resolution (lower # of fractions of an octave), the higher the chance that there is something significant occurring BETWEEN the data points that will simply be ignored by the measurement.
A hi-rez measurement plots a 'curve' that connects infinitely more data points, after which measurement "smoothing" may be applied to the trace, as shown in the 3 graphs I posted earlier. Smoothing has its place in tweaking a system, but it serves as a detriment when tweaking in-room response below 100 Hz.
In the same vein, and this is something I dislike about the GUI of Omnimic, squashing the vertical scale and stretching the horizontal scale of a graph so that the trace is radically out of scale with what we've all been used to seeing from Ed Mullen, AVTalk, Ilkka and REW has the same effect as lowering resolution to most casual observers.
FR, SL, decay and other graphs are extremely useful and have shaped the state of the art far more than any other single advance, but in the end you have to CREATE, then READ the graph accurately.
I dislike the current trend of cheating measurements, downplaying non-linear behavior, fudging data into phake specs, throwing 2M RMS numbers out the window in favor of 1M Peak numbers to grab bragging rights, using modeling software to pretty up a less than optimal trace, claiming theoretical output at 5 Hz when using an amp that gives nothing at 5 Hz, etc.
Elsewhere, I couldn't care less, but here is where we've gone to great lengths to get to the bottom of taming the beast. It would be idiotic to make a u-turn and go Best Buy after all of that effort.
Bosso