I can see the utility of a manufacturer using spectral analysis for QC but for an artist, not so much.
I don't think the companies do that though. They make cymbals, the "ears" person at the company
listens to them, and decides if they fall within an acceptable range of the intended sound. The eventual customer does the same thing with
their ears, hopefully without being overly influenced by size, type, weight, or brand. A cymbal either sounds good to the ear, or it doesn't. Assigning a set of technical values to it shouldn't suddenly make it better or worse.
Look, I understand that specs can lead to the categorization of certain aspects of an instrument, and that may be a desirable tool for some. But there's more to liking a sound than just being sure the specs line up a certain way.
Let's say you like the concept of using a DrumDial or other such tuning device, to be sure every head matches a pre-determined reading, and so is technically 'correct'. Would you sit down at a kit and start playing, without first making sure it actually sounds good? That's a real leap of faith, IMO. The reality is, after fiddling with key rods and readouts, the drummer has to hit the drum, and finesse it to the sound his
ear likes, regardless that the numbers said the drum was already 'tuned'. And I'm not disparaging tuning aids, they're great for getting in the ballpark. But in the end, the
ear decides whether the drum sounds its best, and further adjustments are almost always necessary.
Anyway, I am fascinated about how my cymbals might 'look' on a graph, it's not something that had ever occurred to me to explore. Another interesting thing I've been exposed to here at Drummerworld!
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