Hello ASR.
Some of you might have stumbled across the maximum SPL @ (1/3/10%) THD (total harmonic distortion) graphs that for example Neumann provides for its products, or those performed by the German audio magazine conglomeration Production Partner, Sound & Recording, Fidelity Online. Basically, they're all done by Dr. Anselm Goertz; he seems to be the only one worldwide performing these measurements, at least in a public manner.
I've also started performing this type of measurement a couple of years ago, inspired by him. This TBM (tone burst measurement) is definitely not the be all end all in terms of correlation to subjective reproduction quality perception, but I still think a 10% limit measurement provides a decently realistic curve for the practical maximum SPL of a subwoofer, and a 3% limit, or 1% for the highest demands, for that of a mid-high speaker. Also, this type of measurement just produces an uncomplicated curve for comparison purposes, which is the second main reason why I like it.
Some documentation on my process: Performing large signal (maximum SPL) measurements like the pros - my case study
And general technical background: STEPS Tutorial
But this thread really isn't intended as a tutorial, explanation, or anything along those lines. I plainly just want to show what such a measurement run looks and sounds like, because I don't believe anyone else has ever done so, and I'm sure there's people curious about it. So here goes:
Max. SPL @ 3% THD measurement of a PA fullrange speaker (DB Technologies IG2TR):
Max. SPL @ 10% THD measurement of a PA DIY subwoofer (THAM 15):
Regards
Stoneeh
Some of you might have stumbled across the maximum SPL @ (1/3/10%) THD (total harmonic distortion) graphs that for example Neumann provides for its products, or those performed by the German audio magazine conglomeration Production Partner, Sound & Recording, Fidelity Online. Basically, they're all done by Dr. Anselm Goertz; he seems to be the only one worldwide performing these measurements, at least in a public manner.
I've also started performing this type of measurement a couple of years ago, inspired by him. This TBM (tone burst measurement) is definitely not the be all end all in terms of correlation to subjective reproduction quality perception, but I still think a 10% limit measurement provides a decently realistic curve for the practical maximum SPL of a subwoofer, and a 3% limit, or 1% for the highest demands, for that of a mid-high speaker. Also, this type of measurement just produces an uncomplicated curve for comparison purposes, which is the second main reason why I like it.
Some documentation on my process: Performing large signal (maximum SPL) measurements like the pros - my case study
And general technical background: STEPS Tutorial
But this thread really isn't intended as a tutorial, explanation, or anything along those lines. I plainly just want to show what such a measurement run looks and sounds like, because I don't believe anyone else has ever done so, and I'm sure there's people curious about it. So here goes:
Max. SPL @ 3% THD measurement of a PA fullrange speaker (DB Technologies IG2TR):
Max. SPL @ 10% THD measurement of a PA DIY subwoofer (THAM 15):
Regards
Stoneeh
