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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Are there established metrics for speaker specifications ? posted by AbeCollins on March 2, 2021 at 15:45:17:
companies use to spec them off measurements made in anechoic chambers. Then FFT was commonly used.
From Bing:
"Gated frequency response measurement. This means the signal picked up by the microphone is gated, so that after a certain time frame, all other received signals are ignored. The problem with gated measurement is that the shorter the gate time interval, the higher the cutoff frequency. This means that to get accurate data down to 20 Hz, you will still need no boundaries for at least 8.5 meters, which is pretty pointless indoors"
If a company doesn't spec how measurements were made then it's a guess, bad measurement, or wishful thinking.
I had the good fortune of a day with a classmate's Father (worked on the LED design) at Bell Labs in NJ where I had the chance to see cutting edge before the term was even used. They were making specialized IC's in a room with a laser and saw it in action (the computer we had in school used nixie tubes). The anechoic chamber they had was the size of a football field and 4 stories in height. They were running speaker specs and other weird experiments. The courts eventually dissolved ma bell.
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