Old_School_Brad
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In that case, additional measurement points might be required.It is routine for class d amp to have unpredictable distortion vs frequency vs power.
How am I reinterpreting the word?This regulation is so poorly written that you need to try to re-interpret words, like "obtainable" to even begin to agree as to what the regulation actually requires.
There’s no ambiguity about its meaning in this context. I believe the way I explained it in the comment you quoted was clear.
The manufacturer can choose to measure at 1 kHz if they wish. If they believe this single measurement is sufficient, they can disclose that rating for 20 Hz - 20 kHz if they wish, and claim compliance with FTC rules. Whether this meets the standard or not is ultimately their responsibility. If they are confident in their product without conducting further tests, and third-party testing or random testing by the FTC later confirms that the performance is obtainable, then all is well.
However, if third-party testing shows it is not obtainable, then they’ll likely face consequences such as a warning, fine, or whatever action the FTC deems appropriate for the situation.