Ultrasonic
Addicted to Fun and Learning
«Overall distortion limits based on all the frequencies and levels surveyed resulted in the re- quirement that the second harmonic be less than 3%, the third harmonic be less than 1%, and the higher harmonics be less than 0.3-0.1%».
Ask your dealer if he can deliver something on these criteria...
I am not an optimist, 30 years later.
May I ask over what frequency range you/the paper had in mind with those requirements? Is it the full 12-32 Hz in the abstract? I have only made nearfield measurements of my own relatively modest sub (BK Monolith) down to 30 Hz but here it easily exceeds these requirements. I strongly suspect more modern DSP assisted subs from the likes of PSA, JL Audio, Rythmik etc will exceed these requirements over a considerable frequency range. Importantly for the main thrust of this discussion I'd be pretty confident that whatever they do achieve it will exceed the distortion performance of traditional floorstanding speakers.
Here's distortion data for a nearfield measurement for my BK Monolith (with the numbers in the legend being for the cursor position of 30 Hz):
(I'll make a measurement down to lower frequencies when I get chance, and obviously I do expect the performance to get worse there.)
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