Re: Do we "need" those >20kHz ultrasonic frequencies for high-fidelity audio?
Reply #35 –
number of loudspeaker used and effects measured.
Funny you should mention the number of loudspeaker(s) (but not the fact that the Oohashi team uses own-designed tweeters without documenting their distortion characteristics). In fact, adding more speakers is one of the measures the Ashihara team routinely employed (even before the Oohashi 2000 publication) in order to isolate the IM effects. Ashihara et al. conclude that they cannot find any effects once they do a proper setup. This you would have known had you read the slightest bit more than what you had as of April 10th when you were ignorant about the mere existence of these studies.
And if you had updated yourself over the last fifteen years - rather than just knocking those who have! - you would have noticed that even the Oohashi team now claims the "hypersonic effect" to be at most zero up to past 30 kHz.