Hifimannen, in order for the supertweet to contribute (musical) supersonic sound this content (sound) must be on the storage medium in the first place. It rarely is, as Eldartford notes.
Further, no cdp plays over 20k. What is there is often spurious hi frequency noise (unless you throw a sine at it).
Even further, if yr amp specifies 20kHz then its amplitude response will be much reduced beyond that --limiting the usefulness of a supertweet.
To make things worse, our ears' sensitivity typically goes down as the frequencies go up over 3kHz (i.e. to our ears, a louder signal at say 10kHz will sound as loud as a soft signal at 3kHz).
Ultimately, a supertweet usually functions as a "supratweet", intensifying (i.e.playing in conjunction with the nromal tweet) ordinary audio frequency signals over 13kHz or so -- thereby creating the effect of "spaceousness".
Further, no cdp plays over 20k. What is there is often spurious hi frequency noise (unless you throw a sine at it).
Even further, if yr amp specifies 20kHz then its amplitude response will be much reduced beyond that --limiting the usefulness of a supertweet.
To make things worse, our ears' sensitivity typically goes down as the frequencies go up over 3kHz (i.e. to our ears, a louder signal at say 10kHz will sound as loud as a soft signal at 3kHz).
Ultimately, a supertweet usually functions as a "supratweet", intensifying (i.e.playing in conjunction with the nromal tweet) ordinary audio frequency signals over 13kHz or so -- thereby creating the effect of "spaceousness".