I question the validity of supertweeters. If your speaker is a good one, and flat lines up to at least 20 Khz, then, it seems to me, in the audible range, the supertweeeter is merely doubling the speaker's high frequency output.
These ultra high frequencies tend to go unnoticed when in balance. Emphasizing them will produce an upward balance that seems more airy and alive, but does not correlate with real music IMO.
These ultra high frequencies tend to go unnoticed when in balance. Emphasizing them will produce an upward balance that seems more airy and alive, but does not correlate with real music IMO.