You obviously didn't read carefully. "Rather than produce acoustic energy, as one might expect, Ultra Tweeters actually organize and improve the energy flow in signal conductors, making the audio system perform more efficiently and synergistically."

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8