After 3 years, I still don't have a clear answer re Speakers and Frequency

[Shannon]

1) if i found a speaker that has 190 Hz-20 kHz = is this good for ULTRASONIC? can the "Hz" on the left side be anything so long as it is 20kHz on the right side?

1) The ultrasonic track is centered at 17.5kHz if I remember correctly, and then add some to the sides. So the needed frequency range is something like 16 kHz to 18 kHz. Or 15-20 to be sure.

3) i bought soundfreaq last year for AM6, and i did the SOUND TEST and it passed with flying color, but i talked to SoundFreaq and they confirmed that the model i bought is NOT 20kHz . . . can i still use this speaker even though it aint 20kHz (meaning can i use it for BOTH ULTRASONIC and MASKED?

Get the Frequencee app for your smartphone, or borrow someone else's phone, and play some tracks. You'll see how the speaker test works and you'll see where the ultrasonic audio lies.

Since the original questions have been answered as well as I could do, I'll specify here instead.

You need a minimum of 20 kHz on the high end to minimize distortion in the subliminal audio. Clipping the frequency will reduce the clarity of the subliminal and reduce it's effectiveness by making it harder for the subconscious to decode and understand.

My subs, especially 5G, push the limits by achieving optimization levels that are peak. That way you don't have to try to make them better by doing fancy tricks. But this does mean that adjusting them in any way is likely going to degrade their results. If a speaker cannot handle 20 kHz at the top end, you're losing information, and that's not good. If you don't have speakers that can handle the required top end, just use the masked format. Any speakers will handle that.