It would be dissipated in the tweeter coil, but as its level is at -110dB or below this is not the issue.
Hopefully it isn't. Amir didn't measure it out to 1.8MHz.
The SMSL most likely won't have anything at high enough level to present a safety hazard to the tweeters, but something that's defective, damaged, or poorly designed enough just might. My point is that it's better for an audio amplifier to be band limited to something resembling the range of human hearing rather than attempting to cross over into the ham radio market in for the sake of putting bigger numbers on your spec sheet.