Masked Or Ultrasonic?

[Shannon]

We are going to be making both available for purchase at once pretty soon. It's not going to make us as much money doing it that way, but it makes more sense overall. Just give me a little bit to get the changes made, and you can have both. I'm not sure what to charge for both at once yet, but if I change anything, it won't be my much.

Basically, though, they're useful for different specific situations. Ultrasonic is better in general because it's much louder and has a greater range that you can be from the speakers for that reason, and because it is more effective for people with some types of hearing difficulty. Masked subliminals, however, are better if you are having trouble playing ultrasonics on your equipment, and can be very relaxing as well.