Does the Trickling Wave & Ocean Surf have embedded subs too?

[rosebudd]

Yeah pretty sure, if i want to hear the whole range on ocean for example i have to set it to a certain volume, when i play ultrasonic at the same volume I get the high pitch of death, the only way to make it go away is to lower it to -40dB but at that level i think it's way too low.

And I enjoy the trickling water sound I was just curious if they work AS WELL as the ultrasonic.