I just saw your explanation of what you want to use it for.

I wouldn't count on the N810 for that. I wouldn't count on whatever headphones you pick up that claim to go down to 6Hz either though. I can't help but think that, if something like this can be effective, it would need to be done through speakers since the inaudible frequencies can only affect you through your bones (up to half of your hearing is from reverberations through your bones).

Or are headphones supposed to be fine for this stuff?