OFv2

[THolt]

It's not recommended to use the speaker test or ultrasonic at all on headphones or earbuds. Only masked, and the test is only for ultrasonic.

This is because it's too easy to mess up the volume seeing that you can't hear it consciously, and having it too high may damage hearing, too low reduces effectiveness.

I use hybrid on earphones but only sometimes.  I keep the volume somewhat low but not low enough to where you can’t hear it. 

I usually play it from my phone speaker at night