Ultrasonic volume - the definitive answer

[RTBoss]

Have a few questions regarding the sub listening setup.

1. I'm using FrequenSee to measure the dB. The scale is 0 to -100dB. If I understand correctly the lower the number the louder it is? So -30dB would be louder than say -50dB?

2. This has probably been asked elsewhere in the forum but can't seem to find it. I listen to US while sleeping on my side. Will it still be as effective? I can't sleep on my back or face down.

Any response will be appreciated.

Yes to both questions.