[Request] How accurate is this?(i.redd.it)

To clarify, Decibels are a unit of proportion, a ratio between two quantities.

dBA is the measure of pressure level. dBV is a measure of voltage, and dBm is milliwatts.

You're completely right otherwise though

To get even more specific, dBA is A-weighted sound pressure level, which is the measure if sound pressure corrected to the spectrum of human hearing.