Sound levels can be averaged over the whole audible spectrum and reported as an overall sound pressure level in decibels (dB). More commonly, sound levels are reported as decibels, A-weighted. A-weighted sound level measurements are numerically adjusted to reflect the frequency-dependent nature of human hearing at low sound levels. Since humans are less sensitive to sounds at low frequency, A-weighted sound levels will almost always be lower than flat, overall sound pressure levels reported in terms of decibels.