ɐ mˌæθɪmˈæɾɪkli sˈɪmplɚ ænd klˈɪɹli dᵻfˈaɪnd ɐpɹˌɑːksɪmˈeɪʃən əvən ˈiːkwəllˈaʊdnəs nˈɔɪz ɪz pˈɪŋk nˈɔɪz wˌɪtʃ kɹiːˈeɪts ɐn ˈiːkwəl ɐmˈaʊnt ʌv ˈɛnɚdʒi pɜːɹ ˈɑːktɪv, nˌɑːt pɜː hˈɜːts ˈaɪ.ˈiː. ɐ lˌɑːɡɚɹˈɪθmɪk ɪnstˈɛd əvə lˈɪnɪɹ bᵻhˈeɪvjɚ, sˌoʊ pˈɪŋk nˈɔɪz ɪz klˈoʊsɚ tuː "ˈiːkwəli lˈaʊd æɾ ˈɔːl fɹˈiːkwənsiz" ðɐn wˈaɪt nˈɔɪz ɪz.
A mathematically simpler and clearly defined approximation of an equal-loudness noise is pink noise which creates an equal amount of energy per octave, not per hertz (i.e. a logarithmic instead of a linear behavior), so pink noise is closer to "equally loud at all frequencies" than white noise is.