Frequency Regions

60 Hz up to 500 Hz —> 60% Power —> 5% Intelligibility
500 Hz up to 1000 Hz —>35% Power —> 35% Intelligibility
1000 Hz up to 8000 Hz —>5% Power —> 60% Intelligibility

 

Equalization in Practise

Range 80 – 120 Hz boost can add DEPTH and FULLNESS
Range 120 – 160 Hz boost can cause a voice to sound BOOMY or CHESTY
Range 160 – 250 Hz boost can make it sound MUDDY or MUFFLED
Range 250 – 300 Hz boost can add WARMTH
Range 300 – 600 Hz cut can make a voice BOXY or HOLLOW
Range 600 – 1000 Hz cut can produce HARDNESS
Range 1000 – 2500 Hz boost can make a voice NASAL or METALLIC
Range 2500 – 3500 Hz a few dB boost helps vocal PRESENCE
Range 3500 – 6000 Hz boost can improve vocal CLARITY and INTENSITY
Range 6000 – 12000 Hz boost can add BREATHINESS or SIBILANCE

 

Vowels’ Formants Chart (Hz)

Formant		heed	head	had	hod	haw’d	who’d
Men	F1	270	530	660	730	570	300
	F2	2290	1840	1720	1090	840	870
	F3	3010	2480	2410	2440	2410	2240
Women	F1	310	610	860	850	590	370
	F2	2790	2330	2050	1220	920	950
	F3	3310	2990	2850	2810	2710	2670