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1/3 Octave centre frequency (Hz)
40, 50, 63, 80,100,125,
160, 200, 250,
315, 400, 500
630, 800, 1k
1.25 to 4k
10,12.5, 16k
Effect on voice
Sense of power in some outstanding
bass singers.
Voice fundamentals.
Important for voice quality.
Important for voice naturalness. Too
much boost in the 315 to 1k range
produces a telephone like quality.
Vocal fricatives - accentuation of vocals.
Important to speech intelligibility. Too
much boost between 2 and 4kHz can
mask certain speech sounds e.g “m”, “b”
and “v” can become indistinguishable.
Too much boost anywhere between 1 and
4kHz can produce “listening fatigue”.
Vocals can be highlighted by slightly
boosting the vocal at 3kHz and at the
same time slightly dipping the instruments
at the same frequency.
Accentuation of voice.
The range from 1.25 to 8k governs the
clarity of voice.
Too much boost causes sibilance.
1/3 Octave centre frequency (Hz)
31,40, 50, 63
80, 100, 125
160, 200, 250
315, 400, 500
630, 800, 1k
1.25 to 4k
5,6.3, 8k
10, 12.5, 16k
Effect on music
Fundamentals of bass drum, tuba, double
bass and organ. These frequencies give
music a sense of power. If over-
emphasised they make the music “muddy”.
50 or 60Hz band also used to reject ac.
Mains hum.
Fundamentals of lower tympani. Too much
boost produces excessive “boom”. 100 or
125Hz also used for hum rejection.
Drum and lower bass. Too much boost
produces excessive “boom”. Also useful
for 3rd harmonic mains hum rejection.
Fundamentals of string and percussion.
Fundamentals and harmonics of strings,
keyboards and percussion.
Boosting the 600 - 1kHz range can make
instruments sound horn like.
Drums, guitar accentuation of vocals,
strings and brass.
Too much bass in the 1 to 2kHz range can
make instruments sound tinny. Too much
boost anywhere between 1 to 4kHz can
produce “listening fatigue”.
Accentuation of percussion, cymbals and
snare drum.
Reduction at 5kHz makes overall sound
more distant and transparent.
Reduction of tape hiss and system noise.
The 1,25 to 8k governs clarity and
definition.
Cymbals and overall brightness. Too much
boost causes sibilance.
Reduction of tape hiss and system noise.
Table 1: Effects of Equalisation on Voice Reproduction
Table 2: Effects of Equalisation on Music Reproduction
15
5, 6.3, 8k