Apple Soundtrack Pro 3 - Manual (Page 274)

When the audio signal passes through an EQ filter, the frequencies that pass through can
be raised or lowered in volume. Raising and lowering frequencies using EQ is often referred
to as boosting and cutting frequencies. You can create many changes to the sound of
your project by boosting and cutting various frequencies.
Channel EQ plug-in
Frequency Ranges Used with EQ
Sounds can be categorized into one of three basic frequency ranges: bass, midrange, or
high (also called treble). These can be further divided to include low bass, low and high
midrange, and low and high highs. The following table describes some of the sounds
affected by each range:
Description Frequency range Name
Includes cymbal sounds and highest harmonics
of instruments. Boosting frequencies in this range
slightly can add sparkle and presence. 8–20 kHz High High
This range corresponds roughly to the treble tone
control on a stereo. Boosting frequencies in this
range can add brightness and shine. 5–8 kHz High
Includes the higher harmonics of voices and
musical instruments. This range is important for
adding presence. Excessive boosting in this range
can sound shrill or harsh. 2.5–5 kHz Low High
Includes the consonants of voices and the high
harmonics of musical instruments, especially brass
instruments. Excessive boosting in this range can
create a pinched, nasal sound. 1.2–2.5 kHz High Midrange
Includes the vowels of voices and the harmonics
of musical instruments that create tone color. 750 Hz–1.2 kHz Midrange
274 Chapter 10 Working with Audio Effects