Mackie ONYX 1640I Owner's Manual download pdf (Page 16)

16 Onyx 1640i

31. HIGH MID EQ LEVEL

The high mid EQ provides

up to 15 dB of boost or cut

at2.5kHz,anditisatat

thedetent.MidrangeEQis

often thought of as the most

dynamic because the

frequencies that deﬁne any

particular sound are almost always found within this

range. For example, the female vocal range as well

as the fundamentals and harmonics of many

higher-timbred instruments.

32. LOW-MID EQ FREQUENCY

This knob ranges from 100 Hz to 2 kHz. This

determines the center frequency for the EQ ﬁlter, and

allows you to zero in on the precise narrow band of

frequencies you want to have affected by the low mid EQ

[33].

33. LOW MID EQ LEVEL

The low mid EQ provides up

to 15 dB of boost or cut at 400

Hz,andisatatthedetent.

Frequencies affected typically

include the male vocal range

as well as the fundamentals

and harmonics of many

lower-timbred instruments.

34. LOW EQ

The low EQ provides up to

15 dB of boost or cut below

80Hz.Thecircuitisatat

the center detent position.

This frequency represents the

punch in bass drums, bass

guitar, fat synth patches, and

some really serious male singers who eat raw beef for

breakfast.

35. AUX SENDS 1-6

These controls allow you to set up to six independent

mixes, typically for running stage monitors or external

effects processors.

The controls are off when turned fully down, deliver

unity gain at the center, and can provide up to 15 dB

ofgainturnedfullyup.Chancesarethatyouwillnever

need this extra gain, but it's nice to know that it's there

if you do.

28. EQ IN/OUT

This is a true hardware bypass of the Perkins EQ

circuitry to insure that there is no coloration of the

signal if the EQ is not needed. When this button is out,

the EQ controls have no effect on the signal. You may

use this switch to make an A/B comparison between the

EQ'd signal and the signal without EQ.

We have completely redesigned the EQ circuits

baseduponthedesignsofCalPerkins,an

industry-leader in audio engineering for over

three decades and long-time collaborator. This

"neo-classic" design provides the sweet musicality of the

British EQ sound, while still maintaining 15 dB of boost

and cut with optimum Q and minimum phase shift (in

other words, it gives you plenty of control and is pleasing

to the ear!).

The 4-band equalization has low shelving at 80 Hz, low

mid peaking, sweepable from 100 Hz to 2 kHz, high

mid peaking, sweepable from 400 Hz to 8 kHz, and

high shelving at 12 kHz. "Shelving" means that the

circuitry boosts or cuts all frequencies past the speciﬁed

frequency. For example, rotating the low EQ knob

15 dB to the right boosts bass frequencies starting at

80 Hz and continuing on down to the lowest note you

ever heard. "Peaking" means that the frequencies

around the center frequency are less affected by the EQ

the further away they are.

29. HIGH EQ

The high EQ provides up to

15 dB of boost or cut above

12kHz,anditisalsoat(no

boost or cut) at the detent.

Use it to add sizzle to cymbals,

an overall sense of

transparency, or an edge to

keyboards, vocals, guitar and bacon frying. Turn it down

a little to reduce sibilance or to mask tape hiss.

30. HIGH-MID EQ FREQUENCY

This knob ranges from 400 Hz to 8 kHz. This

determines the center frequency for the EQ ﬁlter, and

allows you to zero in on the precise narrow band of

frequencies you want to have affected by the high mid

EQ [31].

100

10k

20k

–15

–10

–5

+10

+15

100

10k

20k

–15

–10

–5

+10

+15

100

10k

20k

–15

–10

–5

+10

+15

100

10k

20k

–15

–10

–5

+10

+15

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Mackie ONYX 1640I Owner's Manual Page 16

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