Mackie CR1604 Owner's Manual download pdf (Page 19)

CONSTANT LOUDNESS ! ! !

The CR1604-VLZ’s

PAN

controls employ a design

called “Constant Loudness.”

It has nothing to do with

living next to a freeway. As you turn the

PAN

knob from left to right (thereby causing the

sound to move from the left to the center to

the right), the sound will appear to remain at

the same volume (or loudness).

If you have a channel panned hard left (or

right) and reading 0dB, it must dip down about

4dB on the left (or right) when panned center.

To do otherwise, like those Brand X mixers,

would make the sound appear much louder

when panned center.

3-BAND MID-SWEEP EQ

The CR1604-VLZ has a 3-band, mid-sweep

equalization:

LOW

shelving at 80Hz,

MID

sweep

peaking from 100Hz to 8kHz, and

shelving at

12kHz. It’s probably all the EQ you’ll ever need!

(Shelving means that the circuitry boosts or

cuts all frequencies past the specified frequency.

For example, the CR1604-VLZ’s

LOW EQ

boosts

bass frequencies starting at 80Hz and continu-

ing down to the lowest note you never heard.

Peaking means that certain frequencies form a

“hill” around the center frequency.)

The

LOW EQ

provides up to 15dB boost or cut

at 80Hz. The circuit is flat (no boost or cut) at the

center detent position. This frequency represents

the punch in bass drums, bass guitar, fat synth

patches, and some really serious male singers.

20Hz 100Hz 1kHz 10kHz 20kHz

–15

–10

–5

+10

+15

Used in conjunction with the

LOW CUT

switch , you can boost the

LOW EQ

without

injecting a ton of subsonic debris into the mix.

We recommend using the

LOW CUT

feature on

all channels, except low frequency signals, like

kick drums and bass guitars.

The

MID EQ

, or “midrange,” has a fixed

bandwidth of 1.5 octaves. The

MID

knob sets

the amount of boost or cut, up to 15dB, and is

effectively bypassed at then center detent. The

frequency knob sets the center frequency,

sweepable from 100Hz to 8kHz.

come on as a result of clipping. That’s pretty

boring. So, to liven things up, this LED will

glow steadily when that channel’s

MUTE

switch is engaged.

If you need a quick reference to these LEDs,

write this on the back of your hand:

name color flickering glowing

–20 (SOLO) green signal is present channel is soloed

OL (MUTE) red channel is clipping channel is muted

MUTE

Engaging a channel’s

MUTE

switch pro-

vides the same results as turning the fader all

the way down: Any channel assignment to

L-R

1-2

3-4

will be interrupted. All the post

AUX

sends will be silenced, as will the

DIRECT OUT

signals on channels

through

. And of course, that fun-loving

(

MUTE

)

LED will commence to glow. The

PRE AUX

sends , channel

INSERT

send and

SOLO

(in

LEVEL SET (PFL)

mode) will continue to

function during

MUTE

Depending on the audio content in a chan-

nel, engaging its

MUTE

switch may cause a

slight popping sound. This is not a problem

within the mixer, and it can be avoided: Sim-

ply engage the

LOW CUT

switch on each

channel (unless its low frequency content is

vitally important, such as a kick drum or bass

guitar).

LOW CUT

eliminates subsonic de-

bris, which causes the pop, and its effect is

usually transparent.

PAN

adjusts the amount of channel signal

sent to the left versus the right outputs. Pan de-

termines the fate of the

L-R

assignment,

su/jointfilesconvert/319773/bgroups

1–2

and

3–4

, and the

SOLO

(in

LEVEL SET (PFL)

mode). With the

PAN

knob

hard left, the signal will feed the left

MAIN L-R

MIX

, su/jointfilesconvert/319773/bgroup

and left

NORMAL

(AFL)

solo mode (assuming their assignment

switches are engaged). With the knob hard

right, signal feeds the right

MAIN L-R MIX

, sub-

group

, su/jointfilesconvert/319773/bgroup

and right

NORMAL (AFL)

solo mode. With the

PAN

knob set somewhere

in-between left and right, the signal will be di-

vided between the left and right busses.

Stereo Sources

Your life will be easier if you follow this

standard convention: When patching stereo

sound sources to a mixer, always plug the left

signal into an “odd” channel (

, etc.) and

the right signal into the adjacent “even” chan-

nel (

, etc.). Then pan the odd channel

hard left and the even channel hard right.

PAN

AUX

5/6

SHIFT

PRE

TRIM

SOLO

L - R

–

+15

+15-15

800

2k200

+15-15

12k

MID

80Hz

LOW CUT

75 Hz

18dB/OCT

LOW

10 0

+15

MUTE

+10dB -40dB

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 50 51

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Mackie CR1604 Owner's Manual Page 19

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