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Owner’s Manual

3-BAND EQ

The mono channels have 3-band equalization at

carefully selected points — low shelving at 80 Hz, mid

peaking at a variable frequency from 100 Hz to 8 kHz,

and high shelving at 12 kHz.

“Shelving” means that the circuitry boosts or cuts all

frequenciespastthespeciedfrequency.Forexample,

rotatingthelowEQknobclockwisewillboostthebass

at 80 Hz and below.

“Peaking” means that certain frequencies form a “hill”

aroundthecenterfrequencyinthecaseofthemidEQ.

There is a lot of boost and cut available, be-

cause you may occasionally need it, but if you

maxtheEQsoneverychannel,you’llgetmix

mush. Equalize subtly and use the left sides of the knobs

(cut), as well as the right (boost). You can create many

interestingandusefulEQchangesbyturningtheknobs

down and adjusting the faders [19] up if needed.

13. HIGH EQ

This knob gives the channel signal up to 15 dB of

boost and cut at 12 kHz and above. At the center posi-

tionthehighEQhasnoeffectonthesignal.

Use it to add sizzle to cymbals, and an overall sense

of transparency, or edge to keyboards, vocals, guitar and

bacon frying. Turn it down a little to reduce sibilance, or

to hide tape hiss.

14. MID EQ

This knob gives you up to 15 dB of boost and cut at

a frequency set by the mid freq [15] control. At the

centerpositionthemidEQhasnoeffectonthesignal.

MidrangeEQisoftenthoughtofasthemostdynamic,

becausethefrequenciesthatdeneanyparticular

sound are almost always found in this range.

15. MID FREQ

This knob allows you to set the frequency of the mid

EQcontrol.Itvariesfrom100Hzupto8kHz,witha

frequency of 600 Hz when centered.

16. LOW EQ

This knob gives you up to 15 dB of boost and cut at

80Hzandbelow.AtthecenterpositionthelowEQhas

no effect on the signal.

Frequencies below 80 Hz represent the realm of bass

drums, bass guitar, fat synth patches, and lower down to

some really serious male singers.

17. AUX

These controls allow you to adjust how much of the

channel signal is added to the aux bus. The aux bus

contains the sum of all channels whose aux controls

[17, or 24] are set to more than minimum. For the mono

channels 1 and 2, the aux signals are split and sent to

both left and right aux bus. The aux bus feeds the aux

outputs [5], typically out to an external processor.

• Theauxoutputisaffectedbythegain,EQ,and

aux level of each channel.

• Theauxoutputisnotaffectedbythefaderlevel

control of each channel, and it is independent

of the main mix bus.

For an example of using the aux bus, you could set up

a stage monitor for the guitar player. Connect an ampli-

erorapoweredmonitortotheauxoutputs[5].Setall

aux level controls to minimum, then turn up the guitar

channel’s aux level to suit his tone-deaf hearing. Any

adjustments of the faders [19] or main level [36] will

not affect the stage monitor level, so your guitar player

will be happy.

18. CUE

Normally, what you hear in your headphones is the

main mix. If you press cue, then your headphones are

switched internally to listen to the channel that is cued.

This gives you the chance to listen to a source before

you turn up its fader [19] and add it to the main mix.

The cue switches do not affect the main mix, just the

headphones.

Turn down the phones level [35] before you press

cue, as this will protect your hearing if you have a loud

source playing.

The mixer contains a left and right cue bus, so you

will hear left and right mono in the headphones for

channels 1 and 2, and stereo for channels 3 and 4. If you

have more than one cue button engaged, then you will

hear a mix of all cued channels. The cue light [31] will

also come on as a reminder that you are not listening to

the main mix in the headphones.

19. FADERS

These custom faders allow you to adjust how much of

the channel signal appears on the main mix bus. They

have no effect on the level of signals going onto the aux

bus or the cue bus. (If the faders are all the way down,

the channels can still be cued and heard in the head-

phones, or added to the aux bus.)

After the fader, the mono channels are split and added

to the left and right main mix.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 31 32

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Mackie U.420 Manuale del Proprietario Pagina 15

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