Mackie 1642VLZ4 Owner's Manual download pdf (Page 9)

Owner’s Manual

1. Mic Ins

ThisisafemaleXLRconnectorthatacceptsa

balancedmicorlinelevelinputfromalmostanytype

ofsource.TheseOnyxmicpreampsfeaturehigher

delityandheadroomrivalinganystandalonemic

preamponthemarkettoday.These circuits are

excellentatrejectinghumandnoise.

TheXLRinputsarewiredasfollows:

Pin 1 = Shield or ground

 Pin2=Positive(+orhot)

 Pin3=Negative(–orcold)

Professionalribbon,dynamic,andcondensermicsall

soundexcellentthroughtheseinputs.Themic/line

inputswillhandleanykindoflevelyoucantossat

them,withoutoverloading.

Noteveryinstrumentismadetoconnectdirectlyto

amixer.GuitarscommonlyneedaDirectInjection(DI)

boxtoconnecttothemixer'smicinputs.Theseboxes

convertunbalancedline-levelsignalsfromyourguitar,

intobalancedmic-leveloutputs,andprovidesignaland

impedancematching.Theyalsoletyousendyourgifted

guitarrenditionsoverlongcablesoraudiosnakes,

withminimuminterferenceorhigh-frequencysignal

loss.Askyourdealerorguitarmakerabouttheir

recommendationsforagoodDIbox.

Phantom Power

Mostmodernprofessionalcondensermicsare

equippedforphantompower,whichletsthemixer

sendlow-currentDCvoltagetothemic’selectronics

throughthesamewiresthatcarryaudio.(Semi-pro

condensermicsoftenhavebatteriestoaccomplishthe

samething.)“Phantom”owesitsnametoanabilityto

be“unseen”bydynamicmics(ShureSM57/SM58,for

instance),whichdon’tneedexternalpowerandaren’t

affectedbyitanyway.

The1642VLZ4’sphantompowerisgloballycontrolled

bythephantom[22]switchontherearpanel.

(Thismeansthephantompowerforallchannels

isturnedonandofftogether.)

TheGAINcontrolsforstereochannels9-10and11-12

areonlyusedtoadjusttheMicinputs.Thelineinputs

are set to unity gain.

TheGAINcontrolsforchannels13-14and15-16only

adjusttheline-levelinputs,astheyhavenoMicinputs.

4. Insert

Foundonlyonchannels1–8,theseunbalanced1/4"

jacksareforconnectingserialeffectsprocessorssuch

ascompressors,equalizers,

de-essers,orlters.Theinsertpointisafterthegain

[3]control,butbeforethechannel’sEQ[32],lowcut

[34],fader[25]andmute[30]controls.Insertcables

mustbewiredthusly:

 Tip=send(outputtoeffectsdevice)

Ring = return(inputfromeffectsdevice)

Sleeve = commonground

Eventhoughchannels1–8alreadyhavedirectout[5]

jacks,insertjackscanalsobeusedaschanneldirect

outputs;post-gain,pre-lowcut,andpre-EQ.Seethe

connector section on page 27 showing three ways to use

insert cables.

tip

This plug connects to one of the

mixer’s Channel Insert jacks.

ring

tip

ring

sleeve

SEND to processor

RETURN from processor

(TRS plug)

Neverplugsingle-ended(unbalanced)

microphones,orribbonmicsintothemic

inputjacksifthephantompowerison.

Donotpluginstrumentoutputsintothe

micinputjackswithphantompoweron

unlessyouknowforcertainitissafetodoso.

2. Line Ins

These1/4"jackssharecircuitry(butnotphantom

power)withthemicpreamps,andcanbedrivenby

balancedorunbalancedsourcesatalmostanylevel.

Youcanusetheseinputsforvirtuallyanysignalyou’ll

comeacross,frominstrumentlevelsaslowas–50dBto

operatinglevelsof–10dBVto+4dBu,asthereis45dB

ofgainavailableviathegain[3]knob.Notethat

channels1-8lineinputsareintiallyattenuatedby

15dB.Alwaysmakesuretoperformthelevelsetting

procedureonpage5.

Tolearnhowsignalsareroutedfromtheseinputs,

see the details lovingly described in the channel strip

section.

Toconnectbalancedlinestotheseinputs,use

a1⁄4"Tip-Ring-Sleeve(TRS)plug,wiredasfollows:

 Tip=Positive(+orhot)

 Ring=Negative(–orcold)

Sleeve = Shield or ground

Toconnectunbalancedlinestotheseinputs,

usea1⁄4"mono(TS)phoneplug,wiredasfollows:

 Tip=Positive(+orhot)

Sleeve = Shield or ground

3. Gain

Thesecontrolsarenotinthepatchbay,but

theyarethetoprowofknobsinthechannelstrip

section.(Theyaresovitallylinkedwiththeinputs,

thisseemedlikeagoodplacetodescribethem.)

Ifyouhaven’talready,pleasereadthelevel-setting

procedureonpage5.

Gainadjuststheinputsensitivityof

themicandlineinputs.Thisallows

signalsfromtheoutsideworldtobe

adjustedtooptimalinternaloperating

levels.

IfthesignaloriginatesthroughtheXLRjack,there

willbe0dBofgainwiththeknobfullydown,ramping

to60dBofgainfullyup.

Throughthe1⁄4"input,thereis20dBofattenuation

fullydownand40dBofgainfullyup,witha“U”(unity

gain)markat10:00.This20dBofattenuationcanbe

veryhandywhenyouareinsertingaveryhotsignal,or

whenyouwanttoaddalotofEQgain,orboth.Without

this“virtualpad,”thisscenariomightleadtochannel

clipping.

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Mackie 1642VLZ4 Owner's Manual Page 9

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