O W N E R ’ S M A N U A L4-Channel Line Mixer with FireWireOOMAX+14-14 +14-14MIDLOWHIGHEQGAINLEVELU UU UU UUUUOOMAX1 2 3 4UOOMAXLEVELUOOMAXU+14-14U+

10U.40 4-Channel Line MixerU.420 4-Channel Line MixerRear Panel Features1. INSTRUMENT/LINE InputThese inputs accept either 1/4" TRS balanced or

11Owner’s ManualOwner’s ManualIf you plug a cable into the left aux output jack, and leave the right output jack empty, the right and left signals are

1U.40 4-Channel Line MixerU.420 4-Channel Line MixerTop Panel FeaturesChannel Controls10. LEVEL SET LEDThese LEDs are used with the gain control [12

1Owner’s ManualOwner’s Manual-BAND EQThe U.420 has 3-band equalization at carefully selected points — low shelving at 300 Hz, mid peaking at 1 kHz,

14U.40 4-Channel Line MixerU.420 4-Channel Line MixerControl Section18. POWER LEDThis will light whenever the external power supply is connected to t

15Owner’s ManualOwner’s Manual1. FW LOOP OUTIn addition to a mix of channels 1 to 4, the FireWire output to the computer can contain any FireWire inp

1U.40 4-Channel Line MixerU.420 4-Channel Line MixerAppendix A: Service Information• If you are playing a guitar into channel 2, 3, or 4, you need

17Owner’s ManualOwner’s ManualRepairFor warranty repair or replacement, refer to the war-ranty information on page 27.Non-warranty repair for Mackie p

18U.40 4-Channel Line MixerU.420 4-Channel Line Mixer1/4" TRS Phone Plugs and Jacks“TRS” stands for Tip-Ring-Sleeve, the three connection points

19Owner’s ManualOwner’s ManualAppendix C: Technical InfoInput Impedance: Line input: 100 kΩ balancedPhono input: 47.5 kΩ shunt with 200 pFMaximu

U.40 4-Channel Line MixerU.420 4-Channel Line Mixer1. Read these instructions. 2. Keep these instructions.3. Heed all warnings.4. Follow all in

0U.40 4-Channel Line MixerU.420 4-Channel Line MixerBlock DiagramLRMainLRMainMain OutlevelLevelAux Out LLRAux LMain Out LPhoneslevelNOTE: Switches a

1Owner’s ManualOwner’s ManualAppendix D: FireWireSystem RequirementsThese are the minimum requirements for your com-puter system to use the U.420 Fir

U.40 4-Channel Line MixerU.420 4-Channel Line MixerThe U.420’s built in FireWire connection allows over-dub style recording to a Mac or PC digital

Owner’s ManualOwner’s Manual* In Tracktion, it is not necessary to mute the output of the track you are overdubbing on. Instead, select the input to

4U.40 4-Channel Line MixerU.420 4-Channel Line MixerSoftware installationFor the PC:When using the mixer with a PC, it is necessary to first install

5Owner’s ManualOwner’s Manual9. Wait until the “Found New Hardware Wizard” pops up. Do not select any options, just click “Cancel” to continue. If t

U.40 4-Channel Line MixerU.420 4-Channel Line MixerFor the Mac:Macintosh OS X Audio MIDI Setup (version 10..9 or later):Macintosh OS X does not re

7Owner’s ManualOwner’s ManualU.420 Limited WarrantyPlease keep your sales receipt in a safe place.A. LOUD Technologies Inc. warrants all materials, w

16220 Wood-Red Road NE • Woodinville, WA 98072 • USAUnited States and Canada: 800.898.3211Europe, Asia, Central and South America: 425.487.4333Middle

Part No. SW0556 Rev. D 02/08 ©2007-2008 LOUD Technologies Inc. All Rights Reserved.Owner’s ManualOwner’s ManualNeed help with your new U.40 Mixer?•

4U.40 4-Channel Line MixerU.420 4-Channel Line MixerIntroductionThank you for choosing a Mackie U.420 mixer. It contains all your favorite features i

5Owner’s ManualOwner’s ManualGetting StartedREAD THIS PAGE!!Even if you never read manuals, please read and digest the safety instructions on page 2,

U.40 4-Channel Line MixerU.420 4-Channel Line MixerHookup DiagramsProduction studioThis diagram shows a stereo synth, and a drum machine connected t

7Owner’s ManualOwner’s ManualLive performance systemThis diagram shows a guitar connected to channel 1, plus a stereo synth and drum machine connected

8U.40 4-Channel Line MixerU.420 4-Channel Line MixerKeyboardist’s submixerGNDPHONOR1234RLPOWER18V,1.5AOUTMAINOUTAUX(MONO)RL(MONO)LRL(MONO)L(MONO)LR R

9Owner’s ManualOwner’s ManualVideo edit bayGNDPHONOR1234RLPOWER18V,1.5AOUTMAINOUTAUX(MONO)RL(MONO)LRL(MONO)L(MONO)LR RDesktop computer and large displ