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2

U.420 4-Channel Line Mixer

U.

4

20 4-Channel Line Mix

er

1.

  Read these instructions.  

2.

  Keep these instructions.

3.

  Heed all warnings.

4.

  Follow all instructions.

5.

  Do not use this apparatus near water.

6.

  Clean only with a dry cloth.

7.

  Do not block any ventilation openings. Install in accordance with the 

manufacturer’s instructions.

8.

  Do not install near any heat sources such as radiators, heat registers, 

stoves, or other apparatus (including amplifiers) that produce heat.

9.

  Do not defeat the safety purpose of the polarized or grounding-type 

plug. A polarized plug has two blades with one wider than the other. 

A grounding-type plug has two blades and a third grounding prong. 

The wide blade or the third prong are provided for your safety. If the 

provided plug does not fit into your outlet, consult an electrician for 

replacement of the obsolete outlet.

10.

 Protect the power cord from being walked on or pinched particularly at 

plugs, convenience receptacles, and the point where they exit from the 

apparatus.

11.

 Only use attachments/accessories specified by the manufacturer.

12.

 Use only with a cart, stand, tripod, bracket, or 

table specified by the manufacturer, or sold with 

the apparatus. When a cart is used, use caution 

when moving the cart/apparatus combination to 

avoid injury from tip-over.

13.

 Unplug this apparatus during lightning storms or 

when unused for long periods of time.

14.

 Refer all servicing to qualified service personnel. Servicing is required 

when the apparatus has been damaged in any way, such as power-

supply cord or plug is damaged, liquid has been spilled or objects have 

fallen into the apparatus, the apparatus has been exposed to rain or 

moisture, does not operate normally, or has been dropped.

15.

 This apparatus shall not be exposed to dripping or splashing, and no 

object filled with liquids, such as vases or beer glasses, shall be placed 

on the apparatus.

16. 

The AC adapter is used as the power disconnect device and should 

remain readily accessible to the user. 

17.

 NOTE: This equipment has been tested and found to comply with 

the limits for a Class B digital device, pursuant to part 15 of the FCC 

Rules. These limits are designed to provide reasonable protection 

against harmful interference in a residential installation. This 

equipment generates, uses, and can radiate radio frequency energy 

and, if not installed and used in accordance with the instructions, 

may cause harmful interference to radio communications. However, 

there is no guarantee that interference will not occur in a particular 

installation. 

If this equipment does cause harmful interference to radio or 

television reception, which can be determined by turning the 

equipment off and on, the user is encouraged to try to correct the 

interference by one or more of the following measures:

•  Reorient or relocate the receiving antenna.

•  Increase the separation between the equipment and the receiver.

•  Connect the equipment into an outlet on a circuit different from 

that to which the receiver is connected.

•  Consult the dealer or an experienced radio/TV technician for help.

  CAUTION: Changes or modifications to this device not expressly 

approved by LOUD Technologies Inc. could void the user’s authority to 

operate the equipment under FCC rules.

18.

 This apparatus does not exceed the Class A/Class B (whichever is 

applicable) limits for radio noise emissions from digital apparatus as 

set out in the radio interference regulations of the Canadian Department 

of Communications.

ATTENTION

 — 

Le présent appareil numérique n’émet pas de bruits 

radioélectriques dépassant las limites applicables aux appareils numériques de 

class A/de class B (selon le cas) prescrites dans le réglement sur le brouillage 

radioélectrique édicté par les ministere des communications du Canada.

19.

 Exposure to extremely high noise levels may cause permanent hearing 

loss. Individuals vary considerably in susceptibility to noise-induced 

hearing loss, but nearly everyone will lose some hearing if exposed to 

sufficiently intense noise for a period of time. The U.S. Government’s 

Occupational Safety and Health Administration (OSHA) has specified 

the permissible noise level exposures shown in the following chart.

  According to OSHA, any exposure in excess of these permissible limits 

could result in some hearing loss. To ensure against potentially danger-

ous exposure to high sound pressure levels, it is recommended that all 

persons exposed to equipment capable of producing high sound pres-

sure levels use hearing protectors while the equipment is in operation. 

Ear plugs or protectors in the ear canals or over the ears must be worn 

when operating the equipment in order to prevent permanent hearing 

loss if exposure is in excess of the limits set forth here.

Important Safety Instructions

Correct Disposal of this product:

 

This symbol indicates that this product should not be disposed of with your household waste, according to the WEEE Directive 

(2002/96/EC) and your national law. This product should be handed over to an authorized collection site for recycling waste electrical and electronic equipment (EEE). Improper handling 

of this type of waste could have a possible negative impact on the environment and human health due to potentially hazardous substances that are generally associated with EEE. At the 

same time, your cooperation in the correct disposal of this product will contribute to the effective usage of natural resources. For more information about where you can drop off your waste 

equipment for recycling, please contact your local city office, waste authority, or your household waste disposal service.

PORTABLE CART

WARNING

CAUTION

RISK OF ELECTRIC 

SHOCK. DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK)

NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL

The lightning flash with arrowhead symbol within an equilateral triangle is 

intended to alert the user to the presence of uninsulated "dangerous 

voltage" within the product's enclosure, that may be of sufficient magnitude 

to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the 

user of the presence of important operating and maintenance (servicing) 

instructions in the literature accompanying the appliance.

WARNING — To reduce the risk of fire or electric shock, do not 

expose this apparatus to rain or moisture.

Duration, per 

day in hours

Sound Level dBA, 

Slow Response

Typical Example 

8

90

Duo in small club

6

92

4

95

Subway Train

3

97

2

100

Very loud classical music

1.5

102

1

105

Fooyoung screaming at desTROYer about deadlines

0.5 

110

0.25 or less 115

Loudest parts at a rock concert

Summary of Contents for U.420

Page 1: ...AX 1 2 3 4 U O O MAX LEVEL U O O MAX U 14 14 U 14 14 MID LOW HIGH EQ GAIN 10 KILL U 10 KILL U U U 10 KILL U 10 KILL U 10 KILL U 10 KILL 10 KILL 10 KILL 10 KILL 10 KILL 10 KILL 10 KILL LEVEL SET LEVEL...

Page 2: ...18 This apparatus does not exceed the Class A Class B whichever is applicable limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian...

Page 3: ...AMS 6 REAR PANEL FEATURES 10 1 INSTRUMENT LINE INPUT 10 2 LINE INPUTS 10 3 PHONO INPUTS 10 4 GND TERMINAL 10 5 AUX OUTPUTS 10 6 MAIN OUTS 11 7 HEADPHONES OUTPUT 11 8 DC INPUT 11 9 FIREWIRE CONNECTION...

Page 4: ...d EQ on each channel with kill position Phono preamplifier on channel 4 accepts phono level stereo signals from a turntable Instrument level input option on channel 1 Stereo aux bus allows a separate...

Page 5: ...xer If you want to listen while you work plug headphones into the phones jack on the front panel then set the phones knob up a little 1 Play something into the selected input Be sure that the volume o...

Page 6: ...r for record ing with most DAW applications like Tracktion Cubase or Sonar This is independent of the Big Knob as well Additionally there is a stereo return from the laptop that has its own mix level...

Page 7: ...ing with most DAW applications like Tracktion Cubase or Sonar Perfect for recording your set Any play back software applications like Ableton Live or Tracktor can easily be part of your performance by...

Page 8: ...output is being sent to a pair of SRM150s on mic stands for stereo stage monitoring A laptop is connected via FireWire This laptop is loaded with awesome virtual instruments like those in applications...

Page 9: ...to channel 1 DVR decks connected to channels 2 and 3 and an iPod docking station connected to channel 4 The main outputs are fed to a pair of Mackie HR studio monitors for local monitoring and the mi...

Page 10: ...e will appear equally on the left and right of the main mix This does not apply to channel 4 3 PHONOInputs Channel 4 s RCA jacks accept stereo phono level signals from turntables Check that your turnt...

Page 11: ...meters 7 HEADPHONESOutput This 1 4 TRS stereo jack is where you plug in your stereo headphones The headphone volume is controlled by the phones level control 22 It is not affected by the main level c...

Page 12: ...players keyboards drum machines and tape players You will need a DI box if connecting instrument level signals to the inputs when this switch is out 12 GAIN These knobs allow you to adjust the gain o...

Page 13: ...In the center position U low EQ has no effect The frequency range below 300 Hz represents the realm of bass drums bass guitar fat synth patches and lower down to some really serious male singers 16 AU...

Page 14: ...blink occasionally or not at all 20 FWIN This control lets you adjust the signal level of the two FireWire channels coming in from your computer rela tive to the mix of channels 1 to 4 Adjust it care...

Page 15: ...the way down before connecting headphones or making any connec tions Keep it down until you ve put on the headphones and turn it down first whenever you play a new source or instrument 23 MAINLEVEL T...

Page 16: ...y you ll know which input source is causing the problem It helps to plug all the audio equipment into the same AC circuit so they share a common ground If the annoying humming continues ask the drum m...

Page 17: ...visit www mackie com click Support and select Locate a Service Center Service for Mackie products living outside the United States can be obtained through local dealers or distributors If you do not h...

Page 18: ...Unbalanced Wiring Sleeve Shield Tip Left Ring Right 1 4 TS Phone Plugs and Jacks TS stands for Tip Sleeve the two connection points available on a mono 1 4 phone jack or plug They are used for unbalan...

Page 19: ...ed 0 0 5 dB Distortion THD N Main and aux output 20 Hz to 20 kHz 1 kHz input signal Line input at unity gain 4 dBu input signal Better than 0 008 Phono input at unity gain 30 dBu input signal Better t...

Page 20: ...O HI MID Main Out R Aux Out R Phones Channel 4 Aux R Aux Level L R 3 Band EQ Gain LO HI MID LO HI MID Aux L Phono R Level Channel 1 L R 3 Band EQ LO HI Z HI MID LO HI MID Aux HI Z Normal FireWire In f...

Page 21: ...om the mixer is converted to digi tal signals by the FireWire interface s A D converters The following table shows the outputs to your com puter from the FireWire interface Here are two examples of us...

Page 22: ...separate virtual mixer for monitoring The U 420 ALWAYS provides zero latency monitoring by design without any extra configuration Hurrah Due to the nature of its signal path the U 420 requires the use...

Page 23: ...r guitar string to the moment you hear it in your headphones You are used to this la tency being very close to zero when you play your guitar through a guitar amp you hear the signal immediately So wh...

Page 24: ...e U 420 CD ROM into your PC s CD ROM drive 3 Click Start in the task bar then click Run and click Browse Browse to your CD drive and double click _SETUP EXE Then click OK to start the installation 4 T...

Page 25: ...you are ready to use the FireWire capabili ties of your U 420 Console PConly You should adjust the sample rate and latency from within your audio software application for example in Tracktion s setti...

Page 26: ...settings for the U 420 You can also choose the U 420 as your default input or output as well as designate it to be used for the system sound output 5 You re ready to go with any Mac OS X Core Audio h...

Page 27: ...t to an authorized service center The return ground shipment is covered for those units deemed by us to be under warranty Note You must have a sales receipt from an authorized Mackie dealer for your u...

Page 28: ...Road NE Woodinville WA 98072 USA United States and Canada 800 898 3211 Europe Asia Central and South America 425 487 4333 Middle East and Africa 31 20 654 4000 Fax 425 487 4337 www mackie com E mail s...

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