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29

Unbalancing a Line

In most studio, stage, and sound reinforce-

ment situations, there is a combination of
balanced and unbalanced inputs and outputs
on the various pieces of equipment. This
usually will not be a problem in making
connections.

• When connecting a balanced output to

an unbalanced input, be sure the signal high
(hot) connections are wired to each other, and
that the balanced signal low (cold) goes to the
ground (earth) connection at the unbalanced
input. In most cases, the balanced ground will
also be connected to the ground at the unbal-
anced input. If there are ground-loop problems,
this connection may be left disconnected at the
balanced end.

• When connecting an unbalanced output

to a balanced input, be sure that the signal
high (hot) connections are wired to each
other. The unbalanced ground (earth) connec-
tion should be wired to the low and the ground
connections of the balanced input. If there are
ground-loop problems, try connecting the un-
balanced ground connection only to the input
low connection, and leaving the input ground
connection disconnected.

• In some cases, you will have to make up

special adapters to interconnect your equip-
ment. For example, you may need a balanced
XLR female connected to an unbalanced 1/4"

6. Write the RA number in 

BIG PRINT

 on

top of the box.

7. Ship the powered mixer to us. We suggest

insurance for all forms of cartage. Ship to
this address:

Mackie Designs

SERVICE DEPARTMENT

16140 Wood-Red Rd. NE, Ste. 5

Woodinville, WA 98072

Balanced Lines

Balanced lines offer increased immunity

to external noise (specifically, hum and buzz).
Because a balanced system is able to minimize
noise, it is the preferred interconnect method,
especially in cases where very long lengths of
cable are being used. A long unbalanced cable
carries with it more opportunity for noise to get
into a system — having balanced inputs means
very little noise will enter the system via snakes
and other cables that typically must run a long
length.

A balanced line is a three-wire system where

two wires carry the signal and the third is a
ground wire that shields the inner conductors
from EMI. The two inner conductors carry the
same signal, but with opposite polarity. The
balanced input amplifies only the difference
between the two conductors. But a signal that
is common to both conductors, and in phase, is
rejected (canceled out) at the balanced input.
This includes hum from AC lines or other EMI
induced noise.

An unbalanced line does not have this

noise-rejecting capability because it has only
two conductors. One conductor carries the sig-
nal and the other is a ground wire that shields
the inner conductor. Any hum or EMI noise
that gets through the shield is added to the sig-
nal and amplified at the unbalanced input.
Often the hum can be louder than the signal itself!

APPENDIX B: Some Arcane Mysteries Illuminated

8. We’ll try to fix the mixer within three

business days. Ask Tech Support for
current turn-around times when you call
for your RA number. We normally send
everything back prepaid using UPS Orange
(three-day air). However, if you rush your
powered mixer to us by next-day air, we’ll
treat it in kind by shipping it back the same
way in which it was received. This para-
graph does not necessarily apply to
non-warranty service.

Summary of Contents for 406M

Page 1: ...LINE LINE LINE INSERT 15 U O O 1K 500 250 63 125 16K LEVEL 2K 4K 8K MAIN MASTER EFX TO MAIN U O O 10 MASTER OUTPUT SECTION LINE U 12dB O O L R R L POWER OUT MONITOR EQUALIZER 15 15 5 10 0 5 10 15 15 5...

Page 2: ...pr sent appareil num rique n met pas de bruits radio lectriques d passant las limites applicables aux appareils num riques de class A de class B selon le cas prescrites dans le r glement sur le broui...

Page 3: ...ally dangerous exposure to high sound pressure levels it is recommended that all persons exposed to equipment capable of producing these levels use hearing protectors while this unit is in operation E...

Page 4: ...s and we ve applied what we ve learned to the mechanical design of our powered mixers Reliability is paramount to sound reinforce ment That s why our engineers have subjected our powered mixers to the...

Page 5: ...ON 18 EFX TO MON 19 MONITOR MASTER 19 EFX TO MAIN 19 MAIN MASTER 19 LEVEL Meters 19 PHANTOM POWER Switch 19 BREAK Switch 20 POWER AMP ROUTING 20 COMPRESSOR 20 TAPE IN LEVEL 20 POWER switch 21 MAKING T...

Page 6: ...controls to center including the graphic EQ sliders Turn down the MAIN MASTER and MONITOR MASTER controls 2 If your microphone is a condenser mic push in the PHANTOM POWER switch If you are using bot...

Page 7: ...0 0 5 10 1K 500 250 63 125 16K 2K 4K 8K MONITOR MASTER EFX TO MON U O O 10 U 12dB O O 75Hz RUMBLE REDUCTION LEFT RIGHT LEFT RIGHT MIC 7 MIC 8 75Hz RUMBLE REDUCTION PHANTOM POWER CH 1 8 BREAK MUTES CH...

Page 8: ...EFX TO MON U O O 10 U 12dB O O 75Hz RUMBLE REDUCTION RIGHT RIGHT MIC 7 MIC 8 75Hz RUMBLE REDUCTION PHANTOM POWER CH 1 8 BREAK MUTES CH 1 6 408S POWER AMP ROUTING SM ROOM MD PLATE LG PLATE LG HALL GATE...

Page 9: ...INE HI Z SUM MONO MIC LINE HI Z AMP 1 MAIN MAIN MONITOR AMP 2 MAIN SM ROOM MD PLATE LG PLATE LG HALL GATED REVERSE CATHEDRAL MD HALL SPRING PHASER DELAY 4 CHORUS DELAY 3 DELAY 1 FLANGE DELAY 2 IN OUT...

Page 10: ...EDUCTION RIGHT RIGHT MIC 7 MIC 8 75Hz RUMBLE REDUCTION PHANTOM POWER CH 1 8 BREAK MUTES CH 1 6 808S POWER AMP ROUTING SM ROOM MD PLATE LG PLATE LG HALL GATED REVERSE CATHEDRAL MD HALL SPRING PHASER DE...

Page 11: ...PHASER DELAY 4 CHORUS DELAY 3 DELAY 1 FLANGE DELAY 2 IN OUT STEREO MAINS LEFT MAIN RIGHT MONITOR 2 X 400W STEREO PROFESSIONAL POWERED MIXER LEVEL 30 CLIP 5 5 0 10 15 20 L R LEFT MONO LEFT MONO STEREO...

Page 12: ...10 15 20 L R LEFT MONO LEFT MONO STEREO MIC LINE HI Z STEREO MIC LINE HI Z U O O 10 U 15 15 U 15 15 U 12 12 1 U 20dB O O HI LOW NORMAL U O O 15 U O O 10 U 15 15 U 15 15 U 12 12 U 20dB O O HI LOW NORM...

Page 13: ...BREAK MUTES CH 1 6 808S POWER AMP ROUTING SM ROOM MD PLATE LG PLATE LG HALL GATED REVERSE CATHEDRAL MD HALL SPRING PHASER DELAY 4 CHORUS DELAY 3 DELAY 1 FLANGE DELAY 2 IN OUT STEREO MAINS LEFT MAIN R...

Page 14: ...obs cut as well as the right boost EFX MON HI 12kHz MID 2 5kHz LOW 80Hz PAN VOLUME CH 1 INPUT LEVEL SET MIC 1 INSERT LINE U O O 10 U 15 15 U 15 15 U 12 12 1 U 20dB O O HI LOW NORMAL U O O 15 R L Stere...

Page 15: ...is controlled by the MONITOR MASTER control Themonitorsendsignalispre EQandpre VOLUME soifyouadjustthesecontrolstheywill affectonlythemainmixandnotthemonitormix Each MON send control ranges from off...

Page 16: ...rfect for vocals and snare Decay range adjustable from 1 second to 5 seconds No pre delay MD PLATE Good early reflections and no pre delay Tails are short and warm with strong high end for increased p...

Page 17: ...the effect Rate which is the speed of the sweeping effect Fully counter clockwise produces the slowest sweeps and fully clockwise produces the fastest DAMPING DEPTH PARAMETER controls the effect depth...

Page 18: ...Note Make sure the singer is within 3 to 6 inches of the microphone No amount of EQ can save a vocal when the singer is too far away from the microphone 2 For more presence set the 4K and 8K sliders...

Page 19: ...al level at the MONITOR LINE OUT and the MIXER LINE OUT To attain the best signal to noise ratio while still maintain ing adequate headroom set the MONITOR MASTER and MAIN MASTER controls so the 0 dB...

Page 20: ...our monitor speakers When the switch is pushed IN the main mix is routed to the input of the MAIN power amp and the monitor mix is routed to the input of the MONITOR power amp You can still con nect u...

Page 21: ...rip 2 2 3 1 1 SHIELD COLD HOT SHIELD COLD HOT 3 SHIELD COLD HOT 3 2 1 Balanced XLR Connectors SLEEVE SHIELD TIP SLEEVE TIP HOT RING COLD RING TIP SLEEVE RING Balanced 1 4 TRS Plug MAKING THE CONNECTIO...

Page 22: ...a TS plug like a guitar plug or if it s a TRS plug like a headphone plug make sure the ring is tied to the shield preferably at the source You can connect an input signal to both the MIC input and th...

Page 23: ...el Inserts section to see how to make this connection Parallel effects device Plug a TS plug half way into the EFFECTS SEND jack to the first click This allows you to use the EFFECTS SEND jack as a di...

Page 24: ...the other band can plug right into the PPM Series and use its amplifiers and con nected speakers see application diagram on page 13 MIXER LINE OUT This is a 1 4 connector that produces an unbalanced l...

Page 25: ...everyone around you Rear Panel Connections SPEAKER OUT This is a 1 4 connector that produces an unbalanced speaker level signal Use 1 4 TS speaker cables to connect the SPEAKER OUTs to the inputs of y...

Page 26: ...holdstheACoutletfaceplateinplace This center screw must be grounded You can check it by connecting the adapter to the outlet and then plugging in your handy dandy AC outlet tester Thermal Consideratio...

Page 27: ...ling If the other side is louder now the problem is with the mixer the amp or the signal source Warranty Service If you think your powered mixer has a prob lem please do everything you can to confirm...

Page 28: ...R based device on the same AC circuit as the powered mixer Use an AC line filter or plug the powered mixer into a differ ent AC circuit Is there an external processor or other electronic device connec...

Page 29: ...unity to external noise specifically hum and buzz Because a balanced system is able to minimize noise it is the preferred interconnect method especially in cases where very long lengths of cable are b...

Page 30: ...t one end Some times this can be true but for most 99 audio systems it is unnecessary If you do ev erything else correctly you should be able to connect every component of your audio system using stan...

Page 31: ...le Rate 31 25kHz Bandwidth 15 6kHz VU Meters Main and Monitor 8 segments Clip 5 0 5 10 15 20 30 APPENDIX C Technical Info Specifications PPM Series Powered Mixers 406M 408M 408S 808M 808S Mixer Sectio...

Page 32: ...40VAC 50Hz Japan 100VAC 50 60Hz Korea 220VAC 60Hz Capable of operation from 75 to 110 of rated line voltage Physical Height 11 7 inches 297mm Width 20 5 inches 521mm Overall Depth 13 inches 330mm Weig...

Page 33: ...6 EFX AND MONITOR PHANTOM L R EFX MON L R EFX EFX TO MONITOR EFX TO MAIN EFX BYPASS EFX CLIP EFX RETURN L EFX SEND LEFT POWER AMP IN AMP ROUTING TAPE IN TAPE OUT L STEREO MAINS MAIN MONITOR MONITOR E...

Page 34: ...NITOR PHANTOM MAIN EFX MON MAIN EFX EFX TO MONITOR EFX TO MAIN EFX BYPASS EFX CLIP EFX RETURN MIXER LINE OUT AMP ROUTING TAPE IN TAPE OUT L MAINS MAIN MONITOR MONITOR EFX VOLUME MONITOR EFX TRIM INPUT...

Page 35: ...35 NOTES...

Page 36: ...rope Asia Central South America 425 487 4333 Middle East Africa 31 20 654 4000 Fax 425 487 4337 www mackie com E mail sales mackie com Some of the people at our factory who helped design build sell an...

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