Mackie 1642-VLZ3 User Manual download pdf (Page 25)

Owner’s Manual

“XLR” Connectors

Mackie mixers use 3-pin female “XLR” connectors on

all microphone inputs, with pin 1 wired to the grounded

(earthed) shield, pin 2 wired to the “high” (”hot” or

positive polarity) side of the audio signal and pin 3

wired to the “low” (“cold” or negative polarity) side of

the signal. See Figure A. This is all totally aboveboard

and in full accord with the hallowed standards dictated

by the AES (Audio Engineering Society).

Use a male “XLR”-type connector, usually found on the

nether end of what is called a “mic cable,” to connect to

a female XLR jack.

⁄4" TRS Phone Plugs and Jacks

“TRS” stands for Tip-Ring-Sleeve, the three

connections available on a “stereo”

⁄4" or “balanced”

phone jack or plug. See Figure B.

TRS jacks and plugs are used in several different ap-

plications:

• Stereo Headphones, and rarely, stereo micro-

phones and stereo line connections.

When wired for stereo, a 1⁄4" TRS jack or plug

is connected tip to left, ring to right and sleeve

to ground (earth). Mackie mixers do not

directly accept 1-plug-type stereo micro phones.

They must be separated into a left cord and a

right cord, which are plugged into the two mic

preamps.

Appendix B: Connections

You can cook up your own adapter for a stereo

microphone adapter. “Y” two cables out of a

female 1⁄4" TRS jack to two male XLR plugs,

one for the Right signal and one for the Left.

• Balanced mono circuits. When wired as a bal-

anced connector, a 1⁄4" TRS jack or plug is con-

nected tip to signal high (hot), ring to signal

low (cold), and sleeve to ground (earth).

• Unbalanced Send/Return circuits. When wired

as send/return “Y” connector, a 1⁄4" TRS jack

or plug is connected tip to signal send (output

from mixer), ring to signal return (input back

into mixer), and sleeve to ground (earth).

⁄4" TS Phone Plugs and Jacks

“TS” stands for Tip-Sleeve, the two connections avail-

able on a “mono” 1⁄4" phone jack or plug. See Figure C.

TS jacks and plugs are used in many different

applications, always unbalanced. The tip is connected to

the audio signal and the sleeve to ground (earth). Some

examples:

• Unbalanced microphones

• Electric guitars and electronic instruments

• Unbalanced line-level connections

Switched

⁄4" Phone Jacks

Switches can be incorporated into 1⁄4" phone jacks,

which are activated by inserting the plug. These switch-

es may open an insert loop in a circuit, change the input

routing of the signal or serve other functions. Mackie

uses switches in the channel insert and bus insert jacks,

input jacks and AUX returns. We also use these switches

to ground the line-level inputs when nothing is plugged

into them.

In most cases, the plug must be inserted fully to

activate the switch. Mackie takes advantage of this in

some circuits, specifying circumstances where you are

to insert the plug only partially. See Special Mackie

Connections, on the next page.

SLEEVE

TIP

TIPSLEEVE

TIP

SLEEVE

Figure C: TS Plug

SHIELD

COLD

HOT

SHIELD

COLD

HOT

SHIELD

COLD

HOT

Figure A: XLR Connectors

SLEEVE

TIPSLEEVE

TIP

RING

TIP

SLEEVERING

Figure B: " TRS Plugs

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Mackie 1642-VLZ3 User Manual Page 25

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