Mackie LM-3204 Owner's Manual download pdf (Page 30)

30

APPENDIX A: Connections

• Stereo Headphones, and rarely, stereo

microphones 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 microphones. They must be separated

into a left cord and a right cord which are

plugged into the two mic preamps.

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

balanced connector, a

1

⁄

4

" TRS jack or plug

is connected 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).

“XLR” CONNECTORS

Mackie mixers use 3-pin female “XLR” con-

nectors 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 (Figure A). All totally aboveboard and in

full accord with the hallowed standards dic-

tated 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 these inputs.

1

⁄4" TRS PHONE PLUGS AND JACKS

“TRS” stands for Tip-Ring-Sleeve, the

three connections available on a “stereo”

1

⁄

4

"

or “balanced” phone jack or plug. See Figure

B. TRS jacks and plugs are used in several

different applications:

2

3

1

HOT

COLD

COMMON

COMMON

COLD HOT

COMMON

COLD HOT

Figure A:

XLR Connectors

SLEEVE

TIPSLEEVE

TIP

RING

RING

TIP

SLEEVERING

Figure B: 1/4” TRS plugs

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