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APPENDIX A: CONNECTIONS
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 sepa-
rated 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).
1
⁄4" TS PHONE PLUGS AND JACKS
“TS” stands for Tip-Sleeve, the two connec-
tions available on a “mono”
1
⁄
4
" phone jack or
plug (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
“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 po-
larity) side of the audio signal and pin 3
wired to the “low” (“cold” or negative polar-
ity) side of the signal (Figure A). All totally
aboveboard and in full accord with the hal-
lowed 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.
SLEEVE
TIPSLEEVE
TIP
RING
RING
TIP
SLEEVERING
Figure B:
1
⁄
4
" TRS Plugs
Figure A: XLR Connectors
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:
• Stereo Headphones, and rarely, stereo
microphones and stereo line connections.
When wired for stereo, a
1
⁄
4
" TRS jack or
SLEEVE
TIP
TIPSLEEVE
TIP
SLEEVE
Figure C: TS Plug
2
2
3
1
1
SHIELD
COLD
HOT
SHIELD
COLD
HOT
3
SHIELD
COLD
HOT
3
2
1