Mackie SRM150 User Manual page 13

CONNECTIONS
Inputs 1-2 accept 3-pin male XLR connectors on the
Neutrik combo inputs. They are wired as follows,
according to standards specified by the AES (Audio
Engineering Society).
XLR Balanced Wiring:
Pin 1 = Shield
Pin 2 = Hot (+)
Pin 3 = Cold (–)
The Neutrik combo inputs also accept 1/4" TRS connec-
tors. "TRS" stands for Tip-Ring-Sleeve, the three connec-
tion points available on a stereo 1/4" or balanced phone
jack or plug. TRS jacks and plugs are used for balanced
signals and stereo headphones.
1/4" TRS Balanced Mono Wiring:
Sleeve = Shield
Tip = Hot (+)
Ring = Cold (–)
1/4" TRS Stereo Unbalanced Wiring:
Sleeve = Shield
Tip = Left
Ring = Right
2
SHIELD
HOT
3 1
COLD
SHIELD 1
3
2
COLD
HOT
SHIELD
1
3 COLD
2
HOT
RING SLEEVE SLEEVE RING TIP
TIP
RING
TIP
SLEEVE
RING SLEEVE SLEEVE RING TIP
TIP
RING
TIP
SLEEVE
"TS" stands for Tip-Sleeve, the two connection points
available on a mono 1/4" phone jack or plug. They are
used for unbalanced line-level signals and the high-
impedance instrument input on Channel 1.
1/4" TS Unbalanced Wiring:
Sleeve = Shield
Tip = Hot (+)
RCA-type plugs (also known as phono plugs) and jacks
are often used in home stereo and video equipment, and
to make S/PDIF connections on consumer digital audio
devices. They are unbalanced and electrically equiva-
lent to a 1/4" TS phone plug.
SLEEVE
RCA Unbalanced Wiring:
Sleeve = Shield
Tip = Hot (+)
SLEEVE SLEEVE TIP
TIP
TIP
SLEEVE
SLEEVE TIP
TIP
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