Mackie 1640 Appendix B: Connections, XLR Connectors, 1/4" TS Phone Plugs and Jacks, RCA Plugs and Jacks, Unbalancing a Line, Balanced Mono, Stereo Headphones

1640

Appendix B: Connections

ONYX

XLR Connectors

Channels 1-16 use 3-pin female XLR connectors on the MIC inputs. They are wired as follows, according to standards speciﬁed by the AES (Audio Engineering Society).

SHIELD 2

HOT

COLD 3 1

SHIELD 1

COLD 3 2

HOT

1SHIELD

3COLD

1/4" TS Phone Plugs and Jacks

“TS” stands for Tip-Sleeve, the two connection points available on a mono 1/4" phone jack or plug. They are used for unbalanced signals.

SLEEVE

SLEEVE TIP

TIP

SLEEVE

XLR Balanced Wiring:Pin 1 = ShieldPin 2 = Hot (+)Pin 3 = Cold (–)

HOT

1/4" TS Unbalanced Wiring:Sleeve = ShieldTip = Hot (+)

RCA Plugs and Jacks

1/4" TRS Phone Plugs and Jacks

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

RCA-type plugs (also known as phono plugs) and jacks are often used in home stereo and video equipment and in many other applications. They are unbalanced and electrically equivalent to a 1/4" TS phone plug.

SLEEVE TIP SLEEVE TIP

Balanced Mono

RING SLEEVE

SLEEVE RING TIP

TIP

RING

TIP

SLEEVE

1/4" TRS Balanced Mono Wiring:

Sleeve = Shield

Tip = Hot (+)

Ring = Cold (–)

Stereo Headphones

RING SLEEVE	SLEEVE RING TIP
TIP
	RING
	TIP
	SLEEVE

1/4" TRS Stereo Unbalanced Wiring:

Sleeve = Shield

Tip = LeftRing = Right

RCA Unbalanced Wiring:

Sleeve = Shield

Tip = Hot (+)

Unbalancing a Line

In most studio, stage, and sound reinforcement situ- ations, 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 unbal- anced input, be sure the signal high (hot) connec- tions 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 (earth) will also be connected to the ground (earth) at the unbalanced input. If there are ground-loop problems, this connection may be left disconnected at the balanced end.

ONYX 1640