Mackie HMX-56 User Manual download pdf (Page 12)

HMX-56

Appendix B: Connections

Unbalancing a Line

In most studio, stage, and sound reinforcement situations,

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

unbalanced input, use a 1/4" TRS plug on the

balanced end and a 1/4" TS plug on the unbalanced

end. Be sure the signal high (hot) connections

are wired to each other (tip to tip), and that the

balanced signal low (cold, ring) goes to the ground

(earth, shield) 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.

• When connecting an unbalanced output to

a balanced input, use a 1/4" TS plug on the

unbalanced end and a 1/4" TRS plug on the

balanced end. Be sure that the signal high (hot)

connections are wired to each other (tip to tip).

The unbalanced ground (earth) connection should

be wired to the low (cold, ring) and the ground

(earth, shield) connections of the balanced

input. If there are ground-loop problems, try

disconnecting the unbalanced ground (earth)

connection from the balanced input ground

(earth) connection, leaving the unbalanced

ground connected to the balanced input low (cold)

connection only.

In some cases, you may have to make up special

adapters to interconnect your equipment. For example,

you may need a balanced XLR female connected to an

unbalanced 1/4" TS phone plug. Many common adapters

can be found at your local electronics supply store.

Mults and “Y”s

A mult or “Y” connector allows you to route one output

to two or more inputs by simply providing parallel

wiring connections. You can make “Y”s and mults for the

outputs of both unbalanced and balanced circuits.

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.

Balanced Mono

SLEEVE

PSLEEVE

TIP

RING

TIP

SLEEVERING

1/4" TRS Balanced Mono Wiring:

Sleeve = Shield

Tip = Hot (+)

Ring = Cold (–)

Stereo Headphones

SLEEVE

PSLEEVE

TIP

RING

TIP

SLEEVERING

1/4" TRS Stereo Unbalanced Wiring:

Sleeve = Shield

Tip = Left

Ring = Right

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 like the high-impedance

instrument inputs on the Onyx 400F.

SLEEVE

TIP

PSLEEVE

TIP

SLEEVE

1/4" TS Unbalanced Wiring:

Sleeve = Shield

Tip = Hot (+)

Y-Cord Splitter

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Mackie HMX-56 User Manual Page 12

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