Mackie 1640 User Manual download pdf (Page 27)

Owner’s Manual

• When connecting an unbalanced output to a bal-

anced input, be sure that the signal high (hot)

connections are wired to each other. The unbal-

anced ground (earth) connection should be wired

to the low (cold) and the ground (earth) connec-

tions 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) con-

nection 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.

The balanced-to-unbalanced connection has been

anticipated in the wiring of Mackie jacks. A 1/4

TS plug

inserted into a 1/4

TRS balanced input, for example,

will automatically unbalance the input and make all the

right connections. Conversely, a 1/4

TRS plug inserted

into a 1/4

unbalanced input will automatically tie the

ring (low or cold) to ground (earth).

TRS Send/Receive Insert Jacks

Mackie’s single-jack inserts are three-conductor 1/4

TRS phone jacks. They are unbalanced, but have both

the mixer output (send) and mixer input (return)

signals in one connector.

The sleeve is the common ground (earth) for both

signals. The send from the mixer to the external unit is

carried on the tip, and the return from the unit to the

mixer is on the ring.

“tip”

this plug connects to one of the

mixer’s Channel Insert jacks.

“ring”

tip

ring

sleeve

SEND to processor

RETURN from processor

(TRS plug)

Using the Send Only on an Insert Jack

If you insert a 1/4

TS (mono) plug only partially (to

the ﬁ rst click) into a Mackie insert jack, the plug will

not activate the jack switch and will not open the insert

loop in the circuit (thereby allowing the channel signal

to continue on its merry way through the mixer).

This allows you to tap out the channel’s signal at that

point in the circuit without interrupting normal operation.

Note: Do not overload or short-circuit

the signal you are tapping from the

mixer. That will affect the internal

signal.

If you push the 1/4

TS plug in to the second click,

you will open the jack switch and create a direct out,

which does interrupt the signal in that channel.

Direct out with no signal interruption to master.

Insert only to first “click.”

Channel Insert jack

Direct out with signal interruption to master.

Insert all the way in to the second “click.”

For use as an effects loop.

(TIP = SEND to effect, RING = RETURN from effect)

MONO PLUG

STEREO

PLUG

Mults and “Y”s

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

to two or more inputs by simply providing parallel wir-

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

outputs of both unbalanced and balanced circuits.

Remember: Only mult or “Y” an

output into several inputs. If you need

to combine several outputs into one

input, you must use a mixer, not a

mult or a “Y.”

Y-Cord Splitter

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Mackie 1640 User Manual Page 27

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