Mackie 1640 User Manual download pdf (Page 21)

Owner’s Manual

Here are three ways you use the INSERT jacks: Note: You can safely plug this output into a micro-

phone input that provides 48 V phantom power.

54. MAIN OUT

These 1/4" TRS output connectors provide balanced

or unbalanced line-level signals. This is the same signal

that appears at the XLR MAIN OUTPUTS [52] (except

the 1/4" jacks are not affected by the MAIN OUTPUT

LEVEL switch). Connect these to the next device in the

signal chain like an external processor (graphic equal-

izer or compressor/limiter), or directly to the inputs of

the main ampliﬁ er.

55. MONO OUT

This 1/4

TRS output connector provides a balanced

or unbalanced line-level signal that is a combination

of the left and right MAIN OUT signals (L+R). You can

use this for a separate mix that doesn’t require a stereo

feed, or to simply test the monaural compatibility of

your stereo mix.

56. MONO OUT LEVEL Control

This is a separate level control for the MONO OUT. It

comes after the MAIN MIX fader but before the MAIN

OUTPUT LEVEL switch, so turning the MAIN MIX fader

up and down does affect the MONO OUT signal. With

this control turned all the way up, you’ll have 6 dB of

extra gain at the MONO OUT.

57. MAIN INSERTS

These 1/4

TRS jacks are for connecting serial effects

such as compressors, equalizers, deessers, or ﬁ lters. The

insert point is after the mix amps, but before the MAIN

MIX fader. Refer to the description of the channel insert

on the previous page to see how to make this connection.

58. TAPE IN/OUT

These RCA jacks are used to connect to the inputs and

outputs of a tape recorder or other recording device.

The TAPE IN jacks accept an unbalanced signal from

a tape recorder or other signal source (could be a CD

player, if you want) using standard hi-ﬁ hookup cables.

The signal is routed to the CONTROL ROOM/PHONES

SOURCE matrix [18]. Push in the TAPE button to route

the tape input to the CONTROL ROOM and PHONES

outputs [59/30]. This allows you to playback recordings

of your mixes.

Push in the TAPE TO MAIN MIX button [23] to route the

tape input to the MAIN OUTs [52/54]. This allows you to

playback music between sets over the main PA speakers.

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

51. TALKBACK MIC

This is where you plug in your external talkback

microphone if you need to have one. This female XLR

connector has +48 VDC phantom power always applied,

so you can use dynamic or condenser microphones.

Note: Almost all dynamic microphones can be used with

phantom power, but you might want to check the docu-

mentation that came with your microphone to be sure.

52. RIGHT/LEFT MAIN OUTPUTS

These male XLR connectors provide a balanced line-

level signal that represent the end of the mixer chain,

where your fully mixed stereo signal enters the real

world. Connect these to the inputs of your main power

ampliﬁ ers, powered speakers, or serial effects processor

(like a graphic equalizer or compressor/limiter). It pro-

vides a fully balanced signal that is the same as the 1/4"

TRS MAIN OUT jacks next door (except the 1/4" jacks

are not affected by the MAIN OUTPUT LEVEL switch).

53. MAIN OUTPUT LEVEL

When this switch is out (+4 dB), the XLR MAIN

OUTPUTS provide a +4 dBu line-level signal. When the

switch is pushed in (MIC), the signal is attenuated by

40 dB to a microphone level. You can connect the XLR

MAIN OUTPUTS to the microphone inputs of another

mixer, providing a submix for keyboards or drums, for

example, in a live sound application.

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Mackie 1640 User Manual Page 21

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