Toa CX-124, CX-164 Operating Instructions Manual

Operating Instructions

MIXING CONSOLE

CX-124

CX-164

Please follow the instructions in this manual to obtain the optimum results from
these units. We also recommend you to keep this manual handy for future re­ference.

TOA Corporation

KOBE, JAPAN

Contents

Precautions

General description

Features

Panel facilities

Front panel

[Channel input section]
[Aux Return input/Stereo IN input section]

[Output section]

Rear panel

Connection diagram for CX-124 and CX-164
Assembling input transformers

Specifications for input transformers
Input and output specifications

Characteristic diagrams
Block diagram
Level diagram
General specifications
Dimensional diagrams

Precautions

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Power supply
Use within AC mains ± 10% (50Hz/60Hz)

Power switch
The power switch should be ON after all connections have been completed.
When the power switch is turned to ON/OFF, turn all of the output level controls to minimum position
to prevent damage to speakers, etc.

XLR type audio connectors are factory-wired as follows:
Pin 1 ground (shield), pin 2 cold (low, minus) and pin 3 hot (high, plus).

Where microphone cables connected to unit close to the cables of the lighting system, noise may
arise from it. Do not close each cable. In such the case, use the 4-quad shielded microphone
cables.

Do not spill a liquid like water nor place inflammables or metal like hairpins inside unit. Their entry will
result in an electric shock and equipment failure.

Avoiding to install unit at following places:

exposing to direct sunlight
with high ambient temperature or adjacent to heat-generating equipment
exposing to high humidity or dust levels
susceptible vibration
close to equipment arising hum or noise.

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General description

The TOA CX-124 is a mixing console with 12 input channels, 4 Group outputs, 1 Stereo output (L-R) and

1 Sum output, and the TOA CX-164 is a mixing console with 16 input channels, 4 Group outputs, 1

Stereo output ( L- R) and 1 Sum output. These mixing consoles are designed for use in professional
sound reinforcement systems such as various concerts, recordings in the studio, etc., and provide the
versatility necessary to meet a wide range of requirements. The high performance and modular con­struction assures reliability, easy maintenance, and service-ability.

Features

2-channel Stereo input is provided in addition to the channel input, and can be connected to a stereo
playback deck and other auxiliary equipment without reducing the channel inputs.

An input transformer can be assembled optionally.

Pan pot control on each input channel directly assigns the fader output signal of the channel to

Stereo L and R, which is used as either six Group out busses or four Group out busses + Stereo L

and R busses.

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Panel facilities (Front panel)

[Channel input section]

Pad Switch [PAD]

Pad switch inserts a –20 dB pad ahead of the head amplifier. Adjust the PAD switch,
depending on the output level of microphones or associated equipment.

Signal/Peak LED Indicator [SIG/PEAK]

The dual color LED indicator lights green when the pre-EQ signal level reaches 20 dB

before from nominal level, and turns red when the signal level reaches 6 dB below clip-

ping, giving a visual reference for optimum setting of the trim control.

Input Trim Control [TRIM]

The Trim control adjusts the gain of the preamplifier stage of the associated channel,
providing 40 dB of gain control. The Trim control and Pad switch of each channel

should be properly adjusted so that the peak LED is just being to turn red from green

or only flash red occasionally. This will ensure lowest distortion level and optimum sig­nal to noise ratio.

High Equalizer Control [HIGH]

The High EQ control alters the high frequency response of the input channel, providing

±15 dB at continuously variable active shelving equalization. The "0" detent position

provides flat audio response.

Mid Equalizer Control [MID]/Mid Equalizer Center Frequency Control [MID FREQ]

The Mid EQ frequency control alters the center frequency of the Mid EQ control in the

range from 300 Hz to 4 kHz.

The Mid EQ control alters the mid frequency response of the input channel, providing

±15 dB at the center frequency of peaking equalization. The "0" detent position pro-

vides flat audio response.

Low Equalizer Control [LOW]

The Low EQ control provides ±15 dB at continuously variable active shelving equaliza-

tion. The "0" detent position provides flat audio response.

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Aux 1 Control [AUX 1]

This control determines the level of the pre-EQ and pre-fader input signal to be fed to the Aux 1

buss. The position provides nominal level.

Aux 2 Control [AUX 2]/Pre-fader, Post-fader Select Switch

This control determines the level of the input signal to be fed to the Aux 2 buss. The Aux 2 control is

associated with the pre-post EQ and fader selector switch, which permits its assign to be either pre

or post EQ and fader.

The position provides nominal level.

Aux 3 Control [AUX 3]

This control determines the level of the post-fader input signal to be the Aux 3 buss. The position

provides nominal level.

Pan Pot

This control assigns the input signal of each input to the Group 1 and 2, or 3 and 4, or Stereo L and

[PAN]

R busses selected by assign switch for localization of sound image.

Channel Switch [CH]

This switch connects or disconnects the input signal to the mixing busses. The LED indicator lights

orange when the channel on/off switch is "on".

Assign Switch [1·2, 3·4, L·R]

This switch selects the buss the signal input to each channel is to be transmitted to. It is possible to

place busses assigned by the Pan pot control. Setting all of the Group to Stereo switches on the out­put section to OFF turns the Stereo L and R busses into Group busses, increasing the number of

Group busses to six.

Cue Switch [CUE]

The Cue switch is for monitoring the pre-fader signal in each input channel through Headphones and

Cue output. The switch is a "push-on push-off" type. When more than two switches are "on", the sig-

nals are combined.

Channel Fader

The fader provides continuously variable adjustment of the channel's output to the mixing busses.

The nominal level is at the "0" position, with the fader retaining a 6 dB margin.

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