Clockaudio MR88 Manuale utente

CLOCKAUDIO

MR88 Automatic Microphone Mixer

Version 4.2

ClockaudioLimited,22 Arnside Road

WATERLOOVILLE

Hampshire. UK

Tel : +44 (0)2392 251193 Fax : +44 (0)2392 251201

Email : sales@clockaudio.co.uk

Page 2

CONTENTS

INTRODUCTION............................................................................................................ 3

Features............................................................................................................................. 4

MR88 Front Panel ............................................................................................................ 5

MR88 Rear Panel ............................................................................................................. 6

MR88 Menu Functions..................................................................................................... 7

Changing Channels and Functions............................................................................... 9

Changing Values. ......................................................................................................... 9

Explanation of Functions................................................................................................ 10

Output A+B Functions: .............................................................................................. 10

Functions of Channels 1 – 8:...................................................................................... 10

Mono/Stereo ............................................................................................................... 10

Line/Mic/Phantom...................................................................................................... 10

Gain Control - Pre-Amplifier ..................................................................................... 10

Compression............................................................................................................... 11

Equaliser..................................................................................................................... 11

Output - Selection....................................................................................................... 11

Priority Select Function.............................................................................................. 11

Gating – Off Attenuation Level Control .................................................................... 11

Detector - Adjustable Detector Control...................................................................... 12

Hold - Time ................................................................................................................ 12

NOMA (Number of Open Microphones Attenuated) Control ................................... 12

System Functions: .......................................................................................................... 13

Priority........................................................................................................................ 13

Last Active Channel ................................................................................................... 13

Security Code ............................................................................................................. 13

Active Control Outputs............................................................................................... 14

Control Inputs............................................................................................................. 16

VCA - Control............................................................................................................ 17

External Control Port...................................................................................................... 18

Link In/Out - Daisy Chain Capability ............................................................................ 19

RS232 Control................................................................................................................ 19

Installation...................................................................................................................... 20

Basic Set-up for Microphones.................................................................................... 20

Security Mode ................................................................................................................ 21

How to Change the Security Code: ............................................................................ 21

How to Lock the Mixer: ............................................................................................. 21

How to Unlock the Mixer:.......................................................................................... 21

Lost Security Code:.................................................................................................... 21

Specifications ................................................................................................................. 22

Page 3

INTRODUCTION

The MR88 automatic microphone mixer incorporates advanced DSP

technology. It has been carefully designed to give outstanding performance

and flexibility while maintaining simplicity of set up and use. Eight input

channels, fully adjustable for microphone and line levels, can be set up to be

put onto either or both of the two output channels. Active input channels can

be automatically detected. Each input channel can be set to a multi-level

priority system. This allows "one at a time operation", "all channels active" or

combinations with chairman priorities. When no one is talking, a constant

ambient sound can be maintained through the system by setting the last

microphone selected to automatically stay on. Mixers may be chained

together to make a large multi-source system with priority and NOMA

information extending throughout. With two independent output channel

busses provided, the MR88 to be used as a genuine 8 X 2 mixer.

The input level control and priority system of this mixer makes it uniquely

versatile for many diverse applications. The MR88 mixer is ideal for places of

worship, courtroom proceedings, meetings, seminars and general A/V

applications.

The MR88 uses microprocessor control and provides full setup and control of

the mixer via a user-friendly LCD interface on the front panel. This allows the

mixer settings to be selected and adjusted without the need to remove the

case covers. All settings are retained, even when the mixer is disconnected

from the mains power supply. The mixer front panel can be easily 'locked'

with an adjustable four digit security code to prevent the mixer settings being

accidentally changed, or to 'tamper proof' the settings.

The MR88 also has the ability to be daisy chained with other MR88 mixers

via a link cable (available separately), to give a multi-mixer system.

Page 4

Features

Input Features

•8 Channel balanced mic/line inputs on XLR connectors.

•48V phantom power selectable for each microphone input channel.

•Assignable input pairs for stereo sources.

•Adjustable compressor for each input channel.

•2 Band Equalisation on each input channel.

•Adjustable off attenuation for each channel.

•Detector modes for speech, music and manual threshold level.

•Adjustable detector hold time for each input channel.

•Four levels of assignable priority for each input channel.

•Recorder outputs for each input channel.

•NOMA compensation selectable for each channel

•Assignable to either or both output channel busses.

Output Features

•2 Channel balanced line outputs on XLR connectors.

•Independent or linked gain control of output channels.

•Mixed output available from any mixers in chain for multi-zone control.

System Features

•Easy set up with LCD display of all functions and settings from front

panel.

•LED level meter to monitor any input or output channel.

•Monitor headphone output to monitor any input or output channel.

•Mixers can be linked to create larger systems of microphones.

•Each priority can be set for inclusive (all channels active) or exclusive

(one at a time operation)

•Selectable last microphone on operation to maintain ambient sound.

•Security mode to protect settings.

•External VCA control of output channel gains.

•External logic level control and monitoring of channel selection.

Page 5

MR88 Front Panel

Power

Monitor

Output LevelControls

Selected Channel

-20

-10

-6

-3

6 7 8

O/L

Channel

Function

CLOCKAUDI O

MR88

1) Power Switch.

2) Display. Displays selected channel/function and settings for each.

3) Channel Buttons. Select between System settings, Output channels A

and B, and Input Channels 1-8.

4) Function Buttons. Selects set-up functions for each channel.

5) Rotary Control. Adjusts the settings on each function.

6) LED Level meter Indicates peak output level of the selected channel in

dB.

7) The Selected Channel LEDs indicates which microphone is currently

in use and which other microphones are being "locked out"

(attenuated). Green is active and Red is locked out.

8) Monitor Volume Control. Adjusts headphone amplifier volume.

9) Headphone Output. 1/4" TRS jack. Monitors the selected channel.

Page 6

MR88 Rear Panel

External Control Link In

A B

Link OutRS232

Outputs Input Channels

Pre-Amp Outputs 678 5 4 3 2 1

Input

7 5 3 1

8 6 4 2

CLOCKAUDIO

Made in EEC-UK

1) External Control Connector. Provides access to the open-collector

outputs, the external control inputs, and the two VCA connections.

2) RS232 Connector. For control and setup of MR88 mixers. Control

extends through link connections to multiple mixers.

3) Link In/Out. Used for daisy chaining of multiple MR88 mixers when

more than 8 input channels are required. Uses standard RJ45 network

leads.

4) Balanced Outputs. The MR88 has two XLRM-type connectors with

individually or linked adjustable output gains to give nominal output

levels of -60 to 0dBV. This can be setup to be controlled by external

VCA’s for remote operation.

5) Pre-Amp Outputs. Individual channel –10dBV outputs on RCA phono

connectors for tape recording pre-mix channels.

6) Source Inputs. XLRF-type connectors. Balanced inputs for low

impedance dynamic or condenser microphones, line inputs and audio

equipment (CD players etc). Input gain adjustable from front panel.

48V phantom power can be selected from front panel for microphones.

7) Power Input. External 15V power supply.

Page 7

MR88 Menu Functions

Navigation through the menu system is via the CHANNEL (

↔

) and

FUNCTION (

↔

) buttons. The table below illustrates the structure of the

menu.

Output Ch 1 Ch 2 Ch 3 Ch 4 Ch 5 Ch 6 Ch 7 Ch 8 System

Channel

A+B Gain

Mono /

Stereo Mono /

Stereo Priority 1

mode

Channel

A Gain MicPhant/

Mic/Line MicPhant/

Mic/Line Priority 2

mode

Channel

B Gain MONO

Gain MONO

Gain Priority 3

mode

Channel

A Source

STEREO

Gain L+R

STEREO

Gain L+R

STEREO

Gain L+R

STEREO

Gain L+R

STEREO

Gain L+R

STEREO

Gain L+R

STEREO

Gain L+R

STEREO

Gain L+R

Priority 4

mode

Channel

B Source

STEREO

Gain Left STEREO

Gain Left Last One

STEREO

Gain Right

STEREO

Gain Right

STEREO

Gain Right

STEREO

Gain Right

STEREO

Gain Right

STEREO

Gain Right

STEREO

Gain Right

STEREO

Gain Right

Code

Compress

Control

Outputs

EQ Lo EQ Hi EQ Hi EQ Hi EQ Hi EQ Hi EQ Hi EQ Hi Control

Inputs

EQ Hi EQ Lo EQ Lo EQ Lo EQ Lo EQ Lo EQ Lo EQ Lo VCA

Output to Output to Output to Output to Output to Output to Output to Output to

Priority Priority Priority Priority Priority Priority Priority Priority

Gate Off Gate Off Gate Off Gate Off Gate Off Gate Off Gate Off Gate Off

Detector Detector Detector Detector Detector Detector Detector Detector

Manual

Detect

Level

Manual

Detect

Level

Manual

Detect

Level

Manual

Detect

Level

Manual

Detect

Level

Manual

Detect

Level

Manual

Detect

Level

Manual

Detect

Level

Hold time

NOMA NOMA NOMA NOMA NOMA NOMA NOMA NOMA

Page 8

Menu System

Output Ch 1 Ch 2 Ch 1 + 2 System

Gain Ch A+B

-60dB – 0dB Input Type

Mono/Stereo Input Type

Stereo/Mono Priority 1 mode

Inclusive/

Exclusive

Gain Ch A

-60dB – 0dB Input Level

Mic + Phantom

/Mic/Line

Input Level

Mic + Phantom

/Mic/Line

Input Level

Mic + Phantom

/Mic/Line

Priority 2 mode

Inclusive/

Exclusive

Gain Ch B

-60dB – 0dB Gain

-40dB - +20dB Gain

Left

-40dB - +20dB

Priority 3 mode

Inclusive/

Exclusive

Source Ch A

Off/X/Y/

X+Y

Gain

Right

-40dB - +20dB

Priority 4 mode

Inclusive/

Exclusive

Source Ch B

Off/X/Y/

X+Y

Gain

Left + Right

-40dB - +20dB

Last Active

Channel

On / Off

Compression

Off/1 – 8/Max Compression

Off/1 – 8/Max Security Lock Code

0000 - 9999

change digit 1

EQ Lo

-12dB - +12dB EQ Lo

-12dB - +12dB Security Lock Code

0000 - 9999

change digit 2

EQ Hi

-12dB - +12dB EQ Hi

-12dB - +12dB Security Lock Code

0000 - 9999

change digit 3

Output to

Off/BusX/BusY/

BusX+BusY

Output to

Off/BusX/BusY/

BusX+BusY

Output to

Off/BusX/BusY/

BusX+BusY/Stereo

Security Lock Code

0000 - 9999

change digit 4

Priority

1 - 4 Priority

1 - 4 Control Outputs

High/

Low

Gate Off Atten

6dB - 40dB

+ Mute

Gate Off Atten

6dB - 40dB

+ Mute

Gate Off Atten

6dB - 40dB

+ Mute

Control Inputs

Force off /

Force on

Detector Type

Auto speech/

Auto music/

Manual

Force On

Force Off

Detector Type

Auto speech/

Auto music/

Manual

Force On

Force Off

Detector Type

Auto speech/

Auto music/

Manual

Force On

Force Off

VCA Control

VCA1 off VCA2 off

VCA1 ChA VCA2 off

VCA1 ChB VCA2 off

VCA1 ChA+B VCA2

off

VCA1 ChA VCA2

ChB

Manual Detector

-40dB to 0dB Manual Detector

-40dB to 0dB

Hold time

50mS/100mS/

200mS/500mS

/1S / 2S

Hold time

50mS/100mS/

200mS/500mS

/1S / 2S

Hold time

50mS/100mS/

200mS/500mS

/1S / 2S

NOMA

On/Off NOMA

On/Off

Page 9

Changing Channels and Functions.

On power up, if the MR88 is not locked, the channel is set to Output A+B and

the function to Gain Channel A and B. Pressing the CHANNEL buttons move

forwards and backwards through Channels 1 to Channel 8, System and

Output A+B channels. The FUNCTION buttons move up or down through the

available functions for each channel.

Changing Values.

To change the values of each function, simply turn the Rotary Control to

display the desired value.

Page 10

Explanation of Functions

Output A+B Functions:

Output ChA and ChB Gain. Linked control of the output channels A and B

nominal gain.

When the >Function button is pressed the ChA gain flashes to indicate

independent setting of the output channel A nominal output gain.

When the >Function button is pressed again the ChB gain flashes to indicate

independent setting of the output channel B nominal output gain.

When the >Function button is pressed again the Channel A source flashes

to indicate which common bus the local output A should use as its source.

This can be set for Off, Bus X, Bus Y or Bus X and Bus Y

When the >Function button is pressed again the Channel B source flashes

to indicate which common bus the local output B should use as its source.

This can be set for Off, Bus X, Bus Y or Bus X and Bus Y

Functions of Channels 1 – 8:

Mono/Stereo

The MR88 can be set so that Channels 1 & 2, 3 & 4, 5 & 6, or 7 & 8 are

considered as a stereo pair. This reduces the number or setups required for

a stereo music source. Each stereo pair has only one setting for Input Level,

compression, EQ, Output, priority, gate attenuation, detector and hold time.

Gain adjustments for the Left and Right Channels can be linked or

independently set.

Line/Mic/Phantom

This sets the nominal input level to mic level + 48V phantom power, mic level

without phantom power or line level.

Gain Control - Pre-Amplifier

The MR88 has a substantial gain range, (-40 to +20dB) allowing the use of a

variety of microphones and line inputs. Generally, if the level has been set to

the correct type in the previous menu, only small changes should be

necessary. The LED meter displays the individual selected input channel

level, and the headphone monitor can be used to listen to the channel, so

that the gain can be set per channel, even when the channel is not

connected to the output. When set to stereo three functions allow the gain

adjustments for the Left and Right Channels to be linked or independently

set.

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