Clock Audio MR 88 User Manual
CLOCKAUDIO
MR88 Automatic Microphone Mixer
Version 4.2
Clockaudio Limited,22 Arnside Road
WATERLOOVILLE
Hampshire. UK
Tel : +44 (0)2392 251193 Fax : +44 (0)2392 251201
Email : sales@clockaudio
.co.uk
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 2
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 3
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 4
MR88 Front Panel
Power
Monitor
-201-10
O/L
Channel
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.
Output LevelControls
+6
Function
Selected Channel
2-63-3405+36 7 8
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 5
MR88 Rear Panel
CLOCKAUDIO
Made in EEC-UK
Link OutRS232
External Control Link In
A B
Outputs Input Channels
7 5 3 1
8 6 4 2
Pre-Amp Outputs 678 5 4 3 2 1
Input
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.
DC
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 6
MR88 Menu Functions
Navigation through the menu system is via the CHANNEL (
FUNCTION (
↔
) buttons. The table below illustrates the structure of the
↔
) and
menu.
Output Ch 1 Ch 2 Ch 3 Ch 4 Ch 5 Ch 6 Ch 7 Ch 8 System
Channel
A+B Gain
Channel
A Gain
Channel
B Gain
Channel
A Source
Channel
B Source
Compress Compress Compress Compress Compress Compress Compress Compress Control
Mono /
Stereo
MicPhant/
Mic/Line
MONO
Gain
STEREO
Gain L+R
STEREO
Gain Left
STEREO
Gain Right
Mono /
Stereo
MicPhant/
Mic/Line
MONO
Gain
STEREO
Gain L+R
STEREO
Gain Left
STEREO
Gain Right
Mono /
Stereo
MicPhant/
Mic/Line
MONO
Gain
STEREO
Gain L+R
STEREO
Gain Left
STEREO
Gain Right
Mono /
Stereo
MicPhant/
Mic/Line
MONO
Gain
STEREO
Gain L+R
STEREO
Gain Left
STEREO
Gain Right
Mono /
Stereo
MicPhant/
Mic/Line
MONO
Gain
STEREO
Gain L+R
STEREO
Gain Left
STEREO
Gain Right
Mono /
Stereo
MicPhant/
Mic/Line
MONO
Gain
STEREO
Gain L+R
STEREO
Gain Left
STEREO
Gain Right
Mono /
Stereo
MicPhant/
Mic/Line
MONO
Gain
STEREO
Gain L+R
STEREO
Gain Left
STEREO
Gain Right
Mono /
Stereo
MicPhant/
Mic/Line
MONO
Gain
STEREO
Gain L+R
STEREO
Gain Left
STEREO
Gain Right
Priority 1
mode
Priority 2
mode
Priority 3
mode
Priority 4
mode
Last One
on
Code
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
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
Hold time Hold time Hold time Hold time Hold time Hold time Hold time Hold time
NOMA NOMA NOMA NOMA NOMA NOMA NOMA NOMA
Manual
Detect
Level
Manual
Detect
Level
Manual
Detect
Level
Manual
Detect
Level
Manual
Detect
Level
Manual
Detect
Level
Manual
Detect
Level
VCA
Page 7
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