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Summary of Contents for Clockaudio MR88
- Page 1 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...
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Page 2: Table Of Contents
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 ....................... -
Page 3: Introduction
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. -
Page 4: Features
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. •... -
Page 5: Mr88 Front Panel
MR88 Front Panel Controls Output Level +6 O/L CLOCKAUDIO Channel Selected Channel MR88 Function Monitor Power 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. -
Page 6: Mr88 Rear Panel
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. -
Page 7: Mr88 Menu Functions
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... -
Page 8: Menu System
Menu System Output Ch 1 Ch 2 Ch 1 + 2 System Gain Ch A+B Input Type Input Type Input Type Priority 1 mode -60dB – 0dB Mono/Stereo Mono/Stereo Stereo/Mono Inclusive/ Exclusive Gain Ch A Input Level Input Level Input Level Priority 2 mode -60dB –... -
Page 9: Changing Channels And Functions
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. -
Page 10: Explanation Of Functions
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. -
Page 11: Compression
The task of the compressor is to reduce the dynamic range of the input signal and to control the overall level. The MR88 has a compressor on each of the inputs that can be set to Off, 1 – 8 and Max. These settings vary from 1:1 to 6:1. -
Page 12: Detector - Adjustable Detector Control
The NOMA system helps reduce feedback, by allowing for the increase in system gain, as the number of open microphones increases. When selected, the MR88 identifies exactly how many NOMA selected microphones are on, and automatically adjusts the gain. However, NOMA will reduce the sound level of each individual person speaking, which may not be desired, especially in applications such as conferencing. -
Page 13: System Functions
System Functions: Priority There are 4 levels of priority for the channels. Each priority can be assigned one of two modes: Priority 1 is the lowest, priority 4 the highest. Channels of a higher priority will lock out channels of a lower priority. •... -
Page 14: Active Control Outputs
+50V DC. This allows a variety of external devices to be driven from the mixer. For extra flexibility the MR88 can be set so that these outputs are either HIGH or LOW when the channel is active. - Page 15 3. Relays can be wired as follows:- Control Out 1 Control Out 2 Control Out 3 Control Out 4 Control Out 5 Control Out 6 Control Out 7 Control Out 8 Control In 8 24V Relay Control In 7 Control In 6 Control In 5 Control In 4 Control In 3...
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Page 16: Control Inputs
Control Inputs Each channel has a force closure input to 0V. This menu sets the sense of the closure switch. Force Off means that a shorting switch would force a channel off. Force On means that a shorting switch would have to be closed to allow a channel to be active. Any channel can only become active if the detector and priority allow it to. -
Page 17: Vca - Control
VCA - Control Output Gain can be controlled by the external VCA’s connected to the External Control Port. External potentiometers of 10k linear are required. These will provide 0 to 60 dB of attenuation from the output gain setting in the Output Gain menu. -
Page 18: External Control Port
External Control Port Pin Number Function Control Out 1 Control Out 3 Control Out 5 Control Out 7 Control In 8 Control In 6 Control In 4 Control In 2 Gnd (Chassis) +5V Output ( 100mA Max ) VCA 1 Wiper VCA 2 Top VCA 2 Gnd (Chassis) Control Out 2... -
Page 19: Link In/Out - Daisy Chain Capability
Priority and control extends throughout the entire chain. The practical limit of the number of MR88 mixers that can be daisy chained is 50. The SYSTEM settings for Priority and Last One On should be set to be the same for all mixers in the chain. -
Page 20: Installation
Installation 1. If rack mounting, fit the mixer to the rack before commencing with the rest of the set-up. 2. Connect 15 V DC power supply provided to the 2.1mm DC connector on the rear panel. 3. Turn the mixer on using the Power switch on the front panel. Basic Set-up for Microphones 1. -
Page 21: Security Mode
How to Unlock the Mixer: When the mixer is locked it will either display "Locked, Enter Code ----", or "Clockaudio MR88". To unlock the front panel controls, press either the CHANNEL or FUNCTION buttons. Enter the correct code using the rotary control and Function Buttons and press either the CHANNEL or FUNCTION buttons to unlock the mixer. -
Page 22: Specifications
Specifications Input Impedance 2.4kΩ Differential Output Impedance Balanced 50Ω Pre-Amp Out 560Ω Max Input Level Mic Level -23 dBV Line Level +16 dBV Max Output Level +19 dBV Nominal Output Level at 0 dB on Meter Pre-amp Out -10 dBV Balanced -60 dBV to +4 dBV (Level set on front panel) Frequency Response...
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