AM 81 Automatic Microphone Mixer Operation and Installation Manual version 2.0 www.clockaudio.
Contents: Introduction ----------------------------------------------- 03 Product Overview --------------------------------- 04~05 1 Features 2 Front Panel Layout 3 Rear Panel Layout 4 LCD Panel and Controls 5 Dimensions Connecting your AM 81 ------------------------------- 06 1 Power 2 Microphone Inputs 3 Master Output 4 Pre-Amplifier Outputs 5 External Control Function 6 Expansion Options Installation and Set-Up --------------------------------- 07 1 Priority Channel Configuration 2 Priority State 3 Reset
Introduction: Clockaudio AM 81 is an 8 channel automatic microphone mixer ideal for multi channel microphone systems in conference and voice reinforcement applications. By automatically sensing when a channel becomes active the AM 81 will simply control the level of the system dependant on the priority settings, the NOMA (number of open microphones Attenuated) function will also control and adjust the mixer output to prevent feedback due to open microphone channels.
Product Overview: 1 Features • • • • • • • • • • 8 x Microphone Inputs 1 x Aux/Music Input Individual Priority settings Main Output (Balanced) 8 x Individual Pre-Amp Outputs Simple LCD Display (to view and change settings and functions) Automatic or Manual operation. NOMA facility (number of open microphones Attenuated) Link In /Link Out for multi system use. Free Standing Case supplied with optional 1U 19” Rack Mount Kit as standard. 2 Front Panel Layout See Drawing and numbered features.
4 LCD Panel and Controls Individual functions and mixer set up is achieved using a simple LCD display and 4 button control panel (Enter, Up, Down and Escape) Start Up Screen: shows model number. Enter: to execute the screen menu function and open the configuration screen. ESC: to quit the current location and return to the previous menu. Up/Down: to move through the menu structure. Note: whilst in the menu function the back light will automatically turn off if a button is not pressed for approx.
Connecting your AM 81 1 Power 5 External Control Function The mains power is connected via the fused IEC connector on the rear panel, power source should be 220vAC~50Hz. This remote control feature is provided via a 15pin D Type connector. 2 Microphone Inputs Microphone Inputs: The 8x Microphone Inputs are provided via 3pin XLR-Female type connectors.
Installation and Set-Up 1 Priority Channel Configuration 2 Priority “State” Microphones allocated as Priority can gain access at any time, normally the priority microphone is used by the Chair Person of a conference for example to override the other microphones on the system. It is possible to show the priority status via the LCD panel display. Press the Enter button to enter the configuration screen. 1.SetMic 2.State From the menu using the Up/Down buttons select 2.State. 1.SetMic 2.
Detailed Settings See printed details on inside of AM 81 lid for location of switch and potentiometer locations 1 Switching for Pre-Amplifier Output Each output may be configured to operate before or behind the gate, this is programmed via switches on the main PCB as follows: Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 Ch8 SW8 SW10 SW12 SW14 SW16 SW18 SW20 SW22 2 Gate Attenuation Adjustment Attenuation of each of the individual Pre Amplifier outputs is adjusted via a series of potentiometers as follows: C
7 NOMA Settings To enable or disable the NOMA function of the mixer please use SW6 located on the main PCB. If using the AM 81 in a larger multi mixer configuration it is recommended that the NOMA facility is switched off and any adjustments to gain levels should be made manually. 8 NOMA Level Adjustment The NOMA levels are preset at the factory, it is not recommended to make any adjustment to this facility as this can dramatically affect the performance of the mixer.
Final Checklist Once all individual settings and configurations have been made to the internal control of the AM 81 it is recommended the following procedure is followed when connecting and commissioning the system, it may be an idea to have someone to assist you when carrying out this procedure. 1 Turn down the gain levels of the amplifier or host equipment or disconnect the mixer unit from the amplifier or host equipment.
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