Meyer Sound M-5 User's Manual
Contents
1. Positive and Negative Front Panel Controls Connectors Inputs Outputs Balanced Sense Inputs Power Physical Dimensions Weight Meyer Sound Laboratories Inc 2832 San Pablo Avenue Berkeley CA 94702 Balanced ISO Input 10 KQ Active push pull will drive 600 Q 26 dBV 90 dBV A weighted gt 110 dB 10 KQ true differential 900 Hz RMS limiter 100 msec integration time peak and excursion limiters RMS limiter 100 msec integration time peak and excursion limiters Bi color LEDs Red LEDs Green LED Green LEDs Level control AC on off Safe AutoSafe switch XLR type A 3 Banana jacks 90 100V 105 120V 180 200V 210 240V AC rear switchable 19 Wx1Y H x 7Y D 8 Ibs 3 6 kg 05 025 002 01 A2. the field e Disconnect loudspeakers leaving the amplifier and the M 5 in their standard connection configuration lf your amplifier requires a load use resistive loads sufficient to dissipate the full power of the amplifier e Turn on both the M 5 and the amplifier e Set the Safe switch in Meyer Sound Laboratories Inc 2832 San Pablo Avenue Berkeley CA 94702 e Supply an input to the M 5 preferably a sine wave oscil lator If you do not have an oscillator use a microphone and a mixer to produce a line level signal e Set the input frequency according to this table Oscillator Microphone Lo limiter 200 Hz low growl Hi limiter 5 000 Hz loud whistle Bring up the input until you see the corresponding limit indicator come on Since in each case the indicator will light only if the limiter actually operates it provides a positive indication that the limiter is functioning M 5 Control Electronics Unit X Meyer M r Sound Operating Instructions Meyer Sound Laboratories Inc 2832 San Pablo Avenue Berkeley CA 94702 M 5 Control Electronics Unit MA Meyer Sound Operating Instructions Specifications Input Type Output Type Maximum Input Output Level Balanced Hum and Noise Dynamic range Sense Inputs Electronic Crossover Frequency Driver Protection Circuitry Low Frequency High Frequency Indicators Sense Hi and Lo Limit Hi Lo and VHF Safe Power Supply
3. M 5 Control Electronics Unit The Meyer Sound M 5 is an ac tive signal processor designed for use with the MSL 5 loud speaker It is a single channel device and it occupies a single 17 inch rack space The func tions of the M 5 are Active crossover for bi amplification Loudspeaker frequency response and phase response alignment e MultiSense driver protection Connections X Meyer i Sound Operating Instructions 1 Hi Amplifier Type 3 Amplifier with 16 dB fixed voltage gain Lo Amplifier Hi Sense Cable put Hi Output Type 3 Amplifier with 16 dB fixed voltage gain Out to MSL 5 Lo Sense Cable Diagram A Connections for use with MSL 5 The M 5 operates at line level and is designed to be the last component in the signal chain before the power amplifiers Connections to the M 5 should be made according to Diagram A 1 Signal Inputs to the M 5 should be balanced For the best signal to noise ratio the average input level should be at least 1 volt RMS The M 5 will accept peak inputs of up to 26 dBV Note The M 5 utilizes Meyer Sound s exclusive ISO Input Pins 1 2 and 3 are transformer isolated and the connector shell is connected to earth ground pin 3 positive for positive pressure out from the MSL 5 2 MultiSense connections are made from the outputs of the power amplifiers to the M 5 Sense inputs The output s of the High power amplifier s mu
4. ce the M 5 Attn control to set the system sensitiv ity If the system is not operating properly recheck all connections Note The Attn control markings are merely a visual aid and should not be used to balance two systems The output of the M 5 is calibrated only when the level control is fully clockwise Front Panel Controls The setup controls on the M 5 front panel are designed to be used to tailor the system response for particular applications Safe Autosafe Switch The M 5 incorporates three limiters in the MultiSense driver protection circuitry see detailed description below When the switch is in the Safe position the RMS limiters come on at 6 dB lower power levels affording added protection when heavy continuous power demands are placed on the system For operator convenience a green LED indicator is provided on the M 5 front panel which lights when the M 5 is in the Safe mode When the switch is in the Autosafe position the M 5 monitors system power over time and automatically switches into Safe mode if the power demands become too high In the case that Autosafe switches the M 5 into Safe mode the green LED will light to indicate the change Note It is recommended that the switch be in the Safe position until the operator is familiar with the system s capabilities MultiSense Driver Protection Through the Sense connections between the M 5 and the power amplifiers the MultiSense circuitry of
5. st be connected to the Hi Sense inputs and the output s of the Low power amplifier s to the Lo Sense inputs in order for the MultiSense driver protec tion circuitry to operate properly Note These inputs are polarity sensitive be certain that they are connected as indicated on the M 5 rear panel 3 The signal Outputs from the M 5 are active bal anced The maximum output level before clipping is 26 dBV 4 Connections between the power amplifier outputs and the MSL 5 loudspeaker should be made according to the MSL 5 Operating Instructions These connec tions must be verified for correct polarity and cor rect amplifier assignments high to high low to low Color codes given in the diagrams are those used for Meyer Sound cables and adapters Meyer Sound Laboratories Inc 2832 San Pablo Avenue Berkeley CA 94702 M 5 Control Electronics Unit Operation Operating Instructions Once all the connections have been made and verified the system is ready to operate Note Check the voltage selector switch located on the rear panel of the M 5 and verify that it is set to the range that corresponds to the mains AC voltage e The M 5 Attn control should be set at minimum Switch on AC to the M 5 first then to the power amplifiers e Verify that the power amplifier voltage gains are fixed at 16 dB 6 3 volts out for 1 volt in measured from bal anced input to speaker output terminals Advan
6. the M 5 continuously monitors the voltages across the high and low frequency drivers If the amplifier output exceeds the safe operating limits of the drivers inde pendent limiters are automatically activated holding down the level of the M 5 output Note The M 5 employs an excursion limiting system which assumes a fixed amplifier voltage gain of 16 dB 6 3 volts out for 1 volt in Please refer to the MSL 5 Operating Instructions or the Meyer Sound MSL 10A Power Amplifier Criteria note for a detailed description of MSL 5 M 5 amplifier requirements The operation of the MultiSense circuitry is indicated by a set of five LEDs located on the front panel e Sense indicators These function as signal presence indicators and verify that the Sense connections back to the M 5 are made These indicators will be lit green whenever signal is present or will flicker at low signal levels These indicators will also light red if there is a sense fault amplifier gain not set at 16 dB or sense lines improperly or not connected Limit indicators These indicators will come on when ever the corresponding limiter is activated and a moder ate amount of flashing of these indicators is acceptable The Hi and Lo limiters have an attack time of 100 msec so they will not affect peaks in the program material nor will they prevent momentary amplifier clipping on peaks Limiter Operation MA Meyer Sound To verify limiter operation in
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