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9

OUTPUTS 
 
The  speaker  outputs  are  via  4mm  shrouded  binding  posts.  They  can  be  used  with  4mm  plugs  or  plain 
wires, which can be inserted in the sides of the terminals. 
  
Terminations are as follows:-  Hot   

 Red 

 

 

 

 

 

 

 

 

 

Cold   

 Black 

 

NOTE

:  1.  Although the "cold" output terminals are nominally at 0V, they should not be joined  

 

 

 

 

together, otherwise cross-talk may be introduced. 

 

2.

 

The currents involved are very high, especially when using 2 ohm. loads. The speaker  

 

 

 

 

cables should be capable of carrying the currents, otherwise the losses will cause the  

 

 

 

 

cables to get hot and audio power will be reduced. The minimum rating for an MC750 

 

 

 

 

should be 15 amps for 4 ohm and 20 amps for 2 ohm loads.  

 

NOTE

:  Do not connect the inputs/outputs to any other voltage source such as a battery, mains  

 

 

 

source or power supply, regardless of whether the amplifier is turned on or off. 

 
 

 

 

Do not run the output of any amplifier channel back into another channel’s input and  

 

 

 

do not parallel or series-connect an amplifier output with any other amplifier output. 

 

BRIDGED (MONO) OPERATION 

 
Connect as follows :  HOT 

-   

Channel A Hot   

 

 

 

 

 

 

 

 

COLD  -   

Channel B Hot   

 
Leave both COLD connections open circuit, they are internally joined. 
 

             NOTE

:  The load impedances change when operating in the bridged mode. (See Load/Power section  

 

 

 

below.) 

 
LOAD/POWER SWITCH   2 ohm/4 ohm 
 
In  the  4  ohm  position,  the  amplifier  supply  voltages  are  set  up  for  loads  of  4  ohms  and  above.  Lower 
impedance loads can be connected but the internal current limit circuit could cause clipping, and unless 
the signal is very dynamic, the internal temperature rise will automatically reduce the supply voltages and 
set  the  amplifier  to  the  2  ohm  position.  In  the  2  ohm  position,  the  supply  voltages  are  reduced  and  the 
level (overload) indicators and limiters are re-referenced accordingly. 
 

When operating in bridged mode, the minimum impedances are doubled, i.e. for 4 ohm loads use 
the 2 ohm position and for 8 ohm loads use the 4 ohm position. The minimum load in bridged mode 
is 4 ohms. 

 

OPERATION 

 
Read  all  documentation  before  operating  your  equipment  and  retain  all  documentation  for  future 
reference. 
 
Do not spill water or other liquids into or on the unit and do not operate the unit while standing in liquid. 
 
Do  not  block  fan  intake  or  rear  ventilation  outlets  or  operate  the  unit  in  an  environment  which  could 
impede the free flow of air around the unit. 
 
If  the  unit  is  used  in  an  extremely  dusty  or  smoky  environment,  it  should  be  cleaned  of  any  collected 
debris at regular intervals. (See Maintenance section.) 

Содержание MC1250

Страница 1: ...MC750 OPERATING INSTRUCTIONS MC 2 AUDIO Ltd Units 6 8 Kingsgate Heathpark Industrial Estate HONITON Devon EX14 1YG England Tel 0 1404 44633 Fax 0 1404 44660 www mc2 audio co uk ...

Страница 2: ...S Inputs 8 Outputs 9 Rear panel switches 9 OPERATION Switching on 10 Level controls 10 Mute switches 10 Link switch 10 Level indicator 10 Limiters 10 Temperature control 11 Fault indicators 11 2 ohm LED 11 INTERNAL CONFIGURATION SWITCHES 12 REMOTE CONTROL OPTION 13 REMOTE CONTROL SET UP INSTRUCTIONS 14 ...

Страница 3: ...tional Specifications Input Impedance Active balanced k ohms 20 20 Input CMRR dB 60 60 Hum Noise dB below max output 106 106 Damping Factor 1kHz into 8 ohms 400 400 Signal Limiters set to prevent excessive clipping Yes Yes Protection Short circuit DC output Temperature Yes Yes Mains in rush control Yes Yes Output Power watts into 8 ohms Sine wave 1kHz 575 375 Continuous music with Crest Factor of ...

Страница 4: ...both on the apparatus and the packaging A product Declaration of Conformity statement and information regarding auxiliary apparatus and specifications required to meet conformity is available on request from our Customer Service Department on 44 0 1404 44633 This amplifier will only operate to its very high specification if it is installed and operated as described in this manual ...

Страница 5: ...d rating has been fitted Make sure power outlets conform to the power requirements listed on the back of the unit Damage caused by connecting to improper AC voltage is not covered by the warranty SAFETY WARNING This unit is fitted with a 3 wire power cord For safety reasons THE EARTH LEAD SHOULD NOT BE DISCONNECTED IN ANY CIRCUMSTANCE If ground loops are encountered consult the section on input co...

Страница 6: ...ave fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped 15 Do not expose this equipment to dripping or splashing and ensure that no objects filled with liquids such as vases are placed on the equipment 16 To completely disconnect this equipment from the AC mains disconnect the power cord from the mains circuit breaker 17 Where ...

Страница 7: ...l appareil l appareil a été exposé pour pleuvoir ou l humidité n opère pas normalement ou a été baissé 15 N exposez pas cet équipement au fait de tomber goutte à goutte ou au fait d éclabousser et garantissez qu aucun objet rempli des liquides comme les vases n est placé sur l équipement 16 Pour complètement débrancher cet équipement de la conduite principale de courant alternatif débranchez la co...

Страница 8: ...ONS INPUTS The inputs are made via 2 separate 3 pin XLR connectors wired in parallel Either socket can be used as the input the other one can be used to link to other amplifiers daisy chain or to the other input for mono signals They are electronically balanced and should be connected via a high grade twin core screened cable as follows PIN1 Screen see note PIN2 Hot signal PIN3 Cold signal The amp...

Страница 9: ...ly joined NOTE The load impedances change when operating in the bridged mode See Load Power section below LOAD POWER SWITCH 2 ohm 4 ohm In the 4 ohm position the amplifier supply voltages are set up for loads of 4 ohms and above Lower impedance loads can be connected but the internal current limit circuit could cause clipping and unless the signal is very dynamic the internal temperature rise will...

Страница 10: ...ich show the signal headroom before clipping The 0dB LED is set at approximately 1 2dB below clipping They are referenced to the supply voltages and automatically adjust when the supply changes When the level controls are adjusted the level indicators change function and show the level control position They return to their normal function after the level has been set Limiters The MC750 incorporate...

Страница 11: ...er to know this All other functions remain the same Normal dynamic signals will not cause the amplifier to overheat unless the air filter is clogged or the ventilation is inadequate See installation section Fault Indicators If the outputs are shorted or if DC is present the control circuit will disengage the outputs and the fault LED will illuminate The controller will keep monitoring the amplifie...

Страница 12: ...ttack time of the limiter ON Fast OFF Slow MAINTENANCE ENSURE THAT ELECTRICAL POWER TO THE UNIT IS DISCONNECTED BEFORE CARRYING OUT ANY MAINTENANCE The filter behind the air intake apertures on the front of the MC range amplifiers should be cleaned or replaced periodically e g 12 24 months Filters in amplifiers located in more dirty atmospheres may require more frequent maintenance The filter shou...

Страница 13: ...om the computer This allows the system to be set up to the client s requirements and then made secure against manual interference Two levels of security are available on the management control system through the use of passwords which permit a higher level access for the senior manager through one password and more limited access at a lower level to a number of other users Full Windows software is...

Страница 14: ...either end of the cable and connected as follows PIN 2 hot positive PIN 3 cold PIN 5 screen Configuring the PC 1 Launch Amplifier Explorer program can be downloaded from www mc2 mc2 audio co uk 2 Click on the Tools menu and select Serial link setup Then SET OPERATING SYSTEM e g WIN98 SET COM PORT NUMBER SET PORT ADDRESS This happens automatically Set up is now complete Each amplifier has its own i...

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