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COMBINATIONS WITH THE M-25

 

MULTIPLE AMPLIFIER SYSTEM

 

Fig. 3 shows a configuration based on two stereo 

power amplifiers which are used to drive a pre-

amplifier, crossover network and four special 

speaker systems, all of which are separate buys. 

The main advantage of the multiple amplifier 

system is that it reduces the intermodulation 

distortion. It does this by dividing the audible 

frequency range and amplifying each of the sepa-

rate frequencies with special stereo amplifiers. The 

audible frequency range can be split into two or 

three, in which case the resulting systems are 

known as 2-way or 3-way multiple amplifier 

systems.

 

MAINTENANCE

 

Wipe off any dirt or dust that accumulates on the 

operating panel or casing with a polishing cloth or 

dry, soft cloth. Clear out any dust between the fins 

of the radiator with a brush or similar object. Do 

not use furniture wax or cleaners. Remember also 

to avoid using thinners, benzine, alcohol and any 

other volatile chemicals since they will corrode the 

panels.

 

 

ATTACHING THE NAME PLATE

 

The M-25's name plate is designed so that it can 

be attached to face you, whichever direction the 

M-25 is pointing. All you have to do is to turn the 

M-25 upside down, and remove the screw fastening 

the name plate with a Phillips screwdriver. Then, 

attach the plate to that side which you want to 

face you. Always remember that the M-25 is a 

heavy piece of equipment and so it should be 

handled with the greatest of care. Spread some-

thing under it when turning it upside down to 

prevent it from being marked.

 

Summary of Contents for M-25

Page 1: ...Maintenance 6 Characteristics Charts 7 Specifications 8 IMPORTANT NOTICE The serial number for this equipment is located on the bottom plate Please write this serial number on your enclosed warranty card and keep in a secure area This is for your security WARNING TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE ...

Page 2: ...excellent regulation but also have plenty of reserve Along with the wide band frequency response they ensure a superior channel separa tion and a reproduction of sound which is both clear and full of latent energy There is also a surge killer circuit to keep the inrush current from the power transformers as well as the high current which charges the electrolytic capacitors to the bare minimum and ...

Page 3: ......

Page 4: ...speaker to the M 25 s L speaker output terminals Both speakers are clearly marked with plus and minus polarities red and white respectively The M 25 s speaker output terminals are similarly marked Make sure that you connect like poles plus to plus minus to minus PREAMPLIFIER As shown in Fig 2 use the accessory connecting cords to connect the stereo preamplifier s output terminals to the M 25 s inp...

Page 5: ...er PROTECTIVE CIRCUITRY There will be no sound from the speakers for between three and eight seconds after the M 25 s power switch has been thrown This is because the supply of power actuates the muting circuit which is designed to eliminate noise when this switch is thrown In addition the protective circuitry is actuated to safeguard the speakers from being damaged in the rare case that DC compon...

Page 6: ...st that accumulates on the operating panel or casing with a polishing cloth or dry soft cloth Clear out any dust between the fins of the radiator with a brush or similar object Do not use furniture wax or cleaners Remember also to avoid using thinners benzine alcohol and any other volatile chemicals since they will corrode the panels ATTACHING THE NAME PLATE The M 25 s name plate is designed so th...

Page 7: ......

Page 8: ...put No more than 0 008 Intermodulation Distortion 50 Hertz 7 000 Hertz 4 1 Continuous rated power output No more than 0 006 60 watts per channel power output No more than 0 005 1 watt per channel power output No more than 0 005 Frequency Response 5 Hertz to 200 000 Hertz 0 1dB Input Sensitivity Impedance 1V 50 kilohms Output Speaker 4 ohms to 16 ohms Damping Factor 5 Hertz to 30 000 Hertz 8 ohms 6...

Page 9: ......

Page 10: ...Intermodulation Distortion No more than 0 006 50Hz 7 000Hz 4 1 continuous rated power output No more than 0 005 60 watts per channel power output No more than 0 005 1 watt per channel power output Frequency Response 5 to 20 000Hz 0dB 1 0dB Input Sensitivity Impedance 1V 50k ohms Output Speaker 4 ohms to 16 ohms Damping Factor 60 5 to 30 000Hz 8 ohms Hum and Noise 120dB IHF short circuited A networ...

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