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Important safety instructions

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

!

PRELIMINAR

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CAUTION: To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside.
Refer servicing to qualified service personnel.

SAFEGUARDS: Electrical energy can perform many useful functions. This unit has been engineered and
manufactured to assure your personal safety. Improper use can result in potential electrical shock or fire
hazards. In order not to defeat the safeguards, observe the following instructions for its installation, use and
servicing.

NOTES: This equipment has been tested and found to comply by Competent Body (Directive 89/336/EEC-
EMC) pursuant to the product family standard for audio professional use:
EN 55103-1 and EN 55103-2 standard ); EN61000- 3 - 2, EN 61000 - 3 - 3.

This is a Class A product. In a domestic environment this product my cause radio interferences in which case
the user may be required to take adequate measures.

KEEP THIS INSTRUCTIONS

Location

Precautions regarding installation:

WARNING:

I

nstall the amplifier in a well-ventilated location where it will not be exposed to high temperature or humidity.

Do not install the amplifier in a location that is exposed to direct rays of the sun, or near to hot appliances or radiators.
Excessive heat can adversely affect the cabinet and internal components. Installation of the amplifier in a damp or
dusty environment may result in malfunction or accident.

Placing and using the amplifier for long periods on heat-generation sources will affect performances. Avoid placing the
amplifier on heat-generating sources. Install this amplifier as far as possible from tuners and TV sets. An amplifier
installed in close proximity to such equipment may cause noise or degradation of the picture.

To prevent fire or electric shock

do not expose this equipment to rain or moisture.

Apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall
be placed on the apparatus”.

!

The ventilation openings must not be impeded by any items as newspapers, table-clothes, curtains etc; keep
a distance of at least 50cm from the front and rear ventilation openings of the amplifier.

!

!

Warning notices

Summary of Contents for L SERIES

Page 1: ...L E Digital Audio Amplifier for Professional Applications User Manual V 1 1 27 4 2005...

Page 2: ......

Page 3: ...1 E P R E L I M I N A R Y Table of contents This page left intentionally blank...

Page 4: ...s regarding installation WARNING Install the amplifier in a well ventilated location where it will not be exposed to high temperature or humidity Do not install the amplifier in a location that is exp...

Page 5: ...are capable of producing much more power than many loudspeakers can handle It is the user s responsibility to use suitable speakers with the amplifier and to use them in a sensible way that will not c...

Page 6: ...ce standard music has an average power density of 40 of the maximum level conventional amplifiers can easily generate 10 times more heat than DIGAM for the same volume of sound Crystal clear highs and...

Page 7: ...pletely tested and inspected before leaving the factory and should arrive in perfect condition If you find any damage notify the shipping company immediately Be sure to save the carton and all packing...

Page 8: ...ard 19 rack Four front panel mounting holes are provided Your DIGAM amplifier uses a forced air cooling system to maintain a low even operating temperature Drawn by an internal fan air enters through...

Page 9: ...ton then reset the cover and plug the mains cable figure 1 5 1 1 6 Building and setting DSP module s Warning before removing the cover turn off the power switch and unplug the mains cable The Digam L...

Page 10: ...below first open the fingers then rotate the module in the vertical position and extract it figure 1 6 6 figure 1 6 7 8 note if you mount 2 DSP module you must connect the J6 contact and J7 contact a...

Page 11: ...4 ON 1 ON 2 3 4 ON 1 ON 2 3 4 ON 1 SW103 ON 2 3 4 ON 1 ON 2 3 4 ON 1 CH3 4 CH1 2 LQ ONLY SET SW102 AS NEEDED FOR DSP INSTALLED OR NOT SW302 SW103 ON 2 3 4 ON 1 5 6 7 8 CN303 CN403 AS SPARE OUTPUTS CH...

Page 12: ...o other amps IN IN GND Balanced input IN SHIELD Unbalanced input figure 1 7 2 IN IN GND In the LD model two channels the input connections are in the right side of the panel the remaining input connec...

Page 13: ...polarity mode By having channel A and B operating in opposite polarity the energy storage in the power supply is more efficient This is significant for signals below 100Hz sub bass etc and improves t...

Page 14: ...ple of channels The clip LED when lighting indicates the clipping state for the output stage of the correspondig channel The signal 18dB and 6dB LEDs operate as V meter and the signal LED is lighted w...

Page 15: ...tomatically unmute but the LED will be unlighted at 75 C It will be possible to reduce the temperature reducing the output power 3 4 DC fault protection If DC or excessive subsonic energy appears at a...

Page 16: ...ronment the front side filters clog with dust after prolonged use this will interfere with cooling You may use compressed air to remove the dust from filters To remove air filters see fig 4 3 1 unscre...

Page 17: ...our amplifier is defective check your system configuration and amplifier settings to determine the origin of the problem In many cases incorrect audio interfacing poor cabling or other system level im...

Page 18: ...DGMCONTROL DIFFERENTIAL AMPLIFIER OUTPUT SIGNAL LFRONT VOLUME CONTROL DISPLAY DGMDSPA OPTIONAL DSP BOARD DGMCONTROL LIMITER CIRCUIT DGMCONTROL ERROR AMPLIFIER DGMCONTROL CLOCK GENERATOR AND DIVIDER DG...

Page 19: ...1 1 2 2 bridge Power Watts EIAJ per channel Single ch all ch s driven LED bars indicators Over temperature forecasting Thermal protection Short circuit protection Over load output protection Temperat...

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