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1 Introduction

Powersoft is a leading company in the field of high efficiency audio power management. The totally new Powersoft's
DIGAM (DIGital AMplifier) technology has changed the way the world looks at professional audio amplification. No
other amplifiers come close for applications demanding high power and long term reliability. Thanks to amazing
reductions in heat output along with reductions in weight and the specific high output power, DIGAM amplifiers can be
used in an unlimited range of applications such as concert touring, opera houses, theatres, churches, cinema, theme
parks, television sound stages and industrial applications.

PRELIMINAR

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More sound and less weight

Totally Digital with High Reliability

Compared to a conventional amplifier, Powersoft DIGAM technology offers very high efficiency and delivers more
power to the loudspeakers with much reduced heat dissipation. This greater efficiency enables dimensions, weight and
power consumption to be reduced. The output stages of the amplifiers typically run at 95% efficiency, dissipating only
5% of the input energy as heat.

One of the most interesting characteristics is that DIGAM's efficiency is almost independent of output level.
Conventional amplifiers achieve their best efficiency only at full rated power output. Since 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 a tight, well-defined low end: the most accurate reproduction of an audio signal. Patented
design features ensure very high performance in parameters such as distortion, frequency response, slew rate, power
bandwidth and dumping factor.

The DIGAM series is based on PWM technology that has been used for 30 years or more in power supplies and
inverters. PWM provides high reliability, small size, low weight and high efficiency. A PWM converter works as a high
frequency sampler, converting the variable amplitude (audio) signal into an impulse sequence with average value
equal to the audio input.
DIGAM amplifiers use very high sampling frequencies to obtain high performances across the audio band. Powersoft
holds several patents on the DIGAM technology.

DIGAM Series is completely protected against every possible error in operation and is designed to work under every
condition. It gives you maximum power with maximum safety and increases long-term reliability. Anticipating potential
problems at the design stage means your show always goes on!

Superior Sound-Sonic Accuracy

The Show Always Goes On

The L Series

The more important characteristics of the L series are the compact dimensions, the light weight and the ease of use.
Moreover for the L series amplifiers are upgradable with DSP and remote control.

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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