DIGAM L SERIES Bedienungsanleitung
L
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Digital Audio Amplifier
for Professional Applications
User Manual
V 1.1 (27/4/2005)
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PRELIMINARY
Table of contents
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Important safety instructions
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN !
PRELIMINARY
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:
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 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
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Safety rules
This device must be powered exclusively by earth connected mains sockets in electrical networks compliant to the IEC
364 or similar rules.
Is absolutely necessary to verify this fundamental requirement of safety and, in case of doubt, require an accurate
check by a qualified personnel.
The constructor cannot be considered responsible for eventual damages caused to persons, things or data for the
missing of accurate earth link.
Before powering this device verify that the amplifier is supplied with the correct voltage rating.
Verify that your mains connection is capable to satisfy the power ratings of the device.
Do not spill water or other liquids into or on the unit.
Do not use this unit if the electrical power cord is frayed or broken.
Do not remove the cover. Removing the cover will expose you to potentially dangerous voltage.
No naked flame sources such like lighted candles should be placed on the amplifier
!
!
!
!
!
!
!Provide sectioning breaker between mains connections and apparatus. Suggested device is 10A/250Vac
(230Vac mains voltage) or 16A/250Vac (110Vac mains voltage), C or D curve, 10KA.
Speaker damage
The DIGAM series amplifiers are among the most powerful professional amplifiers available and 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 cause damage.
Powersoft will not be responsible for damaged speakers. Consult the speaker manufacturer for power-handling
recommendations.
Even if you reduce the gain using the amplifier's front panel attenuation controls, it is still possible to reach full output
power if the input signal level is high enough.
A single high-power crescendo can damage high-frequency drivers almost instantaneously, while low-frequency
drivers can usually withstand very high, continuous power levels for a few seconds before they fail. Reduce power
immediately if you hear any speaker "bottoming out" - harsh pops or cracking distortion that indicate that the speaker
voice coil or diaphragm is striking the magnet assembly.
Powersoft recommends that you use amplifiers of this power range for more headroom (cleaner sound) rather than for
increased volume.
Speaker output shock hazard
A DIGAM amplifier is capable of producing hazardous output voltages. To avoid electrical shock, do not touch any
exposed speaker wiring while the amplifier is operating.
This manual contains important information on operating your DIGAM amplifier correctly
and safely. Please read it carefully before operating your amplifier. If you have any
questions, contact your Powersoft dealer.
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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.
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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.
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1 Installation and operation
1.1 Unpacking
Carefully open the shipping carton and check for any noticeable damage; t
Every Powersoft amplifier is completely 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
materials for the carrier's inspection.
he figure below shows the view of the packing.
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figure 1.1
mains cable
this manual
amplifier
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PRELIMINARY
1.3 Operating Precautions
Make sure the AC mains voltage is correct and is the same as that printed on the cover of the amplifier. Damage
caused by connecting the amplifier to improper AC voltage is not covered by the warranty. Make sure the power switch
is off before making any input or output connections.
It is always a good idea to have the gain controls muted during power-up to prevent speaker damage if there is a high
signal level at the inputs.
Whether you buy them or make them, use good-quality input and speaker cables. Most intermittent problems are
caused by faulty cables. Use good-quality connectors and wire, along with good soldering technique, to ensure
troublefree reliability.
1.4 AC Mains connection
Warning: before connect the mains be sure that the amplifier is set up to the correct mains voltage.
It s important to connect the ground for safety, do not use adapters that disable the ground.
The AC Mains connection is made via the IEC type connector on the rear side of the panel. The figure below shows
the connection to the amplifier. Be sure that your AC mains power source has the requirements indicated in
this manual. i
figure 1.4.1
1.2 Mounting
All DIGAM amplifiers will mount in a standard 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 the slots in the front panel and courses over and through components. The DIGAM series amplifiers
feature an "intelligent" variable-speed DC fan which is controlled by heat sink temperature sensing circuits: the fan
speed will increase only when the temperature of the heat sink requires it, which keeps fan noise to a minimum and
helps cut dust accumulation inside. Under extreme thermal load, the fan will force a very large volume of air through
the heat sink. If the heat sink gets too hot, its sensing circuit will reduce the output power. If the amplifier overheats,
another sensing circuit shuts down its circuit to cut off power until it cools to a safe temperature.
The exhaust cooling air is forced out through the rear of the chassis (see figure 1.2.1), so make sure there is enough
space around the sides of the amplifier to allow the air to escape. If it is rack mounted, make sure the exhaust air can
flow without resistance. If you are using a rack with closed backs, there must be at least one standard rack space of
opening in the front of the rack for every four amplifiers. Amplifiers may be stacked directly on top of each other (no
space needed between units), starting from the bottom of the rack.
figure 1.2.1
air flow
MAINS
GROUND
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230V
115V
1.5 Mains voltage setup
Warning: before removing the cover, turn off the power switch; unplug the mains cable and wait for 10 minutes.
The Digam L series accepts 115V or 230V mains voltage. To set up the correct voltage unscrew the screws on the top and
on the lateral side of the unit and remove the cover and plug the small cable showed in the figure 1.5.1 to the correct male
faston; 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 series has otional DSP modules for additional sound effects. To mount or unmount theDSP modules remove
the cover; you can mount this modules on the 72-pin SIMM sockets as showed in the figure below.
DSP socket for CH1 and CH2 channel
DSP socket for CH3 and CH4 channel (only for LQ model)
DSP modules
SW302 DIP SWITCH
(only for LQ model)
SW103 DIP SWITCH
(only for LD model)
SW102 DIP SWITCH
SW104 DIP SWITCH
figure 1.6.1
1.6.1 Mounting DSP module(s)
The correct operations for mounting a DSP module is shown in the figures below; the first operation is to insert the module
vertically with the component side shown in the figure 1.6.2 in the caveat of the SIMM socket with a weak pressure, then
rotate the module until the fingers have jammed it (figure 1.6.3).
figure 1.6.2 figure 1.6.3
1.6.2 Removing DSP module(s)
The correct operations for mounting a DSP module is shown in the figures 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 at the rear side of the
correspondent DSP module (see the figure1.6.4); the figure 1.6.5 shows the exact point where you must solder
the wire. This operation is necessary to syncronize the channels 1-2 with the channels 3,4 sampling clock if the
DSP board is a version up to DGMDSPA13; from version 14 there is no need of external sync for the DSP
boards
figure 1.6.4 figure 1.6.5
DSP module for channel 1-2
wire
DSP module for channel 3-4
J6 contact
wire
J7 contact
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