Dynacord DSA 8805, DSA 8410, DSA 8405 User Manual
OWNER’S MANUAL
BEDIENUNGSANLEITUNG
DIGITAL SYSTEM AMPLIFIER
CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Scope of Delivery and Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Responsibility of the User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Controls, Indicators and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mains Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Selecting the Mode Of Operation (MODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Selecting the Mode of Output (OUTPUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Variable Load Drive (VLD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power on delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Audio Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Standby Mode (POWER REMOTE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
RCM-810 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
INHALT
Einführung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Auspacken und Überprüfen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Lieferumfang und Garantie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Verantwortung des Betreibers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Bedienelemente, Anzeigen und Anschlüsse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Betriebsspannung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Netzschalter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Einbau . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Kühlung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Wahl der Betriebsart (MODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Wahl des Ausgangs-Modus (OUTPUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Variable Load Drive (VLD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Einschaltverzögerung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Audio Verkabelung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Betrieb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Eingangspegel-Regler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Anzeigen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Standby-Modus (POWER REMOTE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Optionen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
RCM-810 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Specifications/Technische Daten . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
DSA 8405 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
DSA 8410 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
DSA 8805 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Mains Operation & Resulting Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Block Diagram / Blockschaltbild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Dimensions / Abmessungen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2
IMPORTANT SAFETY INSTRUCTIONS
The lightning flash with arrowhead symbol, within an
equilateral triangle is intended to alert the user to the
presence of uninsulated „dangerous voltage“ within the
product’s enclosure that may be of sufficent magnitude
to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintance (servicing) instructions in the
literature accompanying the appliance.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not cover any ventilation openings. Install in accordance with the manufacture’s instructions.
8. Do not install near heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or the grounding-type plug. A polarized plug has two blades with one wider than the other.
A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. I t h e
provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from
the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for a long period of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as powersupply cord or plug is damaged, liquid has been spilled or orbjects have 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 supply cord plug from the AC receptacle.
17. The mains plug of the power supply cord shall remain readily operable.
IMPORTANT SERVICE INSTRUCTIONS
CAUTION: These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock, do not
perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so.
Refer all servicing to qualified service personnel.
1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when servicing the appliance.
2. Use of a mains separator transformer is mandatory during maintenance while the appliance is opened, needs to be operated and is
connected to the mains.
3. Switch off the power before retrofitting any extensions, changing the mains voltage or the output voltage.
4. The minimum distance between parts carrying mains voltage and any accessible metal piece (metal enclosure), respectively between the
mains poles has to be 3 mm and needs to be minded at all times. The minimum distance between parts carrying mains voltage and any
switches or breakers that are not connected to the mains (secondary parts) has to be 6 mm and needs to be minded at all times.
5. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only permissible when using
original parts.
6. Altering the circuitry without prior consent or advice is not legitimate.
7. Any work security regulations that are applicable at the locations where the appliance is being serviced have to be strictly obeyed. This
applies also to any regulations about the work place itself.
8.
All instructions concerning the handling of MOS-circuits have to be observed
NOTE: SAFETY COMPONENT (MUST BE REPLACED BY ORIGINAL PART)
.
WEEE RECYCLING/DISPOSAL INSTRUCTIONS
The Wheelie Bin symbol found on the product or in the manual indicates that this product must not be disposed of with other waste. It is in our category the manufacturer’s responsibility to properly dispose of their
waste electrical and electronic equipment (WEEE) at the end of its life. Due to the differences in each EU
country’s management of WEEE, please contact your local distributor. We are committed to facilitate our own
electronic-waste-management-system, for the free of charge return of all EVI Audio GmbH products: Telex,
Dynacord, ElectroVoice, Midas Consoles, KlarkTeknik and RTS. Arrangements are made with the dealer
where you purchased the equipment from, for the returning of all unusable equipment at no cost, to the factory in Straubing, for environmental protective disposal.
Owner‘s Manual 3
DIGITAL SYSTEM AMPLIFIER
1 Introduction
Dynacord‘s new high efficiency DIGITAL SYSTEM AMPLIFIER series combine uncompromising audio performance with the
highest reliabilty.
1.1 Unpacking and Inspection
Carefully open the packaging and take out the power amplifier. Inspect the power amp’s enclosure for damages that might
have occured during transportation. Each amplifier is examined and tested in detail before leaving the manufacturing site to
ensure that it arrives in perfect condition at your place. Please inform the transport company immediately if the power amplifier
shows any damage. Being the addressee, you are the only person who can claim damages in transit. Keep the cardboard box
and all packaging materials for inspection by the transport company.
Keeping the cardboard box including all packing materials is also recommended, if the power amplifier shows no external
damages.
CAUTION:
Do not ship the power amp in any other than its original packaging.
When shipping the power amp, make sure to always use its original box and packaging materials. Packing the power amplifier
like it was packed by the manufacturer guarantees optimum protection from transport damage.
1.2 Scope of Delivery and Warranty
• 1 Power Amplifier
• 1 Owner‘s Manual (this document)
• 1 Mains Cord
• 1 (DSA 8405/8410) or 2 (DSA 8805) Output connectors, 8 pole
• 2 (DSA 8405/8410) or 4 (DSA 8805) Input connectors, 6 pole
• 1 Power Remote connector, 2 pole
• 1 Warranty Certificate with safety instructions
Keep the original invoice that states the purchase/delivery date together with the warranty certificate at a safe place.
1.3 Responsibility of the User
Speaker System Damage
DSA power amps provide extremely high power output that might be dangerous for human beings as well as for the
connected speaker systems. High output voltages can damage or even destroy the connected speaker systems, especially,
when the DSA amplifier is operated in bridged mode. Prior to connecting any loudspeakers, make sure to check the speaker
system’s specifications for continuous and peak power handling capacities. Even if amplification has been reduced through
lowering the input level controls on the amplifier’s front panel, it is still possible to achieve full power output with a sufficiently
high input signal.
Danger at the Loudspeaker/Power Outputs
DSA amplifiers are capable of producing dangerously high voltage output that is present at the output connectors. To protect
yourself from electric shock, do not touch any blank speaker cables during operation of the power amp.
WARNING:
The terminals marked with are hazardous live and the external wiring connected to these
terminals requires installation by an instructed person or the use of ready-made leads of
cords.
HF-Interference (FCC Information USA)
1. IMPORTANT: Do not modify this unit! Changes or modifications not expressly approved by the manufacturer could void the
user‘s authority, granted by the FCC, to operate the equipment.
2. NOTE:This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide reasonable protection agains harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee
4 Owner‘s Manual
DIGITAL SYSTEM AMPLIFIER
that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment and receiver
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected
• Consult the dealer or an experienced radio/TV technician for help
This is a Class A product. In a domestic environment this product may cause radio interferences in which case the user may be required to take adequate measures.
This Class A digital apparatus complies with Canadian ICES-003.
Cat appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
Owner‘s Manual 5
DIGITAL SYSTEM AMPLIFIER
2 Installation
2.1 Controls, Indicators and Connections
Front View
1 Level Indicators for each channel
2 Protection Indicator (PROT) for each channel
3 Muting Indicator (MUTE) for each channel
4 Power On/Off Indicator (POWER)
5 Standby Indicator (STANDBY)
6 Remote Amplifier Indicator (IRIS-Net)
7 Mains Switch
Rear View
1 Mains Input
2 POWER REMOTE connector (POWER REMOTE)
3 Power On Delay selection switch (ON DELAY)
4 Power Amps Outputs (CH 1...4 / 5...8, BRIDGED)
5 Power Amp Outputs Mode Switch (MODE) and Outputs Load Switch (OUTPUT)
6 Input Level Control (LEVEL) for each channel
7 Audio Inputs (INPUT) for each channel
8 Expansion Slot (e.g. Remote Control Module RCM-810)
9 Type Plate
6 Owner‘s Manual
DIGITAL SYSTEM AMPLIFIER
2.2 Operating Voltage
The power amplifier receives its power supply via the mains input. During installation, always separate the power amplifier
from the mains. Connect the power amplifier only to a mains network, which corresponds to the requirements indicated on the
type plate.
Device Voltage Frequency Power Consumption
DSA 8405 220-240 V AC / 120 V AC / 100 V AC 50-60 Hz 490 W
DSA 8405 220-240 V AC / 120 V AC / 100 V AC 50-60 Hz 840 W
DSA 8805 220-240 V AC / 120 V AC / 100 V AC 50-60 Hz 930 W
Table 2.1: Operating Voltage
Mains Operation and Resulting Temperature
The power drawn from the mains network is converted into output power to feed the connected loudspeaker systems and into
heat. The difference between power consumption and dispensed power is called power dissipation (Pd). The amount of heat
resulting from power dissipation might remain inside of a rack-shelf and needs to be diverted using appropriate measures.
The tables on page 36 allow the determination of power supply and cabling requirements. The tables are meant as auxiliary
means for calculating temperatures inside of a rack-shelf system/cabinet and the ventilation efforts necessary.
The column P
amount per hour. The following factors allow direct proportional calculation of the mains current I
supply voltages: 100 V = 2.3, 120 V = 1.9, 220 V = 1.05, 240 V = 0.97.
lists the leakage power in relation to different operational states. The column BTU/hr lists the dispensed heat
d
for different mains
mains
2.3 Mains Switch
The Mains Switch on the front panel separates the power amp from the mains. Turning
the Mains Switch to ON starts booting up the power amp. A soft start circuit compensates
mains inrush current peaks and thus prevents the automatic cutout of the mains from
reacting when switching on the power amplifier. Speaker system switch-on is delayed by
approximately 4 seconds, effectively suppressing any possible power-on noise, which
otherwise might be heard through the loudspeakers.
2.4 Mounting
DSA amplifiers have been designed for installation in a conventional 19-inch rack case. Attach the power amp with its frontal
rack mount ears using 4 screws and washers as shown in following illustration. Additionally securing the amplifier at the rear
becomes necessary, if the rack case in which the power amplifier has been installed will be transported. Failure to do so may
result in damage to the power amplifier as well as to the rack case. Attach the power amp as shown in the illustration using 4
case nuts and screws. RMK-15 brackets for securing the power amplifier are available as accessories.
2.5 Ventilation
As with all Dynacord power amps with fan cooling, the airflow direction is front-to-rear, obviously because there is more cold
air outside of the rack case than inside. The power amplifier remains cooler and dissipating the developing waste heat in a
specific direction gets easier. In general, setting up or mounting the power amplifier has to be done in a way that fresh air can
enter unhindered at the front and exhausted air can exit at the rear. When installing the power amp in a case or rack system,
attention should be paid to these details to provide sufficient ventilation. Allow for an air duct of at least 60 mm x 330 mm
between the rear panel of the power amplifier and the inner wall of the cabinet/rack case. Make sure that the duct reaches up
to the cabinet’s or the rack case’s top ventilation louvers. Leave room of at least 100 mm above the cabinet/rack case for
Owner‘s Manual 7
DIGITAL SYSTEM AMPLIFIER
ventilation. Since temperatures inside of the cabinet/rack case can easily rise
up to 40 °C during operation of the power amp, it is mandatory to bear in mind
the maximum allowable ambient temperature for all other appliances installed
in the same cabinet/rack case.
CAUTION:
Blocking/closing the power amp’s ventilation louvers is not permissible. Without sufficient
cooling/ventilation, the power amplifier may automatically enter protect mode. Keep ventilation louvers free from dust to ensure unhindered airflow.
Do not use the power amplifier near heat sources, like heater blowers, stoves or any other heat
radiating devices.
To ensure trouble-free operation, make certain that the maximum allowable ambient temperature of +40°C is not exceeded.
For fixed amplifier installations in a device control room that incorporates a central air-cooling system or air conditioners,
calculating the maximum heat emission may be necessary. Please also take notice of the information on page 7.
Fan Cooling
The power amplifier has two fans. The fans are temperature controlled, i.e. they are not running permanently but the running
speed of the fans is controlled continuously depending on the ambient temperature. That in return ensures very silent running
during idle state. The temperatures of the power amp‘s channels are registered and monitored separately.
2.6 Selecting the Mode Of Operation (MODE)
The MODE switch on the power amp‘s rear panel defines how the audio inputs handle the input signals. The amplifier types
DSA 8405 and DSA 8410 allow the configuration of audio inputs CH 1/CH 2 or CH 3/CH 4, the amplifier type DSA 8805
additionally allows configuration of audio CH 5/CH 6 or CH 7/CH 8.
In the following description of the modes DUAL, PARALLEL or BRIDGED the generic letters A and B are used for the two
audio inputs of a MODE switch (e.g. for switch CH 1/CH 2 input A corresponds to CH 1 and input B corresponds to CH 2).
DUAL
In DUAL mode, the two channels of the power amplifier work independent from each other. This mode of operation is being
used for all 2-channel applications, like stereo or Bi-Amp (active) operation. Using the input level controls on the power amp’s
rear panel allows independently adjusting the channels’ amplification.
8 Owner‘s Manual
Illustration 2.1: Audio signal applied to both input connectors in DUAL mode
DIGITAL SYSTEM AMPLIFIER
PARALLEL
In PARALLEL mode, the inputs of channel A and channel B are directly electrically linked. The audio signal has to be applied
to the input connectors of channel A. Using the input level controls to independently control the amplification of the two
channels is still possible because only the channels’ inputs are linked. PARALLEL operation is the mode of choice, whenever
the same input signal drives multiple power amp channels of a large system installation, e.g. when driving massive bass
arrays.
Illustration 2.2: Audio signal applied to input A connector in PARALLEL mode
CAUTION:
In PARALLEL mode, the input signal has to be fed to input channel A only.
BRIDGED
In BRIDGED mode both amp channels work in push-pull operation to provide doubled output voltage. The audio signal has to
be applied to the input connectors of channel A, amplification is set via input level control of channel A only. BRIDGED
operation is the mode of choice, whenever high power speakers are used.
Illustration 2.3: Audio signal applied to input A connector in BRIDGED mode
CAUTION:
In BRIDGED mode operation, it is not allowable for the load connected to fall below a value of
4 ohms. Extremely high voltages can be present at the output. The connected speaker systems
must be able to handle such voltages. Make sure to completely read and fully observe power
rating specifications of the speaker systems to be used and to check them against the output
power capacity of the power amp.
OUTPUT 2 Ω 4 Ω 70 V 100 V
DSA 8405 4 Ω 8 Ω 1000 W at 140 V (≈20 Ω) 1000 W at 200 V (≈40 Ω)
DSA 8410 4 Ω 8 Ω 2000 W at 140 V (≈10 Ω) 2000 W at 200 V (≈20 Ω)
DSA 8805 4 Ω 8 Ω 1000 W at 140 V (≈20 Ω) 1000 W at 200 V (≈40 Ω)
Table 2.2: Minimum load in BRIDGED mode
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DIGITAL SYSTEM AMPLIFIER
2.7 Selecting the Mode of Output (OUTPUT)
Different output modes are available for the amplifier‘s output channels. Each channel can be switched to high impedance
mode (HZ) for driving 70 V or 100 V loudspeakers without output transformers (Direct Drive).
In DUAL or PARALLEL mode each output channel‘s OUTPUT setting can be independently set. In BRIDGED mode for each
pair of outputs only the OUTPUT setting of the channel with odd number (1, 3, 5 or 7) matters, the OUTPUT setting of the
channel with even number (2, 4, 6 or 8) is ignored.
Following section describes the four different OUTPUT settings of DSA amplifiers.
2 Ohm Mode / VLD Mode
In 2 Ohm mode the power amplifier reaches maximum output power having a load of 2 Ω connected. Up to 4 cabinetts having
a nominal impedance of 8 Ω each can be driven by each amplifier channel. This mode should be used if a high number of
speaker with medium or low power rating should be driven in low impedance mode (LZ). The VLD mode (Remote Control
Module required) allows adjusting the output power of the amplifier channel. Please see page 11 for details about VLD mode.
Illustration 2.4: DUAL mode of CH 1 and CH 2 in 2 Ohm Mode
4 Ohm Mode
In 4 Ohm mode the power amplifier reaches maximum output power having a load of 4 Ω connected. Up to 2 cabinetts having
a impedance of 8 Ω each can be driven by each amplifier channel. This mode should be used if speakers with high power
rating (e.g. Subwoofers) should be driven in low impedance mode (LZ).
Illustration 2.5: DUAL mode of CH 1 and CH 2 in 4 Ohm Mode
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DIGITAL SYSTEM AMPLIFIER
70 V Mode
The 70 V mode allows connection of 70 V loudspeaker lines (Direct Drive) in high impedance mode (HZ) without using output
transformers. In this case the maximum number of loudspeakers connected to an output channel is only limited by the
amplifier‘s output power (500 W for DSA 8405/8805 or 1000 W for DSA 8410). This mode should be used if the distance
between amplifier and speaker is larger than 50 metres (approx. 150 feet) and/or a high number of small speakers with
transformer (e.g. ceiling speakers) is used.
Illustration 2.6: CH 1 in 70 V mode
100 V Mode
The 100 V mode allows connection of 100 V loudspeaker lines (Direct Drive) in high impedance mode (HZ) without using
output transformers. In this case the maximum number of loudspeakers connected to an output channel is only limited by the
amplifier‘s output power (500 W for DSA 8405/8805 or 1000 W for DSA 8410). This mode should be used if the distance
between amplifier and speaker is larger than 50 metres (approx. 150 feet) and/or a high number of small speakers with
transformer (e.g. ceiling speakers) is used.
Illustration 2.7: CH 1 in 100 V mode
2.8 Variable Load Drive (VLD)
Selecting an output mode, as described in the previous chapter, provides an extremely practical way of matching amplifiers
and connected loudspeaker systems. Table 2.3 shows all possible combinations of output power and connected load for
power amps operated in low-impedance mode. Retrofitting an optionally available Remote Control Module (e.g. RCM-810)
allows freely programming individual amplifier channels via Variable Load Drive (VLD). For power amplifier models DSA 8405
and DSA 8805 it is possible to freely select the output power in a range between 100 watts to 500 watts for loads ranging from
2 ohms to 10 ohms per channel. For the power amplifier model DSA 8410 it is possible to freely select the output power in a
range between 100 watts to 1000 watts for loads ranging from 2 ohms to 10 ohms per channel. Additionally, the Remote
Control Module RCM-810 allows switching a 50 Hz High-Pass filter on per channel. This may be advantageous when driving
small or medium sized full-range cabinets to eliminate unwanted sub-frequency content in the audio signal.
For using VLD in a power amplifier with a Remote Control Module installed, please proceed as follows:
• Set the DIP-switch MODE (see page 8) to „2 Ω/VLD“ for power amplifier channels to be operated in VLD mode.
• Use the DIP-switch OUTPUT (see page 10) to select DUAL or PARALLEL output mode for power amplifier channels to
be operated in VLD mode. VLD is not available in the BRIDGED output mode.
• Use IRIS-Net (see page 15) to configure output power, impedance and High-Pass filters of individual channels. Detailed
information on the configuration, control and monitoring of amplifiers with Remote Control Modules installed can be found
in the documentation that comes with the IRIS-Net software application.
The configuration of power amplifier channels is stored nonvolatile in the Remote Control Module. Please keep in mind that
the VLD configuration in IRIS-Net only affects channels set to „2 Ω/VLD“ mode. Operation modes 4 ohms, 70 V and 100 V are
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DIGITAL SYSTEM AMPLIFIER
not affected by VLD. Power amplifier channels behave as described in chapter 2.7. The use of VLD considerably expands the
adaptability of a power amplifier. Table 2.4 lists some application examples of VLD.
2 Ω 4 Ω 8 Ω
125 W 2 Ω Mode DSA 8x05
4 Ω Mode DSA 8x05
250 W 2 Ω Mode DSA 8x05
2 Ω Mode DSA 8410
500 W 2 Ω Mode DSA 8x05
1000 W 2 Ω Mode DSA 8410
2000 W Bridge 2 Ω DSA 8410 Bridge 4 Ω DSA 8410
4 Ω Mode DSA 8x05 or
2 Ω Mode DSA 8410
4 Ω Mode DSA 8410 or
Bridge 2 Ω DSA 8x05
4 Ω Mode DSA 8410 or
Bridge 2 Ω DSA 8x05
Bridge 4 Ω DSA 8x05 or
Bridge 2 Ω DSA 8410
Table 2.3: Maximum Output Power (VLD deactivated)
2 Ω 4 Ω 8 Ω
125 W VLD, all types VLD, all types
250 W VLD, all types
500 W
1000 W 2 Ω Mode DSA 8410
2000 W Bridge 2 Ω DSA 8410 Bridge 4 Ω DSA 8410
VLD DSA 8410 or
2 Ω Mode DSA 8x05
2 Ω Mode DSA 8x05 or
VLD DSA 8410
4 Ω Mode DSA 8x05 or
2 Ω Mode DSA 8410
4 Ω Mode DSA 8410 or
Bridge 2 Ω DSA 8x05
2 Ω Mode DSA 8x05 or
VLD DSA 8410
4 Ω Mode DSA 8x05 or
2 Ω Mode DSA 8410
VLD DSA 8x05 or
4 Ω Mode DSA 8410 or
Bridge 2 Ω DSA 8x05
VLD DSA 8410 or
Bridge 4 Ω DSA 8x05 or
Bridge 2 Ω DSA 8410
or
Table 2.4: Maximum Output Power (VLD activated)
2.9 Power on delay
The ON DELAY switch on the amplifier rear panel allows selection of the power on delay time. Following table shows possible
switch settings and corresponding delay times in seconds.
ON DELAY0123456789ABCDEF
Delay time
(in s)
0 0.15 0.3 0.45 0.6 0.75 0.9 1.05 1.2 1.35 1.5 1.65 1.8 1.95 2.1 2.25
CAUTION:
The setting of ON DELAY is ignored if a Remote Control Module is assembled.
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