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Dynacord DPA 4245 Owner's Manual

Dynacord DPA 4245 Owner's Manual

2 x 450 watts/ 2 x 600 watts pro matrix system
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DPA 4245 / DPA 4260 POWER AMPLIFIER
Features
2 x 450 watts output power capacity DPA 4245
2 x 600 watts output power capacity DPA 4260
floating 100 V / 70 V / 25 V power outputs (isolated outputs)
low impedance outputs (direct outputs)
bridged mode operation, switchable
all outputs are protected against idling and short-circuit
mains supply 230 V AC 50/60 Hz
POWER REMOTE function
service mains switch
active ventilation via 2 temperature-controlled DC-fans
electronically balanced inputs
routing switch for parallel linked operation
input gain controls
integrated audio limiters
power-on switching noise suppression
protection circuitry: DC/HF, Back-EMF, output voltage overload limiters, initial inrush current limiter,
output peak current limiter
18 dB/oct. LO-cut filter at 45 Hz
SIGNAL and LIMIT indication for optical monitoring
thermal overload protection for the heat sink and the internal power supply, with PROTECT-function
inputs transformers for balanced, floating operation are optionally available
XLR-type and binding post clamping input connectors
19" frame size, 3 HU
CH A
CH B
LIMIT
PROTECT
SIGNAL
POWER
OWNER'S MANUAL
DPA 4245
2 x 450 WATTS POWER AMPLIFIER

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Summary of Contents for Dynacord DPA 4245

  • Page 1 2 x 450 WATTS POWER AMPLIFIER SIGNAL POWER Features • 2 x 450 watts output power capacity DPA 4245 • 2 x 600 watts output power capacity DPA 4260 • floating 100 V / 70 V / 25 V power outputs (isolated outputs) •...
  • Page 2: Important Safety Instructions

    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 sufficient 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...
  • Page 3: Table Of Contents

    CONTENTS Description ................... Installation Notes ................. Rear View .................... Inputs ....................Outputs ....................Specifications ..................Block Diagram ..................Dimensions ..................DESCRIPTION Especially designed for permanent installations, the DPA-Series power amplifiers offer performance-consistent and reliable operation of PA-systems with 2 individual loudspeaker lines, each. Therefore, DPA-Series power amplifiers are most suitable for company intercom, alarm and background music transmission installations in offices and commercial areas, congregation and sport centers, schools, houses of worship, hotels, hospitals, shopping malls and super markets, cruise ships, and other similar applications.
  • Page 4: Installation Notes

    DYNACORD service center, before further use.Cleaning the appliance should not be performed using chemical solvents or sprays, as this might damage the finish and could even cause hazard fire.
  • Page 5: Inputs

    230V 50-60 Hz CAUTION 870 WATTS CHANNEL A CHANNEL B RISK OF ELECTRIC SHOCK INPUTS INPUTS DO NOT OPEN INPUT ROUTING CIRCUIT MAINS FUSE POWER REMOTE CHASSIS SWITCH DUAL T10A/L/250V POWER GROUNDED 0 dB 0 dB UNGROUNDED SEE OPERATING MANUAL! LEVEL LEVEL PARALLEL...
  • Page 6: Outputs

    figure: block diagram input channel A figure: printed board assembly area channel A – transformer retrofitting Level Control dB-scaled rotary controls for adjusting the power amplifier’s overall amplification. This control should be positioned between the 0 dB and the -6 dB marks to prevent distortion in source devices. The labeling 0 dB indicates the actual attenuation applied to the internal specified factor LEVEL...
  • Page 7 Power Outputs – AUDIO TRANSFORMER OUTPUTS The two integrated output transformers convert the power amplifier’s nominal output voltage to the com- monly used loudspeaker line voltage standards – 25 V, 70 V, and 100 V. These voltages are simulta- neously present at the correspondent floating outputs of the binding post strip. The two power amplifier channels can be operated using any possible output voltage combination.
  • Page 8 Power Outputs - Isolated Outputs 25 V The floating 25 V output is mainly used for driving low impedance loudspeaker systems (4 - 16 ohms). Because of the effect of line attenuation, the distance between power amplifier and loudspeaker systems should not exceed 50 meters.
  • Page 9 Bridged Mode Doubling the power amplifier’s output power is accomplished by engaging bridged mode operation, whe- re the two power amplifier output stages are linked for push-pull operation. In other words, a monaural power amplifier is “created” offering double the output voltage and double the output power capacity of a single channel.
  • Page 10 GROUND Lift Switch CIRCUIT The ground lift switch helps is a perfect means for eliminating possible CHASSIS SWITCH ground noise loops. In case the power amplifier is operated together with GROUNDED other equipment inside of a rack shelf system, the switch should be set to its GROUNDED position.
  • Page 11 Protection Circuitry • The DPA-Series power amplifiers are equipped with extensive protection circuitry: • initial current inrush limiter • power-on delay • RF and DC protection • Back-EMF protection • limiters for the audio signals • output peak-current-limiters • thermal overload of the heat sink •...
  • Page 12 IEC 127 print 84171/1 power supply T1A 250V 5 x 20 mm IEC 127 Extension Kits For The DPA 4245 And The DPA 4260: NRS 90208 balanced input (input transformer for a single channel) NRS 90235 1 pair of rack-mount ears...
  • Page 13: Specifications

    Technical Specifications: DPA 4245, DPA 4260 Amplifier at rated conditions, both channels driven, direct outputs with 8W loads, isolated outputs with rated load and voltage, unless otherwise specified. DPA4245 DPA4260 DUAL MODE Direct Output Isolated Outputs Direct Output Isolated Outputs Output Definition 8Ω...
  • Page 14: Dimensions

    BRIDGED MODE Direct Output Isolated Outputs Direct Output Isolated Outputs Output Definition 8Ω 200V 140V 8Ω 200V 140V Load impedance or rated output voltage Rated Load Impedance —— 57Ω 28Ω 3.6 Ω ——- 40Ω 19.6Ω 2.5 Ω isolated outputs only Rated Output Power 560 W 700 W 700 W...
  • Page 16 Abmessungen / Dimensions 132,5...
  • Page 17 Bosch Communications Systems Asia & Pacific Rim–Headquarter Asia Americas–Headquarter Americas Europe, Africa & Middle-East Singapore: Telex Communications (SEA) Pte Ltd Telex Communications, Inc. Headquarter EAME 12000 Portland Ave South, EVI Audio GmbH 38C Jalan Pemimpin Burnsville, MN 55337, USA Hirschberger Ring 45, D-94315, Singapore 577180 USA–Ph: 1-800-392-3497 Straubing, Germany...

This manual is also suitable for:

Dpa 4260