Dynacord DPA 4245 Owner's Manual
Promatrix system 2x450 watts power amplifier
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Also See for DPA 4245:
- Owner's manual (48 pages) ,
- Service manual (29 pages) ,
- Brochure & specs (72 pages)
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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
15
OWNER'S MANUAL
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Summary of Contents for Dynacord DPA 4245
- Page 1 OWNER’S MANUAL 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)
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Page 2: Table Of Contents
CONTENTS Description ............17 Installation Notes . -
Page 3: Description
DESCRIPTION Especially designed for permanent installations, the DPA-Series power amplifiers offer performance-con- sistent 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
Installation Notes Generally, it is important to install the power amplifier in a way, that ensures unhindered front-to-rear air circulation. When installing the power amplifier in a closed rack-shelf system, please make sure that adequate air-flow is guaranteed. The space between the rear panel of the amplifier and the inner wall of the rack-case has to be at least 60 mm x 330 mm. -
Page 5: Inputs
Inputs INPUT CHANNEL A&B With an input sensitivity of 775 mV = 0 dBu and an input impedance of 20 k ohms, the electronically balanced inputs – INPUT CHANNEL A&B – are meant for the connection of control amplifiers, audio controllers, mixing consoles, etc. - Page 6 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 ampli- fication. This control should be positioned between the 0 dB and the -6 dB marks to prevent distortion in source devices.
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Page 7: Outputs
Power Outputs – AUDIO TRANSFORMER OUTPUTS The two integrated output transformers convert the power amplifier’s nominal output voltage to the commonly used loudspeaker line voltage standards – 25 V, 70 V, and 100 V. These voltages are simultaneously 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, where 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 The ground lift switch helps is a perfect means for eliminating possible ground noise loops. In case the power amplifier is operated together with 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 thermal overload of the mains transformer output voltage overload limiters High-level signals in the low frequency range can drive the output transformers of power amplifiers that do not provide audio signal limiters into saturation, resulting in nasty distortion and high thermal load of...
- Page 12 5 x 20 mm power supply IEC 127 print 84171/1 T1A 250V 5 x 20 mm 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 Technical Specifications: DPA 4245, DPA 4260 Amplifier at rated conditions, both channels driven, direct outputs with 8 loads, isolated outputs with rated load and voltage, unless otherwise specified. DPA4245 DPA4260 DUAL MODE Direct Output Isolated Outputs Direct Output Isolated Outputs...
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Page 14: Dimensions
BRIDGED MODE Direct Output Isolated Outputs Direct Output Isolated Outputs Output Definition 200V 140V 200V 140V Load impedance or rated output voltage Rated Load Impedance —— ——- 19.6 isolated outputs only Rated Output Power 560 W 700 W 700 W 700W 600W 1000W...
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