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Dynacord DPA 4260 manual

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Table of contents for the manual

  • Page 1

    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-circ[...]

  • Page 2

    CONTENTS Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Installation Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 3

    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 mu sic transmission installations in offices [...]

  • Page 4

    Installation Notes Generally, it is important to install the power amplifier in a way, that ensures unhinder ed front-to-rear air circulation. When installing the power amplifier in a closed rack-shelf system, please make sure that ade quate air-flow is guaranteed. The space between the rear panel of the amplifier and the inner wall of the r ack-ca[...]

  • Page 5

    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. Peripheral pieces of audio equipment are either connected via the XLR- type input [...]

  • Page 6

    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. The labeling indicates the actual attenuation applied to the internal specified factor of amplification. Input Routing If the switch i[...]

  • Page 7

    Power Outputs – AUDIO TRANSFORMER OUTPUTS The two integrated output transformers convert the power amplifier’s nominal output volt age to the commonly used loudspeaker line voltage standards – 25 V, 70 V, and 100 V. These voltages ar e simultaneously present at the correspondent floating outputs of the binding post strip. The two power amplif[...]

  • 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 loud speaker systems should not exceed 50 meters. It is further important that the total impedance of the entire loudspeaker ne[...]

  • Page 9

    Bridged Mode Doubling the power amplifier’s output power is accomplished by engaging bridged mode ope ration, 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 cap acity of a single channel. As a[...]

  • 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. When using the power amplifier together with other equipment that operates on differen[...]

  • 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 tran[...]

  • Page 12

    Mains Operation And Leakage Power The mains power consumption as well as the leakage power is stated for driving the power amplifier at different levels. All the values were measured at nominal load via the 100 V output with two channels driven. The shown values differ only slightly when the appliance is operated at different nominal output voltage[...]

  • Page 13

    Technical Specifications: DPA 4245, DPA 4260 Amplifier at rated conditions, both channels driven, direct outputs with 8 Ω 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 8 Ω 4 Ω 100V 70V 25V 8 Ω 4 Ω 10[...]

  • Page 14

    BRIDGED MODE Direct Output Isolated Outputs Direct Output Isolated Outputs Output Definition 8 Ω 200V 140V 50V 8 Ω 200V 140V 50V Load impedance or rated output voltage Rated Load Impedance —— 57 Ω 28 Ω 3.6 Ω ——- 40 Ω 19.6 Ω 2.5 Ω isolated outputs only Rated Output Power 560 W 700 W 700 W 700W 600W 1000W 1000W 1000W THD<0.[...]