User manual ELECTRO-VOICE DPA 4245
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Manual abstract: user guide ELECTRO-VOICE DPA 4245
Detailed instructions for use are in the User's Guide.
[. . . ] 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) 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
Description . 17 18 19 19 20 27 43 44 48
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 literature accompanying the appliance.
1. [. . . ] The labeling indicates the actual attenuation applied to the internal specified factor of amplification.
Input Routing If the switch is set to parallel/mono, the input connectors CHANNEL A and CHANNEL B are electrically linked for direct parallel operation. With only a single audio signal source connected, both channels are driven, while their volume levels are still individually controlled via the level controls A and B. If the switch is set to its dual/stereo position, channels A and B are separately amplified (two channel or stereo mode).
Power Outputs A&B The loudspeaker cables are connected to the power amplifier through high-performance binding posts with the necessary screw-plugs being supplied. For connection purposes, it is possible to remove the 12-pole terminal plug. To provide flexible connections, all floating output voltages 25 V, 70 V, and 100 V (ISOLATED OUTPUTS) as well as the low-impedance output (DIRECT OUTPUTS) of both channels are directly accessible.
figure: power outputs of the DPA 4260
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. Simultaneous operation of low impedance loudspeaker systems and floating loudspeaker lines on a single power amplifier channel is possible as well.
It is possible that during operation shock-hazard output voltages can be present at the power output connectors (>34 V peak value). Therefore, the connected loudspeaker lines have to be installed in accordance to applicable security standards and regulations. When installing and operating 100 V-loudspeaker networks, compliance to the VDE regulation DIN VDE 0800 is mandatory. Especially, if a 100 V-loudspeaker network is included in alarm system applications, all security standards have to be in accordance to the security class 3 standard. Before the first operation of the power amplifier, the loudspeaker terminal strip has to be covered using the supplied protection cover.
Power Outputs - Isolated Outputs 70 V and 100 V To reduce line attenuation effects when the distance between power amplifier and loudspeaker systems exceeds 50 meters, it is recommended to employ loudspeaker systems with 100 V or 70 V line transformers, which also allows conveniently distributing the output power to the individual loudspeaker systems. It is possible to connect as many loudspeaker systems until the total power consumption of the loudspeaker network equals the nominal power handling capacity of the power amplifier; while not declining the nominal load impedance of the power amplifier outputs. For details on nominal power handling capacity and nominal load impedance of the amplifier's individual power outputs, please refer to the specifications in the appendix.
example configuration DPA 4260 with 100 V loudspeaker systems maximum load using 30 W / 100 V and 60 W / 100 V loudspeaker systems
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. It is further important that the total impedance of the entire loudspeaker network does not decline the nominal load impedance of the 25 V output. For details on the nominal load impedance of the 25 V output, please also refer to the specifications in the appendix.
example configuration DPA 4260 with 8 ohms and 16 ohms loudspeaker systems at maximum load
Power Outputs DIRECT OUTPUTS In addition to the output transformer equipped outputs and for driving low impedance, high performance loudspeaker systems, the power amplifier's direct, low impedance outputs are carried out as well, offering a minimal load impedance of 4 ohms. Each power amplifier channel is capable of simultaneously driving loads at the direct output and at the isolated output. But it is of major importance that the overall power consumption of the connected loudspeaker systems or lines does not exceed the output power capacity of the power amplifier. Example: If a loudspeaker system with 8 ohms and a nominal power handling capacity of 300 watts is connected to the DPA 4260 channel A Direct Output, this equals exactly half of the power amplifier's output power capacity since the minimal load impedance for each channel is 4 ohms. That leaves the possibility to utilizes exactly half of the nominal output power capacity of the channel A 100 V output which in this example equals 500 watts/2 = 250 watts to supply a split loudspeaker line. The total impedance of the loudspeaker line has not to decline 20 ohms*2 = 40 ohms.
example configuration DPA 4260 channel A in mixed mode
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. [. . . ] PROTECT The PROTECT-LED lights whenever one of the power amplifier's protection circuits thermal overload, RF, DC, Back-EMF is activated. In PROTECT mode all loudspeaker lines and output transformers are disconnected via relays and the power amplifier's audio inputs are short-circuited to prevent the connected loudspeaker systems from being damaged. When the power amplifier enters the PROTECT mode please examine first whether the appliance is overheated. If this is the case, the front and rear ventilation louvres are possibly covered, the nominal load impedance has fallen below the specified minimum value, or a short-circuit occurred at the power output. [. . . ]
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