Dynacord DPA 4140, DPA 4120 owner manual Checking the pilot tone surveillance function

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NRS 90 224

S 406

S 405

B 411

figure 9 printed board assembly 84175 in the DPA 4140 showing the NRS 90224 pilot tone & ground fault surveillance and the bridges B411 and S405, S406 for switching the output voltage; inserted

Checking the pilot tone surveillance function:

When the NRS 90224 is installed and the power amplifier is switched on, the green READY indicator (7) has to light. The testing and reset button TEST (3) serves as a function control for the pilot tone surveillance. With the TEST button being engaged, the 19 kHz generator is inactive. The green READY indicator is off and the READY fault message relay drops. Approximately 3 seconds after releasing the TEST button, the indicator has to light again. This method can also be used to check system configurations with average-switching.

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Contents Power Amplifier DPA 4120 / DPA Performance FeaturesPage Indicators, controls and connections 12 aContents Installation UtilizationAmplifier has to be protected from Before the first operationBattery operation 24V DC InputPower Output for 100V 70V or 50V loudspeaker systems OutputsPower Output for low impedance loudspeaker systems Remote Control connector only NRSIndicators Single Call and obligatory reception relays Override BypassStandby indicator Ready indicatorProtect indicator Ground Fault indicatorEnhanced application field Standard input module NRS Remote module NRS NRS 90208 input transformer for the floating, balanced inputRe-insert the input module and tighten the locking screws B Ground fault surveillance NRS 90224 pilot tone & ground fault surveillancePilot tone surveillance NRS 90 406 S 411 Checking the pilot tone surveillance function Checking the ground fault surveillance function Case and 19-rack-shelf system installationGround lift switch Circuit ⊥ to Chassis Switch Fuses Fuses in the DPA503 502 503 F 601 602 Battery operation DPA 4140 power amplifier 400 W Power supply Extension kits for the DPA 4120 and DPA 13.5.2 Ground fault surveillanceNRS 90208 input transformer for floating, balanced input

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DPA 4120, DPA 4140 specifications

The Dynacord DPA 4120 and DPA 4140 are powerful amplifier solutions designed for professional audio applications. These models are ideal for live sound reinforcement, permanent installations, and various audio distribution requirements.

Both DPA 4120 and DPA 4140 are part of the Dynacord DPA series, which is renowned for delivering high-quality sound and reliability in demanding environments. The DPA 4120 provides a robust 1200 watts of power per channel at 4 ohms, while the DPA 4140 ups the ante with an impressive 1400 watts per channel at the same impedance, making them suitable for driving a wide range of speaker systems.

One of the standout features of both amplifiers is the incorporation of advanced DSP (Digital Signal Processing) technology. This technology offers precise control over sound performance, allowing users to tailor settings to meet specific venue acoustics or personal preferences. The DSP includes functions such as equalization, crossover adjustments, delay, and limiting, ensuring optimal sound delivery in any setting.

Durability is another hallmark of the Dynacord DPA series. The amplifiers feature a rugged, lightweight design, ideally suited for touring and rental companies. The internal architecture includes a sophisticated cooling system that allows for extended operation under high-demand conditions without overheating.

Both models are equipped with a range of connectivity options, including XLR inputs and Speakon outputs, facilitating seamless integration with various audio systems. The amplifiers support both analog and digital input sources, ensuring compatibility with modern audio setups.

In terms of sound quality, the DPA 4120 and DPA 4140 are engineered with low distortion levels and high efficiency, achieving high-performance audio output while maintaining clarity and detail across all frequencies. The amplifiers also feature a robust power supply that delivers consistent performance, even during peak use scenarios.

User-friendly controls and monitoring options are also inherent in the design of these amplifiers. An intuitive front panel interface allows for easy adjustment of settings, while LED indicators provide real-time feedback on performance and operational status.

In summary, the Dynacord DPA 4120 and DPA 4140 offer exceptional power, sound quality, and advanced features, making them excellent choices for audio professionals seeking reliable and powerful amplification solutions. Their combination of performance, durability, and versatility serves to meet the needs of various professional audio applications, solidifying their place in the competitive landscape of audio amplifiers.