Battery operation 24V DC, Input | Dynacord DPA 4140, DPA 4120

If the appliance is correctly connected and mains is present the green STANDBY indicator (4) will light. To remotely start the amplifier when it is being operated on the mains, it is necessary to interconnect the contacts 3 - POWER REMOTE and 2 - GROUND STANDBY on the pin terminal strip REMOTE CONTROL (16) (see also paragraph 5.6).

The main power switch POWER (9) on the rear of the appliance is meant for service and maintenance purposes. This allows bridging the mains switching relay, which provides the possibility to operate the amplifier without remote start.

Note	The main power switch POWER (9) on the appliance's rear is only meant for maintenance.
	Remotely switching off the device is not possible when the POWER switch is engaged.

Both amplifiers, the DPA 4120 and the DPA 4140, employ power-on switching delays of approximately 3 sec. After this time, the green READY indicator lights and the READY fault message relay picks up when no error is being detected (see also paragraph 6.2).

3.2Battery operation 24V DC

The amplifiers, DPA 4120 and DPA 4140, use the mains or alternatively an external 24V battery as power source. Switching to battery is performed via integrated relays.

The battery has to be connected on the rear of the amplifiers (20) using insulated 6.3x0.8 mm AMP flat plug connectors. The amplifiers are protected against polarity-mismatch. Each, the positive and negative conductors are internally protected by fuses, located on the printed board assembly 85270 (DPA 4120) respectively 85268 (DPA 4140) (see also paragraph 11, figure 10 and 11).

The cable used for battery connection has to be at least 1.5 mm2 in diameter (DPA 4120) respectively 2.5 mm2 (DPA 4140). Using these diameters, the cable length for the one way distance should not exceed 4.0 m (max. voltage drop <1V).

Caution The DPA 4120 and DPA 4140 are to be operated only using ungrounded batteries or batteries with grounded negative pole. Operation with grounded positive pole is not permissible.

4.INPUT

The electronically balanced INPUT (14) providing a sensitivity of 775mV = 0dBu is meant for the connection of control amplifiers. In case it is intended to supply several power amplifiers with identical input signals, these signals can be taken from the THRU connector (15) (see also figure 1 and 2).

The input is prepared to be retrofitted with a input transformer. In case a floating input is needed, it is necessary to install the optional extension NRS 90208 (see also paragraph 8.3).

On the general input module NRS 90225 the input level is set with the level control (13). For the remote control module NRS 90222 the input level is determined by the setting of the internal electronic level control of the PROMATRIX manager DPM 4000 (please also refer to the PROMATRIX handbook).

figure 1 connections of the input sockets

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.