General
Output power	750 W (Programme)
Input sensitivity	1 V
Input impedance	10 kOhm
Input type	Symmetric
Output voltage	100 V
Signal-to-noise ratio	91 dB
THD at 1 kHz	0,29 %
AC power supply	230 V
DC power supply	24 V
Power consumption (sinusoidal signal, AC)	4 A
Power consumption (sine signal, DC)	27 A
Power consumption (standby, AC)	0,034 A
Power consumption (standby, DC)	0,12 A
Power consumption (no signal, AC)	0,09 A
Power consumption (no signal, DC)	0,5 A
Power consumption (standby)	9,9 W
Power consumption (no signal)	19,2 W
Power consumption (sinusoidal signal)	624 W
Housing format	2 RU
Protection circuits	No-load, short circuit, overtemperature, make delay
Cooling	Maintenance-free, fanless
LED indicators	Signal and operating states
Fault alarm contacts	For emergency power and final stage
Input transformer (optional)	TSE-203
Pilot tone input

The RCS Audio-Systems DBA-500D is a digital 100 V power amplifier designed for professional use in sound systems. It is particularly suitable for ELA systems in accordance with VDE 0828/EN 60849, for which it is predestined by the integrated pilot tone input and fault alarm contacts for emergency power and amplifier. The digital technology enables an efficiency of over 90 %, which, compared to analogue amplifiers with approximately 70 %, results in significantly lower waste heat. This reduces the cooling requirement in 48,3 cm ( 19 inch )-centres and may eliminate the need for additional room cooling. The low waste power also positively affects battery capacity in emergency power operation, as less energy is required for power supply.

Applications

The amplifier is designed for continuous operation in professional installations, particularly in environments where quiet operation is required, such as offices, churches or conference rooms. The maintenance-free cooling without fans prevents contamination and reduces follow-up costs. The shallow depth of 260 mm and recessed volume controls facilitate installation in standard 48,3 cm ( 19 inch ) racks.

Functions and equipment in detail

The DBA-500D features symmetrical inputs and speaker outputs on screw connectors, reducing wiring effort. The inputs can optionally be equipped with input transformers (TSE-203) to optimise signal transmission. LED indicators on the front panel provide information on signal and operating status. In standby mode, which is automatically activated when no signal is present, the amplifier consumes a maximum of 9.9 W. When a signal is applied, for example during alarms, the amplifier is operational within 30 ms.

Technology explained simply

The digital amplifier stage operates with an output power of 750 W (programme) and 500 W (RMS) at an output voltage of 100 V or 70 V. The frequency response curve lies between 90 Hz and 20,000 Hz (better than -3 dB), enabling clear reproduction of speech and music. The signal-to-noise ratio is 91 dB, and the THD at 1 kHz is less than 0.29 %. The external voltage margin is specified at 85 dB at 1 kHz. Power supply is via 230 V AC (50–60 Hz) or 24 V DC (emergency power supply). Power consumption is 4 A (230 V AC) or 27 A (24 V DC) with sinusoidal signal, and 0.034 A (230 V AC) or 0.12 A (24 V DC) in standby mode.

Compatibility and accessories

The amplifier is designed for operation with 100 V or 70 V systems and meets the requirements of standard IEC 268-5 regarding output power and protection circuits. The integrated protection functions include protection against no-load, short circuit, overtemperature, as well as a power-on delay. For extending input functions, the input transformer TSE-203 can be optionally added per input.

Mounting and installation

The amplifier is designed in 2 RU format (483 mm width, 88 mm height, 260 mm depth) and can be mounted in standard 48,3 cm ( 19 inch ) racks. The screw connectors for inputs and outputs facilitate installation. The maintenance-free cooling without fans reduces maintenance effort and noise emissions.

Advantages in operation

The high efficiency of digital technology leads to lower operating costs and longer service life. The low waste heat and maintenance-free cooling reduce maintenance effort. The fast response time in standby mode ensures reliable alarm activation. The integrated protection functions increase operational safety.