Multi-zone digital amplifier-preamplifier


250W preamplifier preamplifier on 20 zones

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Characteristics :

  • Digital mixing amplifier class D, 250 W, 20 Zones S-2520D
  • Input CH1 :
  • chime 2 tones
  • Siren function: wave, flat, DIN3304
  • Tel/Paging call input
  • Module location
  • Recording output
  • PRE OUT output
  • Super priority message: PTT / MIC1 are priority digital message (SD card)
  • The PTT entrance has priority over the siren.
  • In the event of a power failure, when the power is restored, the amplifier will restart according to the initial conditions.
  • High efficiency of the PWM CLASS-D amplifier
  • Microprocessor that controls all of the amplifier's functions (Micom)
  • High S.M.P.S. circuit efficiency (AC/DC, DC/DC)
  • Input circuit protection
  • Overload protection
  • Overvoltage protection
  • Overheating protection
  • Two power supply levels to limit energy consumption
  • It goes into stand-by mode when there is no signal at the input, it resumes operation automatically as soon as a signal is received.
  • E/M priority input, E/M emergency message for SD memory card automatically broadcast for evacuation.
  • RS 485 communication for remote control (On/Off, amplifier status monitoring, volume control)
Output power250W

Output impedance

40 Ω / 100V, 4 Ω



Output zone

20 zones

Inputs 1-7

7 (MIC/LINE x 5, LINE x 2),



1) PTT/MIC-1;

2) Digital Message;

3) TEL, CH-2;

4) CH-3-CH-7, USB/PACK

Signal-to-noise ratio

MIC > 70 dB LINE > 100 dB

Distortion Rate

≤ 0,5 % (1KHz)

Frequency Response

MIC : 200 – 20000 Hz,

LINE : 40 – 20000 Hz

Input sensitivity

MIC:-50dBu 5K Ω BAL,

LINE :-10dBu 15K Ω BAL

Power supply

AC 230 V 50 Hz – DC 24 V


483 x 350 x 133 mm (3U)


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