A-3

architects and enginers specifications

General Information

  • 2 x 1200W @ 4 Ohm
  • Air filters
  • Stepless cooling
  • Outputstage Class H
  • TOSHIBA bipolar complemenary pair
  • 5 Protection circuits

Description

The A-Series power amplifiers are designed for sound signal high-fidelity amplification within professional sound reproduction systems.
In order to ensure high sound quality and reliability, TOSHIBA bipolar transistors are used in the output stage of the amplifier. The amplifier's schematics provides for high sound quality both in case of the lowest level of the input signal and in case of overload.
Besides the sound amplification circuitry, the amplifier contains the monitoring and control systems which ensure its faultless functioning both in the regular mode of operation and in case of emergency.

The amplifier is provided with individual protection for each channel and global protection in the bridge mode. The protective system does not switch the amplifier off, so it resumes its unattended operation after the short-circuiting conditions are gone.

The double-stage overload protection system provides both reliable output stage protection and perfect sonic quality even under overload. In case of a short-time overload lasting up to 3 msec., (e.g. overload caused by a sudden drop of total load impedance), only the output stage current protection goes active limiting the current running through the output transistors at the safe level. In this case the protection system does not preclude the amplifier from delivering, for a short while, a full output power (without any output voltage reduction) even to loads of very low impedance. In case of a more continuous overload, the protection system activates the built-in Clip-limiter, which reduces the level of the input signal and eliminates the distortion, caused by hard clipping. 		A-3

Specifications

RMS 2 ohm-
RMS 4 ohm2 x 1200
RMS 8 ohm2 x 700
Peak 4 ohm2 x 1700
Peak 8 ohm2 x 850
Bridge 4 ohm-
Bridge 8 ohm1 x 2000
AC Power16A, 230 VAC 50/60 Hz
Rrequency Response20Hz - 20kHz (+/- 0.2 dB)
10Hz - 60kHz (1dB, 1W)
Total Harmonic Dist.0.003 % (1kHz)
0.02% (20 - 20kHz)
Damping Factor600 (1kHz, 8Ohm)
Signal-to-Noise105dB
Crossover Freq.-
Weight (Kg)19
CoolingFront to back, forced
Dimensions482mm (width)
96mm (height)
2U (height in rack)
421 mm (depth)
376 mm(depth in rack)

References

Restaurant Pompstation, Amsterdam Café & Restaurant De Tuin, Rotterdam Vuig, Rotterdam Millers, The Hague Boudoir, Rotterdam

Dimensional Drawing

A-3 Dimensional Drawing

Downloads

Folder A-3 (PDF)
A3 hi-res (JPG)
Amplifier A3 Brochure (PDF)