Operating manual ASR Emitter I HD and II HD Page 19
ASR Audio Systems Friedrich Schäfer P.O. Box 1722, D- 35 727 Herborn
+49 27 72 / 4 29 05
Technical data
The Emitter I and II are main amplifiers with level control and input selector. The stepped
relay switch has 75 dB controlling volume and remote control operation, 6 high level inputs
are switched with relays, one input has allows rear tape control.
Input circuit with FET- inputs and separate voltage supply, output stage with high internal feedback. The
complete construction is made with complementary MOS-FET transistors.
Temperature dependent regulation of the quiescent current 400 mA (600 mA at EM II), high
operation in the Class Ampere- field, DC- amplification and offset regulation series.
The motherboard is double sided with 2x 120µ copper plumbed tin, the signal connection on the
motherboard are completely located in shielding areas, separate grounding at every side for signal connection
and voltage supply, complete soldering is made with silver soldering, no condensers in the signal path, the
supply voltage buffering is made with fast electrolyte and plastic foil capacitors.
Sine-wave power 20-20.000 Hz, 0.1% distortions, both channels operation
Emitter I HD 8 Ohm 2x160 Watt, 4 ohms 2x290 Watt, 2 ohms 2x520 Watt, 1 ohm 2x 750 Watt
Emitter II HD 8 Ohm 2x280 Watt, 4 ohms 2x500 Watt, 2 ohms 2x900 Watt, 1 ohm 2x1400 Watt
Maximum impulse power values are approximately the rated output multiplies by 1,5
Distortions from 50 milliwatt to -1db under rated output with 1 kHz <0.02, of 20-20.000 Hz <0.1%
Signal-to-noise ratios at 1 Watt / 8 ohms,> 90 dB
Frequency response - 3db of 0.1 hertz to 500 kHz
Input impedance 10 kilo Ohm
Input sensitivity
for 34,6 Volt AC output voltage (150 Watt to 8 ohms), position 1 = 2 Volt, position 2 = 0.4 Volt
Separate supply for the input stage +18 Volt/ 86.000 uF (152.000 µF EM II),
the voltage amplifier stage with +76 Volt has 40.000 uF (+ 96 Volt/ 60.000 µF EM II),
and the current output stage + 60 Volt is equipped with 400.000 µf (+78 Volt/ 600.000 µF EM II).
The power units are separated with 2x 700 VOLT-AMPERE (4x 700 VOLT-AMPERES) rated output, more
than each 1000 VOLT-AMPERES of pulse power ever Philbert- coat cut transformer, separate transformers
and rectifiers for the positive and negative voltages ( 2 transformers in separate cases per channel at EM II).
For supply of + 15 Volt to the input stage and to the controls voltage, a further transformer of 72 VOLT-
AMPERES is installed.
The switch ON is made with a starting current limit via 5 relays per power unit. The case is produced of
sheet metal for better shielding and equipped with an acrylic glass front panel.
Dimensions and weights (W x L x H)
Emitter I : 420 x 410 x 180 mm, amplifier 18 kg, PM- power unit 430 x 320 x 150 mm, 32 kg
Emitter II: 570 x 440 x 230 mm, amplifier 42 kg, 2x PM- power unit 430x320x150 mm each 32 kg
technical improvements reserved
