DESIGN AND FUNCTIONAL FEATURES
Design
The built-in .power amplifier is designed as a mono-block unit. All its components are
installed on a single bearing panel placed inside the case which protects the unit and ensures
its deep placement into the body of a speaker system.
Power to the built-in power amplifier is supplied via a removable power cord.
The amplifier incorporates:
–
power supply source;
–
power amplifier;
–
input section.
Power Supply Source
Switcheable. Made to minimize the weight of the amplifier.
Power Amplifier Schematics
The power amplifier is designed according to Class D technology to deliver high
efficiency and least heat. The high switching rate ensures the high sound quality comparable
with the best analogue amplifiers.
Cooling System
The amplifier is cooled down with a fan. The cooling system ensures reliable cooling
within the whole operating temperature range (5 to 35
°
Ñ
). The cooling system is a double-
mode system which ensures smooth cooling intensity rate switching in the fan-ON mode. At
a normal temperature and low output level the fan is OFF, thus generating no noise. When
the amplifier is set to deliver a high output power, as well as when the ambient temperature
is higher than normal and when the heat sink becomes too hot, the fan goes ON, and the
cooling intensity rate changes smoothly as the temperature rises.
Overload and Short-Circuit Protection
This protective system becomes active in case of short-circuited output or overload
caused by reduced load impedance. It disables the output signal of the respective channel
for 0.5 second and then the amplifier gradually resumes its delivery.
DC Output Protection
The amplifier
’
s schematics precludes transit of any clicks or noise during the power-on/
off transition process. Moreover, the amplifier protects the speaker system where it is
installed against damage by DC voltage or powerful LF fluctuations in case of their
occurrence on the output of the amplifier. In this case its power source goes off and all LEDs
go off too, including the POWER LED.
The power amplifier can be restarted by consecutive switching OFF and ON with the
POWER key. If the DC is an occasional problem (which is unlikely) the amplifier goes ON and
resumes its normal functioning. If, otherwise, the DC output problem persists through the
fault of the amplifier, then upon switching, the amplifier goes ON but in a short while the DC
output protection system disables the power supply source.
11
SPECIFICATIONS
Output Power:
1000W
(8 Ohm, 100Hz, 230V)
Peak Output Power:
1200W
(8Ohm, 10ms, 230 V)
Frequency Response*:
45 Hz
–
80...350 Hz
(1000W, 8Ohm)
Total
Harmonic Distortion:
0.05%
(45Hz - 350Hz, 8Ohm)
Slew Rate:
20 V/µs
(LF filter disabled)
Damping Factor:
over 200
(100Hz, 8Ohm)
Signal-to-Noise Ratio:
98dB
(unweighted)
Sensitivity:
775 mV
High-pass
Filter Cutoff Frequency:
45Hz
(basic model)
High-pass Filter Slope:
24 dB/oct
Low-pass Crossover
Filter Cutoff Frequency:
80
–
350 Hz
Crossover Low-pass
Filter Slope:
12 dB/oct
Power Requirements:
AC230V, 50/60Hz
Weight:
4kg
Dimensions:
198 mm
(width)
407.5 mm
(height)
104 mm
(depth)
Note:
* The basic model frequency response which can vary depending on the filter frequency settings.
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