14.1.5. Generator operation/UPS requirements
To operate the amplifier using a mains generator or uninterruptible
power supply (UPS), observe the following:
▪ With the 10D/30D amplifiers the apparent power figure (VA
value) is about the same as the effective power figure (W
value).
▪ Use a generator or UPS that can deliver the maximum power
required by the entire system. Assume a short time power draw
of 1.3/2.2 kVA per 10D/30D. This is particularly important
when using a UPS without dedicated short-time overload
capability.
▪ Run the generator or UPS at 220 to 240 V, if available. 50 or
60 Hz is not an issue.
14.2. Power amplifiers
The power amplifiers fitted to the 10D/30D utilize Class D
technology similar to a switch mode power supply. Compared to
the known linear amplifier concept (Class A, AB, G or H), Class D
power amplifiers produce less heat and allow for a compact and
light-weight design.
While supplying very high maximum output swing, they maintain
high efficiency with any kind of signal and load and run as cool as
possible. Channels share the same power supply and are thermally
coupled to provide even higher average power figures when
unevenly loaded. TOP/SUB setups and active cardioid subwoofers
are cases of typical use. A sophisticated circuit design decreases
the impact of the load on the amplifier performance and enables a
well defined sound reproduction. A comprehensive set of
protection features individually prevents each channel from
overload and/or damage/defect. Channels that are not affected
will continue to operate, if safely possible.
14.3. Cooling fans
Two temperature and level controlled fans are incorporated for
cooling the internal components, which allows greater cooling
during louder program material. The fan speed is consequently
reduced during quieter passages preventing background noise
interference. If the unit heats up a «Temp. Warning» is issued and
the fans will give full cooling power permanently.
d&b 10D/30D Manual 1.10 en78
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