d&b D80 - Manual (Page 70)

Maximum cable length for 5 % voltage drop at 3600 W mains power draw
Cable cross section
100 V 120 V 208 V 230 V
1.3 mm 2 - AWG 16 Not permitted Not permitted 21 m/69 ft 25 m/82 ft
1.5 mm 2 Not permitted Not permitted 24 m/79 ft 29 m/95 ft
2.1 mm 2 - AWG 14 Not permitted Not permitted 33 m/108 ft 40 m/131 ft
2.5 mm 2 Not permitted Not permitted 40 m/131 ft 49 m/161 ft
3.3 mm 2 - AWG 12 12 m/39.5 ft 18 m/60 ft 53 m/174 ft 64 m/210 ft
4.0 mm 2 15 m/50 ft 21 m/69 ft 63 m/206.5 ft 78 m/256 ft
5.3 mm 2 - AWG 10 19 m/62 ft 28 m/92 ft 83 m/272 ft 102 m/334.5 ft
6.0 mm 2 22 m/72 ft 32 m/105 ft 95 m/312 ft 116 m/380.5 ft
8.4 mm 2 - AWG 8 31 m/101 ft 44 m/144 ft 133 m/436 ft 162 m/531.5 ft
12.1.6. Generator operation/UPS requirements
To operate the amplifier using a mains generator or uninterruptible
power supply (UPS), observe the following:
–
With the D80 amplifier 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 7 kVA per D80. 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.
12.2. Power amplifiers
The power amplifiers fitted to the D80 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, it maintains high
efficiency with any kind of signal and load and runs 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.
d&b D80 Manual 1.9 en 70