Table of Contents
Advertisement
Maximum cable lengths for 5 % voltage drop at 3600 W mains power draw
Cable cross section
100 V
Not permitted
1.3 mm
2
- AWG 16
2
Not permitted
1.5 mm
2
Not permitted
2.1 mm
- AWG 14
Not permitted
2.5 mm
2
12 m/39.5 ft
2
3.3 mm
- AWG 12
2
15 m/50 ft
4.0 mm
19 m/62 ft
5.3 mm
2
- AWG 10
22 m/72 ft
6.0 mm
2
2
31 m/101 ft
8.4 mm
- AWG 8
d&b 40D Reference manual 1.3 en
▪ When three amplifiers are operated with a three-phase (120°)
mains supply, the current on the N (neutral) conductor can be
minimized by matching loads and signals between the three
devices.
▪ Keep the supply line as short as possible and its cross section as
high as possible, especially when operating the device at 100
to 127 V. Voltage drop at full load (20/13 A at 115/230 V)
should not exceed 5 %. For reference specifications, refer to the
following table.
120 V
208 V
Not permitted
21 m/69 ft
Not permitted
24 m/79 ft
Not permitted
33 m/108 ft
Not permitted
40 m/131 ft
18 m/60 ft
53 m/174 ft
21 m/69 ft
63 m/206.5 ft
28 m/92 ft
83 m/272 ft
32 m/105 ft
95 m/312 ft
44 m/144 ft
133 m/436 ft
8.1.6 Generator operation/UPS requirements
To operate the amplifier using a mains generator or uninterruptible
power supply (UPS), observe the following:
▪ With the 40D 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 3 kVA per 40D. 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.
8.2 Power amplifiers
The power amplifiers fitted to the 40D 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/fault. Channels that are not affected will
continue to operate, if safely possible.
Operation (Hardware references)
230 V
25 m/82 ft
29 m/95 ft
40 m/131 ft
49 m/161 ft
64 m/210 ft
78 m/256 ft
102 m/334.5 ft
116 m/380.5 ft
162 m/531.5 ft
33
Advertisement
Table of Contents
