6. Installation and operation
6.1. Installation
Fig. 20: D12 Installation
D12 amplifier enclosures are designed to fit a standard 19" equipment
rack or cabinet.
When specifying a rack, be sure to allow extra depth (10 cm / 4" is
usually sufficient) to accommodate the cables and connectors at the rear
of the amplifier(s).
When mounting amplifiers into a 19" rack cabinet, provide additional
support using shelves fixed to the inner sides of the cabinet or the
mounting holes provided on the amplifier rear mounted rack ears - do
not just rely on fixing and supporting amplifiers by their front panels.
This advice is particularly important if amplifiers are being racked up for
touring use.
Fig. 21: D12 Fan filter exchange
Since the D12 amplifier can generate a lot of heat, please ensure,
whatever the mounting or racking arrangement, that adequate cool
airflow is provided to avoid a build-up of hot air inside the rack leading
to overheating. When setting up the amplifier, do not block or cover the
rear panel air intake or the vents on the front panel of the amplifier –
see Fig. 20.
We advise frequent cleaning of the fan filter to ensure good airflow
through the unit. If the filter is visibly dirty, then it should be cleaned or
replaced – see Fig. 21. Never operate the D12 without a filter. Dust
deposits, especially combined with damp conditions, could cause the
amplifier to malfunction. If amplifiers are installed in cabinets so that
direct access to the rear panel filters is not possible, we recommend
using additional fan modules with front mounted filters that can be
easily replaced without opening the sealed cabinets.
6.2. Operation
6.2.1. Power consumption and power loss
The power required from the mains supply and the waste heat
produced by the amplifiers power loss vary depending on the load
impedance and the signal levels and characteristics (e.g. speech, music).
In practice, the theoretical peak power consumption of a system will
only be sustained for a short period of time. Basing mains current and
air conditioning plant requirements on the peak power consumption of
the sound system would result in a generously over-specified
installation. The key factor in power consumption calculations is the crest
factor (CF) of the music or speech signal - the ratio of peak to
sustainable RMS voltage of the signal.
A crest factor of 2.4 represents 1/3 of the maximum sine output power
and it can be seen as the worst case signal that can be accessed in real
world conditions. A proper power distribution should be able to handle
the current ratings given in the table below (Tab. 8) referring to CF 2.4.
Using the D12 temporarily with well known signals of higher crest
factor, the power distribution can be downsized within the range given
in the table.
D12 Amplifier, Hardware manual (4.9 EN) Page 20 of 28
(32 Seiten)
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