Part - Studio Lights

KNOW-HOW 100 V PA TECHNOLOGY
GENERAL INTRODUCTION INTO THE 100V PA TECHNOLOGY
The following tips, explanations and illustrations are to approximate and facilitate the
planning, configuration and subsequent service of 100V PA systems to you.
As an introduction, we may state in many cases it is the 100V PA technology which
makes a commercial acoustic irradiation principally possible, whereas it would be not at
all, or only very hard and insufficiently possible, to implement effective systems with lowimpedance
technology; this being popular first of all as entertainment electronics.
In the following, we would like to give you some typical examples for the application of
100V PA technology, which you will find again in the second part of this “guideline” supplemented
by schematic drawings, circuit diagrams and explanations.
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Sports fields and halls
Open air and indoor baths
Supermarkets and big stores
Churches and chapels
Car dealers and petrol stations
Office and administration buildings
Hotels and inns
BASIC CHARACTERISTICS OF THE
100V PA TECHNOLOGY
It is important and basic to realize that 100V PA systems are
practically always built in “Mono”.
This is no issue of quality, as a mono signal is not worse than
a stereo signal. But, in order to use a stereo signal expediently,
2 loudspeakers and 2 power amplifiers have to be
supplied, and furthermore the listeners have to be in the proper
position and distance to the speakers – and also stay
that way. Needless to say that this is impossible, especially
when you look at the above mentioned application examples.
Naturally, a horn speaker does not have the same transmission
quality as a Pro-Sound speaker. This does not at all
deal with the approach mono against stereo, but solely with
the situation of application which differs from case to case.
Referring to 100V transformers:
A modern 100V transformer is easily able to achieve a frequency
response of 50 – 20,000 Hz which is fully sufficient
for top quality acoustic irradiation. However, in practice such
a frequency response is normally not required for commercial
PA systems.
Normally, a 100V PA system consists of three parts, which
are:
– Microphone or microphone station
– Amplifier with components
– Loudspeaker
The signal sent to the amplifier by either a microphone or a
similar device, is edited by the amplifier and its component
units and finally provided at the outputs. There, the signal is
changed to 100V by a transformer which is normally installed
in the amplifier.
There is also a 100V transformer embedded in the loudspeaker,
which changes the incoming signal again to the appropriate
impedance for the particular speaker frame (usually 4,
8 or 16 ohms).
Since the number of required loudspeakers for PA systems
is normally high or very high, the 100V technology can show
all its strength in wiring as well as in the desired allocation of
signals.
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