Adventures In Audio with Audio Masterclass
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The microphone is the front-end of almost all sound engineering activities
and, as the interface between real acoustic sound travelling in air and the
sound engineering medium of electronics, receives an immense amount of attention.
Sometimes one could think that the status of the microphone has been raised
to almost mythological proportions. It is useful therefore to put things in
their proper perspective: there are a great many microphones available that
are of professional quality. Almost any of them can be used in a wide variety
of situations to record or broadcast sound to a professional standard. Of course
different makes and types of microphones sound different to each other, but
the differences don't make or break the end product, at least as far as the
listener is concerned.

Now, if you want to talk about something that really will make or break the
end product, that is how microphones are used. Two sound engineers using the
same microphones will instinctively position and direct them differently and
there can be a massive difference in sound quality. Give these two engineers
other mics, whose characteristics they are familiar with, and the two sounds
achieved will be identifiable according to engineer, and not so much to according
to microphone type.

There are two ways we can consider microphones, by construction and by directional
properties. Let's look at the different ways a microphone can be made, to start
off with.

Microphone Construction

There are basically three types of microphone in common use: piezoelectric,
dynamic and capacitor. The piezoelectric mic, it has to be said, has evolved
into a very specialized animal, but it is still commonly found under the bridge
of an electro-acoustic guitar so it is worth knowing about.

Piezoelectric

The piezoelectric effect is where certain crystalline and ceramic materials
have the property of generating an electric current when pressure or a bending
force is applied. This makes them sensitive to acoustic vibrations and they
can produce a voltage in response to sound. Piezo mics (or transducers as they
may be called – a transducer is any device that converts one form of energy
to another) are high impedance. This means that they can produce voltage but
very little current. To compensate for this, a preamplifier has to be placed
very close to the transducer. This will usually be inside the body of the electro-acoustic
guitar. The preamp will run for ages on a 9 volt alkaline battery, but it is
worth remembering that if an electro-acoustic guitar, or other instrument with
a piezo transducer, sounds distorted, it is almost certainly the battery that
needs replacing, perhaps after a year or more of service.

David Mellor

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David Mellor