Bose Panaray MA12 Technische Grundlagen & Diskussion - Seite 8

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Of course, as with any engineering solution, the hang-and-tilt approach is not perfect. It has

its strengths and weaknesses as they relate to the goal of cost effectively satisfying the major

customer requirements. The details of these strengths and weaknesses are the subject of the

next section.

Strengths of the hang-and-tilt approach

strengths of a good hang-and-tilt system are that with it, excellent tonal balance,

consistent sound level, and speech intelligibility can be achieved. Moreover, because the

speakers are located up and out of the way, they rarely interfere with sightlines.

Over the years, Bose and others have developed a number of technological solutions

specifically designed to improve the quality of hang-and-tilt systems. For example, Panaray

LT speakers are designed with very narrow sound radiation patterns so that designers can

carefully aim them only onto audience areas and avoid reflective walls and ceilings that can

produce the excessive reverberation responsible for diminished speech intelligibility. These

speakers also exhibit a very sharp rolloff of sound outside their primary radiation angles,

making it easier to combine two or more in such a way that they exhibit a minimum of the

inter-speaker interference that can lead to dropouts in sound.

Similarly, the Bose Panaray 502

field of hang-and-tilt speakers because it delivers consistent coverage over substantially a full

range of frequencies using very natural sounding cone-type drivers in a very small package.

This speaker is used in literally thousands of venues around the world where customers say it

meets their needs elegantly and unobtrusively.

As a final example of the types of innovations that have led to better hang-and-tilt systems,

until very recently it was thought to be difficult or impossible to include control of the lower

frequencies in hang-and-tilt designs. This lack of control meant that bass sound waves were

more or less allowed to go anywhere within a venue, causing a lack of clarity in music and

some masking of speech (and therefore a reduction of speech intelligibility). Today solutions

exist to control bass frequencies in hang-and-tilt designs with very nearly the same degree of

precision as the higher frequencies, including a comprehensive technique developed by Bose.

These solutions, which employ advanced array theory, have led to noticeable improvements

in the sound quality of systems in which they have been used.

Weaknesses of the hang-and-tilt approach

hang-and-tilt approach also has some weaknesses. For example, the designer must

ensure that the sound radiation pattern from the speaker being considered is appropriate for

the purpose of covering the audience area. However, the choice of speakers is limited to only

a few, which differ according to their radiation patterns. It is purely coincidence and therefore

rare for the designer to find a perfect match between the available radiation patterns and the

audience area. In general, the speaker being considered will have more or less coverage than

what is needed.

Bose

MA12™ Modular Array: Technical Foundation & Discussion

A loudspeaker represents an important contribution to the

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