Bose Panaray MA12 Technische fundering en discussie - Pagina 4

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INTRODUCTION

requirements for a sound system are diverse and cover the areas of acoustics,

USTOMER

architecture, operation and service. Some of the most important requirements include the

following:

- Customers value a system that has the right balance of low, mid and high frequencies –

what is called 'tonal balance'. Customers hear and complain about sound that is too

'boomy' or 'shrill' or 'sibilant', all examples of tonal balance problems.

- A system that plays at the right level is better than one that is too soft or too loud.

Customers routinely complain about both excessive sound levels or when the desired

impact can not be achieved because the system is unable to play loud enough.

- A system where the sound is perceived to come from the same direction as the action to

which it corresponds is better in many applications. When, for example, a talker is on

stage, a system whose sound is perceived to come from the stage is better than one

where the sound comes from above. Lack of eye-ear correspondence is disconcerting

and distracting.

- A system that delivers music with clarity, and speech with intelligibility, is better than

one where instruments are garbled and speech is hard to understand. No other single

customer requirement generates as many complaints as poor speech intelligibility. It

often impacts the fundamental purpose of a venue – the sermon or lecture at a house of

worship, or the announcement at the airport, for example.

- Customers are understandably concerned about the appearance of a sound system. They

usually value a system that blends into its environment, and is out of the way. And

when the system is visible, customers want it to be elegant yet unobtrusive.

- Finally, customers value a system that works reliably for long periods of time without

degradation or the need for service. But should a problem occur, they want prompt,

cost-effective service. No customer wants to shut down a facility in order to undertake

repairs.

These customer requirements exist on any given project to one degree or another. For

example, in a place of worship a customer might seek nearly ideal speech intelligibility. But

in another situation, the required speech intelligibility might be set lower – to meet a

government standard for an emergency announcement in a shopping mall, for example.

Therefore, the intensity of need in each dimension on a specific project must be determined

for each project.

Customer satisfaction occurs to the degree that the performance levels in these key areas of

customer requirements are met at a competitive cost. The better system is always the one that

meets customer requirements for the least cost.

The standard design approach for meeting these requirements is unofficially called the

'hang-and-tilt' approach. In this approach, speakers with controlled radiation patterns are

Bose

MA12™ Modular Array: Technical Foundation & Discussion

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