Bose Panaray MA12 Технические основы и обсуждение - Страница 11

Просмотреть онлайн или скачать pdf Технические основы и обсуждение для Акустическая система Bose Panaray MA12. Bose Panaray MA12 36 страниц. Modular line array loudspeaker
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Figure 4. The interference zone caused by the overlap of two speakers

is shown. Inter-speaker interference can result in major sound dropouts

– as severe as 20-30 dB – which harms tonal balance, clarity, and

intelligibility.

For these reasons and others, hang-and-tilt systems require a significant investment in

design time to achieve good coverage without excessive interference. To aid in this effort, the

designs are usually created using computer modeling programs, where creating the room

model, then selecting, positioning, and aiming speakers, and optimizing the design can take

anywhere from a day to weeks, or even months in the case of large projects.

Once designed, sophisticated rigging is often needed to ensure that the speakers are

properly and attractively installed. A professional engineer is often employed to implement

the exact aiming angles dictated by the design and to ensure mechanical integrity and safety.

Then the rigging hardware has to be purchased or fabricated and shipped to the site. The

installation requires a lift or scaffolding to hang the speakers in the right place. And finally

the installation often has to be reviewed by the local engineer to ensure that it meets code and

safety requirements. Rigging and installation costs can climb into the thousands of dollars.

Once the system is installed, another significant investment in engineering time is required

for system tuning and adjustment. Level matching the low to the mid and high frequencies

and setting time delays in a cluster takes time and requires a skilled field engineer. So does

setting time delays and matching levels from cluster to cluster and deciding on the overall

room equalization.

Thus designing, installing, and tuning a hang-and tilt design is time consuming and requires

a high level of skill in a variety of areas. These factors mean that hang-and-tilt systems are

often expensive to create.

Hang-and-tilt systems also suffer from compromised performance in the area of sound

localization. The visual activity is usually to the front of the listener, but the sound comes

from above where the speakers are located. This lack of eye-ear correspondence is

Bose

MA12™ Modular Array: Technical Foundation & Discussion

Page 11 of 36