Active Audio SA100P, Руководство пользователя

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3.4 Cables
3.4 Cables
Cable lengths detailed in table 3 correspond to the maximum lengths recommended for the amplifier to column
cable
5
.
Cable length Wire diameter
<
300
m
1
.
5
mm
2
<
500
m
2
.
5
mm
2
Table 3: Wiring recommendations for StepArray columns.
For very long distances exceeding the maximum cable length mentioned in table 3 , please contact Active Audio.
•
3 channel columns need a 4 wire cable.
•
6 channel columns need a 7 wire cable.
3.5 Subwoofers
In cases where the StepArray system diffuses music, the sound fidelity will be better if a subwoofer and its associated
amplifier are added. This option is not necessary for installations aimed at vocal diffusion since the human voice
hardly has component frequencies in the bass range below 150 Hz.
The subwoofer signal is delivered by an UT26 processor fitted with the SUB option (see section 5.2 ).
Active Audio proposes subwoofers (SA12-SW and SA12-SWA) suitable for StepArray installations (see section
14.3 ).
4 Column positionning rules
When choosing a StepArray setup, the goals are:
• Ensuring proper SPL coverage,
• Delivering satisfying intelligibility of vocal messages,
• Avoiding echoes and feedback effects,
• Giving the feeling that the sound comes from the speaker.
The positioning of columns should follow a few basic rules:
• Use as few columns as possible: choose the column covering as much of the listening area at once.
• Add more columns only if necessary. Beware: intelligibility could be impaired if there are too many columns.
• Columns should be placed so as to obtain the most homogeneous sound level over the audience area.
• For complex cases, it is highly recommended to use CAD software which will take into account the acoustics
of the room. CAD tools are presented in section 7 .
5
These maximum cable lengths correspond to a sound level loss of 3dB.
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