Bosch Appliances installation manual XLA 3200 Installation Manual

XLA 3200 Installation Manual		EN 12
• Depending of the amount of reverberation in the	• To determine exactly were the edges of the listening
room and the sound shadow (people or objects in	area are in your situation, you have to carry out a
front of a listener who block the direct sound source),	practical test at the location were the loudspeaker
the speech intelligibility at the furthest positions may	array is installed. This is a job for an experienced
be low. In these situations, it is better to use more	listener with well-trained ears. To do so, put pink
loudspeaker arrays to split the listening area.	noise through the loudspeaker array. It is better to
• The side lines of the shapes of figure 2 and 3 are the	reduce the lower tones for this test, as they do not
–6dB points related to the sound pressure level on the	contribute to speech intelligibility. Walk around in the
00-axis.	listening area and listen to the high tones. The places
• To get the best speech intelligibility, define a listening	were the high tones decreases rapidly are the edges of
area where the 4kHz octave shape covers the whole	the listening area.
area.

Diagram 1: relation between listening area and loudspeaker array mounting height

Diagonal line meanings

B-line: maximum distance from loudspeaker array to last listener.

D-line: half-width listening plane at 1kHz

F-line: listening plane side length at 4kHz

C-line: listening plane length

E-line: half-width listening plane at 4kHz

A-line: minimum distance to listening plane

Bosch Security Systems January 2004