Bosch Application Note (Places Of Worship) En US 1886152203

User Manual: Bosch Application note (Places of worship) Plena Public Address Solutions

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Application Note | Plena

Plena Feedback Suppressor
Places of worship

The Plena Feedback Suppressor is an easy-to-use solution
for reducing acoustic feedback in places of worship. It uses a
DSP to suppress feedback by actively filtering out unwanted
room reverb. By shifting the frequency of the output signal
by 5 Hz or by adding inaudible noise to the output signal, it
detects the reverb component of a signal and removes it before feedback occurs. A built-in 2-input mixer allows two
microphones to be used to capture the voice of a moving
speaker without increasing the risk of acoustic feedback. It
does this by automatically reducing the gain of the microphone with the weakest signal and increasing the gain of the
microphone with the strongest signal, thus tracking the
moving speaker and optimizing speech intelligibility. The
feedback suppressor’s adaptive filter has a fast mode (for
where the microphone positions change over time) and an
accurate mode (for fixed microphone positions).

Communication you can rely on

House of worship:

This application note describes how the Plena Feedback
Suppressor overcomes potential acoustic feedback problems in houses of worship where typically several microphones are used, for example by the minister (or other religious leader) in the pulpit and alter, and another for the
choir.
Introduction:

In general, houses of worship are large rooms with hard
surfaces such as marble, concrete, exposed brick, tiled
walls and high ceilings. This type of environment is very
reverberant, and when loudspeakers are carefully positioned for adequate coverage, there is an increased risk of
feedback from any of the several microphones typically
used in this type of venue.

Application Note | Plena

Summary of requirements:

Easy set-up:

• Several fixed microphone positions
• No acoustic feedback
• Amplified sound should originate close to person
speaking
• Quality loudspeakers with speech intelligibility
and music reproduction

In common with all Plena equipment, the Plena Feedback
Suppressor is easy to set-up according to the ‘plug and play’
philosophy. The suppression process is completely automatic,
and does not require the manual setting up of unpredictable
filters to achieve perfect results. The LBC 3201/00 Loudspeaker is also easy to adjust for a specific coverage area by determining the appropriate mounting height using a chart supplied with the loudspeakers. This means that the complete
installation can be installed and functionally optimized without the need for specific expertise.

Solution:

The Plena Feedback Suppressor is an ideal solution for this
type of application. It suppresses feedback before it even occurs and automatically adapts itself to the difficult acoustical environment. In this example, the feedback suppressor
(5) is connected to the insertion sockets of a Plena Mixer
Amplifier (2), using a dual cinch-to-cinch cable. In this way,
the feedback suppression will be effective on the signals
from all microphones. Up to four microphones (items 3
and 4) can be connected to this mixer amplifier. If necessary, additional microphones can be connected using a
Plena Universal Preamplifier.

Configuration
LBB 1968/00
LBC 3201/00
LBC 1912/10
LBC 1949/00
LBC 2900/xx

Plena Feedback Suppressor
XLA 3201 90/60 W Line Arrays
Plena 180/120 W Mixer Amplifier
Gooseneck microphone
Dynamic hand-held microphone

:1x
:4x
:1x
:1x
:1x

(5)
(1)
(2)
(3)
(4)

Line array loudspeakers:

The LBC 3201/00 Line Array Loudspeakers (1) complete
the system. They can cover a large area and deliver highquality reproduction of both speech and song. The used
line array technology provide an uniform sound distribution throughout the entire listening area, so not too loud at
the front and no too quiet at the back. For a more extensive
listening area, additional loudspeakers connected to delay
units can be positioned further down the venue.

1

3
4

2

5

Bosch Security Systems
For more information please visit
www.boschsecuritysystems.com

Data subject to change without notice | Printed in The Netherlands | PA-EH-en-06_4998144561_01
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