Setting The Options Switches - Bosch LBB 1968 Installation And Operating Manual

Plena Feedback Suppressor | Installation and Operating Manual |
3.2

Setting the options switches

Mic 1/Line In
Mic/Line
figure 3.6: Options switches
The Plena Feedback Suppressor is provided with four options switches (10):
table 3.3: Options switches
Switch number
1
2
3
4
Music mode/Speech mode
In the Speech mode (not recommended for music) up to 12 dB extra gain is possible, compared to the bypass mode,
before acoustic feedback occurs. The Speech mode (5 Hz frequency shift) is faster and more effective in feedback
suppression than the Music mode.
In the Music mode (recommended for music, but also suitable for speech) up to 6 dB extra gain is possible before
acoustic feedback occurs, depending on the acoustical environment.
Dual input Auto Mix mode
In this mode the Auto Mix function (see §1.1) is enabled.
Bass lift mode/Flat mode
Due to natural room reverb e.g. a speaker's voice will normally sound full and rich. As feedback suppression, using
the de-reverberation algorithm, filters and reduces the room reverb, this may cause the low frequency response of
the room to be less pronounced, especially in larger halls. The 'Bass lift' option is provided to correct this
phenomenon.
Bosch Security Systems | 2003-11 | 9922 141 81681en
Mic 2 In Line
In
On Off
Out
Phantom Mic 1+2
ON-position
Music mode
Dual input Auto Mix
(Mic 1 In + Mic. 2 In)
Bass lift mode
Accurate filter mode
External settings and connections
Line Out Switch On
1 Music mode
2 Dualinputvoicetracking
Mic1In + Mic2In
3 Process with bass lift
4 Accurate mode
High Med. Low
Signal Level
1 2 3 4
10
1 2 3 4
OFF-position
Speech mode
Single input
(Mic 1/Line in)
Flat mode
Fast filter mode
Off
Speech mode
115V~ 230V~
Single input
Mic2/Line In
Process flat
Fast mode
Apparatus delivered
LBB 1968/00 8900 196 80001
connected for 230V-
Plena Feedback Suppressor
115/230V~,50/60Hz
N663
Rated input
S/N.
Design & Quality Power: 50VA
The Netherlands
T500L250V
Warning
This apparatus must be earthed
Off
On
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