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Bosch LBB 1968/00 Plena Feedback Suppressor (Discontinued)
Part # F.01U.080.428
Model # LBB 1968/00
The Bosch LBB 1968/00 Plena Feedback Suppressor uses a powerful DSP with a patented algorithm to suppress acoustic feedback. It actively filters out unwanted room reverberations using an echo-cancellation and de-reverberation algorithm.

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Description

Details

The Plena feedback suppressor uses a powerful DSP with a patented algorithm to suppress acoustic feedback. It actively filters out unwanted room reverberations using an echo-cancellation and de-reverberation algorithm. By adding masked (inaudible) noise to the output signal or by shifting the frequency of the output signal by five hertz, the Plena feedback suppressor is able to detect the reverb component of the signal and remove it before feedback occurs. This leaves the original signal intact.

The adaptive filter can be switched between fast mode and accurate mode. The fast mode is for situations where the microphone position changes over time, such as in a discussion system with multiple switching microphones. The accurate mode is for situations with a fixed microphone position, such as on a pulpit where the acoustical environment is more stable. The adaptive filter is allowed to converge more slowly, suppressing reverberation components even more effectively. Depending on the acoustical environment and the chosen mode of operation, up to 12dB of additional gain is possible before acoustic feedback occurs.

The Plena feedback suppressor also features a built-in automatic mixer for the two microphone inputs. In many situations, such as on a rostrum, a pulpit or a conference table, two microphones are used to capture the voice of a moving speaker better, even though this increases the risk of acoustic feedback. To counter this, the automatic mixer in the Plena feedback suppressor reduces the gain of the microphone with the lowest signal input and increases the gain of the microphone with the highest signal input. This way, it tracks the moving speaker for optimum speech intelligibility, while maintaining a maximum feedback margin by keeping the combined gain constant. The automatic mixer function remains operational even when the feedback suppressor is deactivated.

Features

Features

  • Patented feedback suppression algorithm
  • Suppresses feedback before it occurs
  • Automatically adapts to the acoustical situation
  • Up to 12 dB additional gain before feedback occurs
  • Balanced line or microphone input with phantom supply
Specification
Mains Power Supply
Voltage230/115 VAC, ±10%, 50/60 Hz
Inrush current1.5 A @ 230 VAC / 3 A @ 115 VAC
Max power consumption50 VA
Performance
Sample rate (fs)32 kHz
Frequency response125 Hz to 15 kHz
Distortion<0.1 % @ 1 kHz
Gain (bypass mode)0 dB line in, 24 / 36 / 48 dB mic in
Gain (active mode)0 dB line in, 24 / 36 / 48 dB mic in
S/N> 90 dB
Signal delay<11 ms
DecorrelatorFrequency shift, 5 Hz up Masked noise
Mic / Line Input
Connectors3-pin XLR, 5-pin DIN, balanced
Max level18 / 6 / -6 dBV line in,-18 / -30 / -42 dBV mic in
Max level18 / 6 / -6 dBV line in,-18 / -30 / -42 dBV mic in
Impedance10 kohm / 2 kohm (line / mic)
CMRR> 25 dB (50 Hz to 20 kHz)
Phantom power16 V (mic only, switchable)
Priority controlLoop through of pin 4 and 5 of DIN
Mic Input
Connectors3-pin XLR, 5-pin DIN, balanced
Max level-18 / -30 / -42 dBV
Impedance2 kohm
Phantom power16 V (switchable)
Priority controlLoop-through of pin 4 and 5 of DIN
Line Input
ConnectorCinch, unbalanced
Max input level18 / 6 / -6 dBV
Impedance20 kohm
Line Output
Connector3-pin XLR, balanced
Max level18 / 6 / -6 dBV (line in),6 dBV (mic in)
Impedance<100 ohm
Line Output
ConnectorCinch, unbalanced
Max level18 / 6 / -6 dBV (line in),6 dBV (mic in)
Impedance<100 ohm
Mic output
Connector5-pin DIN, balanced
Max level22 / -34 / -46 dBV (line in), 34 dBV (mic in)
Impedance<100 ohm
Priority controlLoop-through of pins 4 and 5 of DIN from inputs
Environmental
Operating temperature-10 ºC to +55 ºC (14 ºF to +131 ºF)
Storage temperature-40 ºC to +70 ºC (-40 ºF to +158 ºF)
Relative humidity<95%
ColorCharcoal
MountingStand-alone, 19” rack
Dimensions (H x W x D)2.20" (56 mm) x 16.92" (430 mm) x 10.63" (270 mm)
Weight3 kg (6.6 lbs)
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