Bosch Feedback Suppressor View larger

Bosch Feedback Suppressor

LBB 1968/00

New product

Bosch 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. Provided with 3 year factory warranty. A must for any PA system.

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  • 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
  • Second microphone input with automatic mixer


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.

Operating Temperature-10°C to +55°C
MountingStand Alone, 19" rack
Weight3Kg
Dimensions56x430x270mm
Mic Output1
Line Output3
Line Input1
Mic Input1
Mic / Line Input1
Frequency Response125 Hz to 15 KHz
Max Power Consumption50 VA
Inrush current1.5 A @ 230 VAC / 3 A @ 115 VAC
Voltage230/115 VAC ±10%, 50/60 Hz

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Bosch Feedback Suppressor

Bosch Feedback Suppressor

Bosch 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. Provided with 3 year factory warranty. A must for any PA system.

Bosch Logo

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