- 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 Voltage 230/115 VAC, ±10%, 50/60 Hz Inrush current 1.5 A @ 230 VAC / 3 A @ 115 VAC Max power consumption 50 VA Performance Sample rate (fs) 32 kHz Frequency response 125 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 Decorrelator Frequency shift, 5 Hz up Masked noise Mic / Line Input Connectors 3-pin XLR, 5-pin DIN, balanced Max level 18 / 6 / -6 dBV line in,-18 / -30 / -42 dBV mic in Max level 18 / 6 / -6 dBV line in,-18 / -30 / -42 dBV mic in Impedance 10 kohm / 2 kohm (line / mic) CMRR > 25 dB (50 Hz to 20 kHz) Phantom power 16 V (mic only, switchable) Priority control Loop through of pin 4 and 5 of DIN Mic Input Connectors 3-pin XLR, 5-pin DIN, balanced Max level -18 / -30 / -42 dBV Impedance 2 kohm Phantom power 16 V (switchable) Priority control Loop-through of pin 4 and 5 of DIN Line Input Connector Cinch, unbalanced Max input level 18 / 6 / -6 dBV Impedance 20 kohm Line Output Connector 3-pin XLR, balanced Max level 18 / 6 / -6 dBV (line in),6 dBV (mic in) Impedance <100 ohm Line Output Connector Cinch, unbalanced Max level 18 / 6 / -6 dBV (line in),6 dBV (mic in) Impedance <100 ohm Mic output Connector 5-pin DIN, balanced Max level 22 / -34 / -46 dBV (line in), 34 dBV (mic in) Impedance <100 ohm Priority control Loop-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% Color Charcoal Mounting Stand-alone, 19” rack Dimensions (H x W x D) 2.20" (56 mm) x 16.92" (430 mm) x 10.63" (270 mm) Weight 3 kg (6.6 lbs) - Reviews
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