Full automatic professional conference feedback suppressor (two in and one out)

AVA-8710

product description:
TheAVA8710 adaptive filter can be switched between "fast" mode and "fine" mode. The Quick mode is suitable for applications where the microphone position is constantly changing, for example in a conference system with multiple microphones and switched over. The precise mode is suitable for applications where the microphone position is fixed, for example, where the acoustic environment is relatively stable. The adaptive filter can converge at a slower rate, thereby effectively suppressing more reflection components. Depending on the acoustic environment and the selected operating mode, an additional gain of up to 12 dB can be achieved before acoustic feedback occurs.

The feedback suppressor also incorporates an auto-mixer for two mic inputs. In many cases, such as at a podium, a pulpit, or a conference table, the use of two microphones can better capture the sound of a moving speaker, which often increases the risk of acoustic feedback. In view of this problem, the auto-mixer in the feedback suppressor will automatically reduce the gain of the microphone with the weak signal input and increase the gain of the other microphone with stronger signal input. In this way, it can track the speaker in motion, resulting in the best sound clarity. At the same time, since the total amount of the gain is kept constant, the maximum gain margin, which does not generate acoustic feedback, is maintained. The Auto Mixer function works even if the feedback suppressor is disabled.

TECHNICAL SPECIFICATIONS
AC power supply
• Voltage 230/115 VAC, ± 10%, 50/60 Hz
• Inrush Current 1.5 A, 230 VAC / 3 A, 115 VAC
• Maximum power consumption of 50 VA

Performance
The sampling rate (fs) is 32 kHz
• Frequency response from 125 Hz to 15 kHz
• Distortion <0.1% (at 1 kHz)
• Gain (bypass mode) 0 dB line input,
24/36/48 dB microphone input
• Gain (active mode) 0 dB Line input,
24/36/48 dB microphone input
• Signal to noise ratio> 90 dB
• Signal delay <11 ms
• The decoupler frequency shifts up to 5 Hz
• Shield noise
• One microphone / line input
• Connector 3-pin XLR, 5-pin DIN, balanced
• Maximum level 18/6 / -6 dBV Line input,
-18 / -30 / -42 dBV microphone input
• Impedance 10 kΩ / 2 k Ω(line / microphone)
CMRR> 25 dB (50 Hz to 20 kHz)
• Phantom power 16 V (microphone only, switchable)
• Priority control loop, DIN pins 4 and 5
• Microphone input: 1
• Connector 3-pin XLR, 5-pin DIN, balanced
• The maximum level is -18 / -30 / -42 dBV
• Impedance 2kΩ
• Phantom power supply 16 V (switchable)
• Priority control loop, DIN pins 4 and 5

Peripherals