Zoned pre power amplifier for PA System

Main Features:

1.Standard case design, 1U aluminum panel.
2.Amplifier type: Class D power amplifier circuit design, low loss with more than 90% amplification efficiency.
3.Digital: higher digital circuit integration, stability and green energy saving further significantly improved.
4.Small size: The use of highly integrated digital chip instead of the traditional transformer, smaller volume can be reduced to 1U panel, lighter weight.
5.Junction clarity: No traditional annular transformer produces high-frequency oscillation and common mode noise, and prevents the current noise brought by coupling, crosstalk and electromagnetic radiation. Meanwhile, the digital circuit has strong anti-interference.
6.Professional noise gate control output signal, to ensure the background music noise.
7.Intelligent power management function, automatically enter the standby state when there is no signal, standby power is less than 3W, ensure 7 x 24 hours uninterrupted work.
8.A total volume adjustment knob, unified control of all lines and microphone volume, two parameter equalization adjustment knob, used to adjust the high and low to improve sound quality.
9.Each route input volume, each microphone volume has an independent adjustment knob to control the volume.
10.With the switch to play MP3 function keys: including Bluetooth, radio, USB/SD card playback, small screen display playback status.
11.With MP3 player, can play U disk, SD card in the audio program, the maximum support 32G.
12.With FM radio function, can receive frequency 88-108MHz radio programs.
13.6 audio source input, including 3 standard line input interface, 3 standard microphone input interface.
14.1 audio output, can be looped to the next power amplifier audio input interface.
15.MIC3 has the highest priority. It automatically murmurs when the signal is input. The junction FET converts the priority to ensure that the signal is not distorted during the murmurs.
16.6-way partition key switch and indicator. When the partition is turned on, the partition indicator is on.
17.70V, 100V constant voltage output, 4-16Ω constant resistance output, CH1-CH6 six-way partition constant voltage output.
18.Working status real-time indicator, 5 signal indicators, 1 protection indicator, 1 distortion indicator, 1 power indicator.
19.Line safety work area protection, to ensure the output load in short circuit, overload and other bad environment work safely.
20.Perfect temperature protection function, when the machine temperature rises, the temperature servo circuit will accelerate the fan, the fan working noise is low.
21.Peak negative feedback protection, when the signal distortion, impact, or line voltage serious overvoltage, can effectively protect the power amplifier.
22.The cross timbre compensation circuit is integrated to correct the high frequency loss caused by the interline transformer, so that the signal spectrum curve on the line voltage is straight and the timbre is beautiful.
23.High octave bass cutting circuit, the use of low cutting technology with timbre compensation, in the case of no loss of sound quality to remove the safety risk of ultra-low frequency components, to ensure the safety of the booster system work.