Functional characteristics
1.1.5U machine, by audio processor part, digital power amplifier part and dual mode wireless microphone receiver (optional) integrated design, no external receiver box, pure embedded design.
2.4+1 microphone input, 3 hanging mics, 1 cannon interface to connect desktop mics, 1 wireless mics (optional), with 48V phantom power supply, and the power supply can be independently turned off.
3. Each microphone has an independent sensitivity adjustment, which can be 0dB-70dB volume adjustment and has an indicator for decibel number display.
4. Desktop microphone priority, when the desktop microphone has input, automatically turn off the microphone, courseware input, so that the recorded sound is clear, desktop microphone has an independent power switch, can realize the switch freedom.
5. With a separate microphone mute function, can be connected to the external mute switch panel, place the platform, convenient for teachers to operate in class.
6. At the same time, it supports the sound amplification of hanging wheat, wireless wheat (optional), desktop wheat and courseware, and the sound amplification is not screaming, no word loss, no lag, and the sound field is uniform. Drop microphone pickup range 5-10 meters, can cover the entire podium area.
7. Audio input There are two sets of stereo input, recording audio output, stereo output. Music on automatically turns off the microphone. The fourth microphone priority function.
8. The LCD on the front panel displays all parameters. All parameters can be locked to prevent misoperations.
9. Using adaptive environmental whistling suppression algorithm (AFC), can quickly and automatically eliminate whistling, feedback suppression (AFC) : sound transmission gain increase: ≥12dB background noise (ANS). The signal-to-noise ratio can be improved by 18dB
10. System Intelligence (AGC) bidirectional level control technology can achieve clear, continuous output without significant fluctuation of voice level. Prevent breaking your voice when you suddenly speak loudly or read in unison.
11. Built-in digital pressure limiter, can prevent sudden loud pressure damage to the speaker.
12. Built-in digital noise gate with multi-level threshold adjustment. The built-in background noise reduction function can automatically detect and effectively filter out the noise interference from air conditioners and electric fans in the classroom, and the filtering noise does not affect the sound reinforcement effect.
13. Built-in conversion DSP processor, 48KHz high-speed sampling, using high-speed floating point arithmetic. Built-in 24Bit A/D, D/A conversion; With high-low pass, 10-stage digital balance, accurate adjustment of sound field balance compensation.
14. Debugging control interface: support serial port and USB debugging; The Settings can be adjusted through the PC interface. The PC interface can be set to administrator mode and ordinary user mode. The total volume of the microphone can be adjusted (-80~0DB). The total volume of music can be adjusted (-80~0DB).
15. Support central control. RS-232 control;
16. The host adopts pure copper ring transformer power supply, AB class discrete component power amplifier to ensure sound fidelity, with delay protection, midpoint voltage protection, short-circuit overcurrent protection functions, with cooling fan. The output power of the power amplifier is 2*150W, and a host can have up to 4 pairs of speakers
Technical parameter
Microphone power supply: 48V phantom power
Microphone input level: -57dBu -- -12dBu
Microphone input: 3 channels, Canon connector
Audio input: RCA stereo input 2 sets
Recording output: RCA stereo output 2 sets
Control interface: RS-232 interface 1, USB interface 1
Power: 2X150W/ 8Ω, 180W/4Ω
Power amplifier input sensitivity: 0.775V
Frequency response: (through frequency response 30Hz to 20kHz. Feedback suppression frequency response 50Hz to 16KHz) +/- 1dB
Line: 20Hz -- 20KHz
SNR: ≥100Db(not counted)
Sound transmission gain: 8-12dB
Background noise reduction: Increase the system signal ratio ≥18dB
Automatic gain control range: -12dB -- +12dB
Power supply: AC185-235V50/60Hz
Volume: (W X D X H) 480*280*75MM
Gross weight: 7.7KG
