Debra Audio EST-12 Portable In-Ear Monitor System Demo and Review

Today, I'm taking a look at Debra Audio's EST-12 portable in-ear monitor system.

EST-12: https://debraaudio.com/product/112.html
Debra Audio IEM systems: https://debraaudio.com/monitoring_sys...

Specs:
RF carrier frequency range: 560~590MHz;
Total number of channels: 20
Frequency stability: 0.005%;
Effective working distance (optimal environment): ≥80 meters;
Audio compression and expansion: DSP digital audio
Audio sampling depth: 24bit, 48K
Audio frequency response: 60Hz~20KHz;
Dynamic range: 95 dB;
Audio signal-to-noise ratio: 120dB;
Total harmonic distortion: ≤0.8%,@1KHz;
Operating temperature range: -10℃~ +50℃;

RECEIVER TECHNICAL PARAMETERS
Receiver bandwidth: 560~590MHz(the actual version shall prevail)
Receiving mode: dual-channel, superheterodyne;
Image suppression: 45dBm;
Receiving sensitivity: less than -99dBm;
Frequency synchronization mode: FM;
Audio output: 1 stereo headphone output
Headphone output power: 80mW@16Ω;
Power supply: built-in 3.7V lithium battery;
can also support external power bank power supply
Normal working current: 130mA;
Battery use time: ≥6 hours;

TRANSMITTER TECHNICAL PARAMETERS
Carrier bandwidth: 560~590MHz
Oscillation mode: PLL frequency synthesis;
Transmit power: 10mW;
Carrier error: 0.005%;
Harmonic radiation: -32dBm;
Modulation mode: GFSK;
Frequency error: less than 10ppm
Stereo input interface: Ф3.5mm
Input impedance: 2.2KΩ;
Frequency setting: FM;
Power supply: built-in 3.7V lithium battery ;
It can also support external power bank power supply
Normal working current: 160mA;
Battery use time: ≥4 hours;

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