HD Acoustic B-9 Microphone System
True Diversity reception (dual receiver circuits, two independent antennas) per channel; detachable antennas with BNC or equivalent connectors; metal housing; 19" rack-mountable (rack-mount accessories included).
Display: LCD showing frequency, group, battery level, and RF/AF signal levels.
Special features: Automatic power-off sensor; key lock / frequency lock functions.
Automatic clean channel scanning (Auto Scan/Auto Setup) to locate the frequency with the least interference; includes Squelch / Pilot Tone circuitry to eliminate noise and artifacts when the transmitter is turned off.
Automatic frequency synchronization from receiver to handheld microphone via Infrared (IR Sync), Bluetooth, or equivalent wireless method.
Transmission technology: UHF (Ultra High Frequency); PLL (Phase-Locked Loop) frequency synthesis; True Diversity receiver with dual antennas.

Operating frequency range: 470 – 694 MHz.
Technical standard: QCVN 91:2015 BTTTT.
Features automatic frequency scanning and locking (Auto Scan) to prevent signal interference; supports at least 14 simultaneous interference-free channels. Stable transmission/reception range of at least 100 m under standard room/auditorium conditions (line-of-sight, no metal obstructions).
Adjustable channels: 100 x 2 (1600 frequency options) with frequency synchronization from receiver to handheld microphone (IR Sync / ACT Sync).
Receiver scanning bandwidth: 40 MHz.
Frequency response: 50 Hz – 20 kHz.
Signal-to-noise ratio (S/N): ≥ 100 dB(A).
Total Harmonic Distortion (THD): ≤ 0.5%.
Frequency stability: ≤ ± 10 ppm or better (PLL synthesized).
Rugged, solid die-cast metal body.
Microphone capsule: Dynamic, Cardioid (unidirectional) polar pattern; high sensitivity, excellent voice pickup; integrated windscreen/filter to reduce noise and wind noise.
Power supply: 100-240V, 50-60 Hz, 12 VDC adapter (switching type).
Transmission power: 30 mW ERP.
Channel bandwidth: 200 kHz.
Power source: 2 x 1.5V batteries (up to 10 hours of continuous use with optimal batteries); battery level display on handheld microphone or receiver.
Outputs: Individual balanced XLR for each channel and a mixed 6.35mm jack output; metal housing; includes 19" rack-mount kit and power adapter.
Operating range: 100 – 120 meters (in ideal conditions).