dBu is an absolute measurement. 0dBu is referenced to 0.775 volts RMS
Microphone Pre-Amplifier
Mic to Line (without limiter acting)
Frequency Response: 280 – 15k Hz ± 3dB
Microphone output to line – Audio Level (-50dBm Electret input): -9dBm
Microphone output to line –Distortion: <0.1%
Microphone output to line –Signal to Noise: >65dB
Clear-Com Sound: Yes
Headphone Amplifier
Frequency Response – Line to Headphone: 150 – 20kHz ± 3dB
Headphone input from line – Audio Level (-9dBm Electret input): 7dBm
Headphone input from line –Distortion: <0.5%
Headphone input from line – Signal to Noise: >50dB
Earphone to Mic – Crosstalk: >80dB
Sidetone – Adjustment Range (-80db mic input): >45dB
Keypad Indicators
Power: Green LED
Talk A and B: Green LED
Call A and B: Orange LED
Connectors
Intercom Line: (2) 3-pin XLR–M–F
Pin 1: Common
Pin 2: Power (+28V DC)/PL Ch-A
Pin 3: PL Ch-B
Headset: 4-pin XLR–M
Pin 1: Mic - (Mic Common)
Pin 2: Mic +
Pin 3: Spkr-
Pin 4: Spkr+ (and 0.5*VCC DC, supply between Pin 4 and Pin 1)
Program Audio Input: 3.5mm TRS Mini-Jack. Balanced Mono Input
Power
Input Voltage Range: 12-30V DC
Input Current (Idle): <=25mA
Input Current (Max): <=40mA
Call Voltage
16.5V DC
Minimum Voltage Needed: 3.3V
Environmental
32° - 158°F (0°- 70°C)
Dimensions
3.4 x 4.5 x 1.7in (HxWxD)
(86 x 114 x 43mm)
Weight
10.8oz (0.31kg)