dBu is an absolute measurement. 0 dBu is referenced to 0.775 volts RMS

Microphone Pre-Amplifier

Mic to Line (without limiter acting)
Frequency Response: 280 – 15kHz � 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
Ch. 1 2-Wire

Intercom Channel

Pin 1: Common
Pin 2: PL Power (+28VDC)/PL
Ch-A
Pin 3: PL Ch-B
Headset: 4-pin XLR–M

Headset Connector

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 jack

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 1.7 in (HxWxD)
(86 x 114 x 43mm)

Weight

10.8oz (0.31kg)