PA Output, Speaker Output, Expansion Input /Output

Intercom Channels, Balanced Mode (SW2 set to BAL position) Output Level: 1 Vrms nominal

Input Impedance: 300 ohms

Bridging Impedance: greater than 10,000 ohms

Sidetone: -40 dB, 35 dB adjustable range Call Signaling:

Send: 20 kHz ±100 Hz, 0.5 Vrms ±10%

Receive: 20 kHz ±800 Hz, 100 mVrms Mic-Kill Frequency:

Send: 24 kHz ±300 Hz, 0.5 Vrms ±10%

Detect: 24 kHz ±800 Hz, 100 mVrms Noise Contribution: less than -70 dB

Common Mode Rejection Ratio: greater than 50 dB

Connector Type: One XLR-3M and XLR-3F pair, wired in parallel, for each channel Pin 1 Common

Pin 2 Intercom audio low and +24 VDC input Pin 3 Intercom audio high and +24 VDC input

Intercom Channel, Unbalanced Mode (SW2 set to UNBAL position) Output Level: 1 Vrms ±10%

Input Impedance: 150 ohms

Bridging Impedance: greater than 10,000 ohms Call Signaling:

Send: 11 ±3 VDC

Receive: 4 VDC minimum

Connector Type: One XLR-3M and XLR-3F pair, wired in parallel, for each channel Pin 1 Common

Pin 2 +24 VDC input

Pin 3 Intercom audio high

PA Output

Output Level: 235 mVrms nominal

Connector Type: 1/8-inch Stereo Phone Jack

Tip: PA output high

Ring: Not used

Sleeve: Common

Output Level: 0 dB nominal (1.0 Vrms)

Output Impedance: 1000 ohms nominal

Frequency Response: 200 Hz to 8 kHz +1/-3dB

Connector Type: RCA Phono Jack

Tip: Speaker output high

Sleeve: Common

Type: 2.0 mm stereo phone jack

Tip: Talk output

Ring: Listen input

Sleeve: Common