Clear-Com i-Series Panels - Manual (Page 82)

Hot Microphone Output
Type Transformer Balanced
Output Impedance 600 Ohms
Level 0 dBu nominal
Frequency Response 50 Hz to 15 kHz, ± 2 dB
Connector 3-pin XLR male
Speaker Feed Output
Impedance 4 to 8 Ohms
Power 1/2 watt at 4 Ohms
Connector mini-phone
Relay Output
Two relay outputs
SPDT
Contact Rating
30 VDC at 1 ampere
Connector DB-25 female
GPI Input
Two GPI inputs
Connector
DB-25 female
82 I-Series Panels User Guide