Clear-Com 4-Wire Adapter Board For KB and HB Series
Details
Clear-Com’s EB7-4W 4-Wire Option module can be added to the KB-702, KB-702GM, KB-701, and HB-702 products. This option allows the speaker or headset station to be operated over longer distances than are possible with a standard Clear-Com intercom line. This option can also be used to connect with fiber optic transmission equipment. The EB7-4W 4-Wire Option module connection is a transformer-isolated, audio-only connection and does not convey the call signal. The module also requires local powering.
Two-channel stations can have two separate 4-wire connections with this option. The Channel Switch on the front panel selects which channel is connected.
Specifications:
- Input Impedance: >=5K?
- Max Level before Clipping: >=10dB
- Output Impedance: <=600?
- AC Input Voltage Range: 14-20 VAC
- DC Input Voltage Range: 20-30 VDC
- Input Current (Max): <= 15mA (excluding KB/HB station current)
Clear-Com 4-Wire Adapter Board For KB and HB Series 
Service was great! Got a response to my question within 24 hours (next business day).
Customer support assisted me with a quest about rated amperage and this being a tax exempt purchase. Very helpful.
checkout was messy - shipping pricy...