General

Installation of External Microphones (Optional)

The Voice Center Conference Phone has 3 built-in microphones for complete 360° coverage in areas up to 10 x 15 ft (3 x 4.5 m).

The Voice Center Conference Phone has RJ-22 input jacks for two external microphones to extend coverage in larger areas and to allow for irregular layouts. Voice Center External Microphones (Spracht catalog no. EM-101) are sold separately from the Voice Center Conference Phone. An EM-101 External Microphone comes with a 70 inch (1.8 m) cable with RJ-22 connector (same connector as used for telephone handsets).

To install an external microphone:

1. Plug the RJ-22 microphone connector into one of the two microphone connectors on the underside of the Conference Phone; the micro- phone connectors are labeled “EXTERNAL MIC.”

2. Place the external microphone at least 18 inches (0.5 m) from the Conference Phone and (if present) another external microphone. The diagrams below show some common arrangements for external microphones with the Conference Phone.

External microphone

Conference phone

Connection of an External Recording Device (Optional)

The Voice Center Conference Phone provides an RCA jack for connection of an external recording device (such as a tape recorder). This provides a convenient means to record a teleconference held with the Conference Phone, and to obtain the highest quality recording possible.

The connection for the external recording device is an audio RCA coaxial connector located on the underside of the Conference Phone.