Clear-Com HLI-FBS - Manual (Page 138)

5) Apply auto-nulling to the connected channel (either IC1 or IC2) on the DX210
basestation. Auto-nulling helps to reduce echo while talking on a two-wire audio
system. To apply auto-nulling:
a) Insert a pen or similar pointed object into the AUTO-NULL hole on the front
panel.
b) Press and hold AUTO-NULL for 2 seconds.
Note: Before applying auto-nulling, ensure that there are no open microphones on
the wired intercom. If users are wearing headsets, you must notify them of
the audio-sweep that precedes the application of auto-nulling.
6) Adjust the two-wire intercom receive and send levels (in / out levels), using the 2-W
INPUT and 2-W OUTPUT controls for the connected channel (IC1 or IC2) on the
DX210 basestation front panel. For more information, see your DX210
documentation.
Tip:
To optimize audio quality, you may also want to adjust the Audio Settings on the HMS-4X
Main Station. For more information, see 4.2 Configuring the Audio settings.
138 HelixNet Partyline User Guide