"Secret Chat" is a device which creates deliberate chat range for you.
Setup:
1) Choose the type of Secret Chat to use - Full sphere range or half sphere range.
2) Place Secret Chat on the middle of the table, area, room or so.
3) Activate Secret Chat with the dialog.
4) Type "/3 message" to talk.
Use Case 1(e.g. clubs, bars, dance floors):
* Prevents guests/attendants from messing up with messages at other table/area.
Use Case 2(e.g. apartments, houses, conference rooms):
* Prevents messages from leaking to the outside, upstairs, and/or the downstairs in the room.
Use Case 3(e.g. events, concerts):
* You can use Secret Chat like a loudspeaker.
If spherical range is not what you need, "SitChat" may be the product for you.
https://marketplace.secondlife.com/p/SitChat-Sit-and-Do-the-Secret-Communication/446255