Telex SS-1002 - Manual (Page 7)

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13. Sidetone Trimmers - The sidetone trimmers adjust the level of the user’s own voice in the
headphones when using full-cushion headphones. When using the speaker or
open-ear style headphones, the sidetone trimmers are adjusted to eliminate the
user’s voice from the headphones or speaker. This helps to prevent feedback.
14. Balanced/Unbalanced Selector
Switch - This switch sets the intercom station for compatibility with either Audiocom
(balanced) or Clear-Com (unbalanced) intercom systems.
FIGURE 1. SS-1002/2002 Features