Audio Enhancement TLD100 - Manual (Page 14)

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About the feedback blocker
This is a function when a feedback loop is generated as the microphone is used in close proximity to a speaker.
An integrated filter is automatically selected according to the generated audio frequency, and reduces the uncomfortable
feedback loop.
This function is specified with the DIP switch. This function is set to OFF at default settings.
Note:
• This function is simplified and cannot fully remove the feedback loop. When the feedback loop is extremely large, this
function will work to mute all the audio outputs of this unit.