Panasonic · KX-TG/TGF Series
Both the Equalizer and Noise Reduction features are activated simultaneously. The Equalizer clarifies voice, and Noise Reduction reduces background noise.
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To turn off the Equalizer during a call, press MENU, select 'Equalizer', and choose the off setting.
To turn off Noise Reduction during a call, press MENU, select 'Noise reduction off', and press SELECT.
If audio quality is poor, try turning off one or both features, especially if line quality is questionable.