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DA50: Recommended Settings for Softphones

Headset Receive Settings

Headset EQ Presets

This pull-down menu selects headset equalization presets to normalize the frequency response of the headset receiver. It should be set according to the following table to optimize the frequency response for different Plantronics headsets:

Headset EQ PresetHeadset Model NameHeadset Model Numbers
Preset 1No equilization applied 
Preset 2MirageH41, H41N
Preset 3SupraH51, H51N, H61, H61N
Preset 4TristarH81, H81N
Preset 5EncoreH91, H91N, H101, H101N
Preset 6DuoSetH141, H141N
Preset 7DuoProH171, H1711N

Receiving Volume

It is recommended that this is set to a comfortable listening level. Excessively loud settings should be avoided.

Bass, Treble, and Balance

Leaving these at the center position gives good results for most applications. Bass and Treble can be set to user preferences. Balance has no effect because the DA50 is not used with stereo headsets.

Headset Microphone (Sending) Settings

Headset EQ Presets

The pull down menu has four options, as defined in the table below. The settings determine the sending bandwidth, and also whether or not a local sidetone path is enabled in the headset. Sidetone, which is commonly implemented in telephone terminals, is local feedback of sound from the microphone to the receiver.

Mic EQ PresetEffects
Voice BandLow bandwidth; no sidetone
NoneHigh bandwidth; no sidetone
TelephonyLow bandwidth; sidetone present
EnhancedHigh bandwidth; no sidetone

The recommended settings for IP telephony applications are “Telephony” if a local sidetone path is required, and “Voice Band” if sidetone is not required. If the softphone terminal generates its own sidetone, the headset should be set to a mode which does not implement local sidetone.

The high bandwidth settings “None” and “Enhanced” have little benefit unless a wideband codec is in use (e.g. G.722, G.722.2, etc).

Mic Volume

The best performance is usually obtained with microphone volume settings close to maximum. Some softphone software includes an “Audio Tuning Wizard” or adaptive controls to set up microphone volume. Otherwise some trial and error on the part of the user will be necessary.

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