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 Preset||Headset Model Name||Headset Model Numbers|
|Preset 1||No equilization applied|
|Preset 2||Mirage||H41, H41N|
|Preset 3||Supra||H51, H51N, H61, H61N|
|Preset 4||Tristar||H81, H81N|
|Preset 5||Encore||H91, H91N, H101, H101N|
|Preset 6||DuoSet||H141, H141N|
|Preset 7||DuoPro||H171, H1711N|
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 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 Preset||Effects|
|Voice Band||Low bandwidth; no sidetone|
|None||High bandwidth; no sidetone|
|Telephony||Low bandwidth; sidetone present|
|Enhanced||High 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).
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.