freemate DA-275, Руководство пользователя

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[11]
3) If there is high pitched feedback
when the volume is set to normal
usage levels, adjust the distance of
headset boom between the
microphone head cap and your
mouth. The proper distance is one
inch apart from your mouth.
3. Adjustment of dip switch
( = Transmission level)
If the transmission volume is too big
or too low even though you did all
the above settings, it may be bad
telephone line condition or low
output of telephone transmission
level.
If the TX volume is too big, place
switch no.1 to “OFF” (factory set-
up) to decrease it.
If the TX volume is too low, please
switch no.1 to “ON” to increase it.
4. Adjustment of tone control
switch for all day long users with
telephone.
If you want to hear bass sound for
comfort, fix the control switch to the
right. If treble sound for clarity, fix it
to the left.