oticon Sumo XP, Fittings Manual

Page: 7 / 18

7
Fitting tips:
1) If clients complain that the sound
is harsh or distorted with PC, then try
one of the AGC options.
2) Changing from PC to either AGC
method will cause the MPO level to
decrease 3dB. Test if the new MPO
level is correct. You may need to
increase the level to maintain the
same loudness.
3) The release time for both AGCs is
fast so that the gain for subsequent
speech sounds is not unnecessarily
decreased.
Then Select Limiting Options
MPO Level
AGC fast + PC:
AGC fast + PC has a fast attack time
(5 ms.) which results in rapid gain
reduction, preventing distortion even
for quickly changing sounds.
PC
Peak clipping is the default MPO
limiting method for SUMO. This will
provide the client with the highest
possible output at every moment,
which many clients with profound
hearing losses prefer.
AGC slow + PC:
AGC slow + PC has a slow attack time
(90 ms.) which prevents brief sounds from
activating the output AGC circuit and
hence the sound reproduction is only
slightly modulated by the AGC. A more
natural sound reproduction may be
obtained.