Westone Fitting Ranges for Vents & Sound Bores

The following examples of fitting ranges should be used as guidelines only. Any acoustic modifications to the earpiece and the response of the specific hearing instrument must be considered.

Fitting range 1
When tubed through to the end of the canal, the constant diameter sound bore will not increase highs.
Fitting range 2
A large bore, CFA or Libby Horn increases highs 8 to 12 dB from 2 to 5 kHz. Use a MVP system to alter perceived low frequencies.
Fitting range 3
A non-occluded or acoustic modifier style earpiece increases highs in "ski slope" losses. Use a MVP system to alter perceived low frequencies.

Fitting range 4
A 1mm small bore or a CFA reverse curve adapter decreases high frequencies. A pressure vent is the only vent recommended with this loss.
Fitting range 5
Uses a standard bore and regular tube. A pressure release vent is recommended to avoid feedback.