84 The DSL/NAL-NL1 Module WinCHAP User’s Manual
• Apply HL Corrections: Choose whether to apply NAL age-correcting HL val-
ues. It is recommended to select Yes for this setting.
• Channels: Select the number of channels that the aid has.
• Measured RECD: Select whether the RECD measurement was made with an
HA-1 coupler or with an HA-2 coupler. This is only used when an RECD is
measured.
• Tubing: Select the tubing used in a BTE fitting. This is used when creating
coupler targets.
• Venting: Select the venting used in the earmold or the body of the aid. This is
used when creating coupler targets.
6.6.3 Understanding DSL Settings
• Circuit Type: Select whether the aid is linear, WDRC-fixed, or WDRC-vari-
able.
• HL to SPL Transform: Select the transform to use when converting data from
dB HL to dB SPL. This affects the targets and the display of the audiometric
data in the SPL displays.
° Predicted: Uses the client age and selected transducer to predict the HL to
SPL transform. Note: there are no age correction factors for the TDH head
-
phones transducer type.
° RECD: Only available when a Transducer Type of ER3 Insert Earphone or
Insert Custom Mold is used.
° REUR: Only available when the Loudspeaker Transducer Type is select-
ed. It is assumed that the loudspeaker azimuth used for measurement of
the REUR is the same as the azimuth used for audiometric testing. You
must enter REUR values manually.
° REDD: When taking this measurement, use the transducer used for mea-
suring the audiometric values.
• RE to 2cc Transform: Choose whether to use an Average or Measured RECD
when creating coupler targets.
• Maximum Output: Choose whether the maximum output value uses the
Measured or Predicted upper limit values. The maximum output is not dis-
played, but it is used in the calculation of some values.
• Loudness Function: Factors the exponent values into compression targets.
DSL defines the exponent values as the “ratio of a normal hearing loudness
exponent to the hearing-impaired individual’s loudness exponent.” Only
available with WDRC-Variable circuit type. It is recommended to have a selec
-
tion of Predicted for this field.
