Frye FP35 Manual

A SERVICE OF

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116 FONIX FP35 Hearing Aid Analyzer

5.2.5 Placing the Sound Field Speaker

The placement of the sound field speaker can have a big influence on the accu-

racy and repeatability of your real-ear measurements. Research has shown that

a consistent placement of 45 degrees azimuth to the client produces the most

repeatable testing results. Some clinicians, however, prefer to use the more tra-

ditional 0 degrees azimuth to the client. See Figure 5.2.1 for a diagram of a cli-

ent being tested at 45 degrees azimuth.

In both instances, we recommend a distance of 12–15 inches from the speaker

to the client. A larger distance might make the FP35 analyzer unable to produce

a 90 dB SPL signal to the client. A small distance might place the client in an

unstable place in the field of the speaker.

You can specify which azimuth you are using for your real-ear measurements.

This will have an effect on:

1. Which average REUR is used in creating SPL and insertion gain targets

(when the measured REUR has not been taken)

2. DSL LIN and DSL WDRC targets

3. NAL-NL1 targets

To set the position of the speaker:

4. Press [MENU] in any real-ear measurement screen or in the Audiogram

Entry screen.

5. Use [

∨, ∧] to select SOUND FIELD.

6. Use [<, >] to select 0º or 45º.

7. Press [EXIT] to return to the real-ear screen.

Notes:

• Ifyoutookyouraudiometricmeasurementswithasoundfieldspeaker,it

is recommended that you use the same azimuth for the real-ear measure-

ments as you used in the audiometric assessment.

• Thespeakerpositionissetwhenthesoundfieldisleveled.Ifyouwant

to change the speaker position after leveling, you must re-level the sound

field speaker for the change to take effect.

• Thelevelingstatuswillreflecttheselectedsoundfieldspeakerazimuth.

By default, this is set to 45º.

5.2.6 Leveling the Sound Field Speaker

The leveling process measures the sound field at the client’s ear, and accounts

for inconsistencies in the testing environment. It is essential for obtaining accu-

rate real-ear measurements. You must re-level the sound field for every client

and for every ear.