Frye FONIX 7000 - Manual (Page 89)

Basic Sound Chamber Tests
81
Speaker Placement
The speaker in the 7000 sound chamber is positioned on the right side of the
chamber at a 45º angle, as illustrated in Figure 3.4.11A. It is important to keep
this in mind when positioning the directional hearing aid for measurements.
Figure 3.4.11A—7000 sound chamber speaker placement
Forward measurement
The first step in doing a directional test is to position the hearing aid in the
sound chamber so that the front of the hearing aid is pointing towards the right
side of the chamber. See Figure 3.4.11B. Close the sound chamber lid and per-
form the following steps:
1. Enter the Coupler Multicurve screen by pressing [F1] from the Opening
screen.
2. Use [F5] to set the source type to Digital Speech.
3. Use [∨, ∧] to set the source amplitude to 50 dB SPL.
4. Press [START]. After the measurement has stabilized, press [STOP]. The
measured curve is the “forward” measurement of the directional test.