Frye FONIX 7000 - Manual (Page 79)

Basic Sound Chamber Tests
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6. Use [F2] to select CRV 2.
7. Use [∧] to select a source level of 60 dB SPL.
8. Press [START] to run the second measurement. Press [STOP] when the mea-
surement has stabilized.
9. Use [F2] to select CRV 3.
10. Use [∧] to select a source level of 70 dB SPL.
11. Press [START] to run the third measurement. Press [STOP] when the mea-
surement has stabilized.
12. Use [F2] to select CRV 4.
13. Use [∧] to select a source level of 80 dB SPL.
14. Press [START] to run the fourth measurement. Press [STOP] when the mea-
surement has stabilized. You now have a family of curves.
Figure 3.4.3A—Family of curves. Notice how all the curves are on top of each other. This aid
has very little compression between 50 dB and 80 dB SPL.