TDT RZ2 Manual page 553

System 3
6. To exit the
Example 1: Adding Speaker Calibration Attenuation
A user wishes to equilibrate the level of stimuli applied to two different loudspeakers.
Speaker #2 is 7.3 dB louder at the frequency of interest than speaker #1. This
example requires the use of two PA5 programmable attenuators.
To more directly compare thresholds measured with both loudspeakers, set the
BaseAtt parameter for speaker #1 to
speaker #2 to 7.3 dB, so that the signal level delivered for a given
same for both loudspeakers. Actual attenuation versus displayed levels is shown in
the following table.
0
120
Example 2: Multiple Signals of Varying Levels
The base attenuation feature is also useful when working with multiple signals of
varying levels. BaseAtt can be configured so the intensity of each signal input is
identical at 0.0 dB. When working with three signals 30, 34, and 36 dB SPL, the
BaseAtt parameters are set and the actual versus displayed value of attenuation are
shown in the table below.
This example requires three PA5 programmable attenuators.
UserOps
menu, press and release the ESC button again.
Speaker 1: BaseAtt=0
UserAtt
Display Actual
Value Attenuation
0
120
Input Signal BaseAtt
36 dB SPL 6.0 db
34 dB SPL 4.0 dB
30 dB SPL 0.0 dB
0.0 dB BaseAtt
and set the
Speaker 2: BaseAtt = 7.3
UserAtt
Display
Value
-7.3
0
112.7
Displayed Value Actual Attenuation
0 6
4 10
6 12
8 14
0 4
4 8
6 10
8 12
0 0
4 4
6 6
8 8
PA5 Programmable Attenuator
14-9
parameter for
UserAtt
is the
Actual
Attenuation
0
7.3
120