Outputs
AC:
2 x 2 mono jacks, 6.3 mm (1/4 inch)
BC:
1 x mono jack, 6.3 mm (1/4 inch)
SF power output:
3 x terminals,
3 x 40 W peak, 8
Ω
load
SF line output:
2 x 1.6 Vrms,
External inputs
CD/Analog line in:
0.2 to 2.0 Vrms, 10 k
Ω
, 1 stereo 3.5 mm (1/8 inch) jack
Talk Back microphone:
•
Electret microphone
•
Input voltage: 0.002 to 0.02 Vrms
•
Input resistance: 2.21 k
Ω
.
•
3.5 mm (1/8 inch) jack
USB 2.0 hub:
•
with 3 powered USB ports
24V DC power supply:
•
DC power, 2.5 mm
Stimulus presentation
Normal:
The signal is presented when the Stimulus Presentation button is activated.
Continuous ON:
The signal is interrupted when the Stimulus Presentation button is activated.
Pulse:
The signal is pulsed.
Pulse duration:
200 ms on and 200 ms off configurable
Bone conductor
Bone conductor output
The maximum speech output level from the bone conductor depends on the actual sensitivity of the vibrator. The actual
maximum output is therefore determined at the time of calibration. The actual maximum output level may be determ-
ined by the operator by simply increasing the output level until the attenuator setting no longer increases.
Additionally, Aurical Aud includes a feature which allows the operator to select the maximum output level from a bone
conductor. Using this feature, the maximum output may be set lower than the physically available output level (installation
option).
As the maximum available output level will result in significant distortion from the bone conductor, the specification
below limits the speech output level to 60 dBHL. Typical distortion levels (median values of a sample of bone conductor)
are indicated in the following table.
Total harmonic distortion (THD), %
Speech hearing level (dBHL) ->
60
50
40
30
Frequency below (Hz)
-
-
-
-
Aurical Aud
27
17 Technical specifications
