Settings
9.1 Amplifier settings: Output attenuation
The output attenuation screen sets the amplifier’s output
attenuation level.
The user can choose whether to set output attenuation for
channel 1, channel 2 or both by cycling through the right
most button. The “+” and “-” buttons change the value of the
output attenuation in the range from 0 to -30 dB. A single
“+” or “-” button press will increase or decrease the output
attenuation by 1 dB.
Note: for ideal sonic performance, select a 0 dB output at-
tenuation (meaning no attenuation), and select the proper
gain/sensitivity level as explained in the next paragraph.
9.2 Amplifier settings: Input Gain/
Sensitivity
All Bias Series amplifiers allow selection of input sensitiv-
ity to allow correct sensitivity matching with other third party
equipment.
The user can choose whether to set the input gain/sensitivity
for channel 1, channel 2 or both by cycling through the right
most button. The “+” and “-” buttons change the value of the
input gain and corresponding sensitivity. The allowed gain
values are 26 dB, 29 dB, 32 dB and 35 dB.
TABLE 3 shows the input sensitivity values for the Bias Series
amplifiers. These are the maximum RMS voltage values of a
Gain V3 V9
26 dB 5.30 V 7.37 V
29 dB 3.75 V 5.22 V
32 dB 2.66 V 3.68 V
35 dB 1.88 V 2.62 V
TABLE 3: Input sensitivity (in RMS volt) @ 1 kHz vs gain.
V3 V9
40/165 V 40/225 V
TABLE 5: Maximum output voltage (V
peak
).
Gain dBV dBu V
rms
26 dB 25.0 27 18
29 dB 21.6 24 12
32 dB 19.0 21 9
35 dB 15.6 18 6
TABLE 4: Maximum balanced input signal vs gain.
1 kHz sine wave input before clipping occurs at the output
stage. These values are reported with respect to the ampli-
fier’s gain.
9.3 Amplifier settings: Input select
Bias Series amplifiers allow the user to choose three different
input modes (if available): Analog, AES3
1
and/or
AESOP
2
.
Each of these inputs can either be processed by the internal
DSP (if installed) or not. The up and down buttons on the “Input
select” screen toggle between the available input sources.
The “sel” button locks the selected option.
The available signal routing path configurations are:
Analog Out
Analog input and direct output
Analog DSP Out
1
Analog input routed to the internal DSP
AES3 Out
AES3 input, direct output
AES3 DSP Out
1
AES3 input routed to the internal DSP
AESOP Out
2
AESOP input, direct output
AESOP DSP Out
1 2
AESOP input routed to the internal DSP
1
Available only with optional KDSP board
2
Available only with optional AESOP board
9.4 Amplifier settings: Max output volt-
age
The max output peak voltage of Bias Series amplifiers can be
set by the user.
It is possible to set output peak voltage levels for channel 1,
channel 2 or both by pressing the “C1+2” button. The “+” and
“-” buttons change the value of the max output peak voltage.
Available voltage ranges for each model are shown in TABLE
5.
The maximum balanced input signal before saturation of the
input stage of the amplifier occurs with respect to the ampli-
fier’s gain is presented in TABLE 4.
Output attenuation
back C1+2
-
+
-13 -13dB
FIGURE 21: Output attenuation.
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