Table 8: CS128LF parametric equalization requirements
EQ frequency
Constant Q*
Constant bandwidth
EQ gain in dB
50Hz
2.87 Q
0.5 BW
0.67
2.5
120Hz
1.41 Q
1 BW
1.43
-4
215Hz
2 Q
0.71 BW
1.06
-4.5
Note: There are two principal implementations for parametric EQ filters in DSP processors. You need
to select either the Constant Q or Constant Bandwidth mode in your DSP user interface (UI). The DSP
UI may provide both Q or BW settings, or it may show only BW with no option to input or show Q. To
correctly match the intended performance of this Dolby product, confirm with your DSP manufacturer
as to which implementation is used. The Dolby CP850 and CP950 cinema processors use constant-
bandwidth parametric EQ filters.
Table 9: CS128LF limiter requirements
RMS limiting in Vrms
Attack time in ms
Release time in ms
Peak stop in Vpk
49
45
720
138Vpk
Dolby Speaker System 128 digital signal processing requirements
Dolby Speaker System 128 Owner's Manual
36
8800293 Issue 2
27 October 2021
