5.1 CS128MH digital signal processing requirements
The CS128MH digital signal processing requirements are listed here:
Table 4: CS128MH general filtration, gain, and delay requirements
High-pass filter
Low-pass filter
Overall gain in dB
Polarity
Delay in ms
255Hz, 24 dB (4th
order L-R)
None
-4
Positive
If the CS128MH
vertical angle in yoke
is < +10 degrees, use a
0.5 msec delay. If the
CS128MH vertical
angle in yoke is ≥ +10
degrees, use 0.5 msec
delay
Table 5: CS128MH parametric equalization requirements
EQ frequency
Constant Q*
Constant bandwidth* EQ gain in dB
450Hz
4 Q
0.36 BW
0.51
+4
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 Dolby CP950 cinema processors use
constant-bandwidth parametric EQ filters.
Table 6: CS128MH limiter requirements
RMS limiting in Vrms
Attack time in ms
Release time in ms
Peak stop in Vpk
49
2
32
100Vpk
5.2 CS128LF signal processing requirements
The CS128LF digital signal processing requirements are listed here:
Table 7: CS128LF general filtration, gain, and delay requirements
High-pass filter
Low-pass filter
Overall gain in dB
Polarity
Delay in ms
35Hz, 24 dB (4th order
Butteworth)
255Hz, 24 dB (4th
order Linkwitz-Riley)
0
Positive
If the CS128MH
vertical angle in yoke
is < +10 degrees, use a
0.5 msec delay. If the
CS128MH vertical
angle in yoke is ≥ +10
degrees, no delay is
required.
CS128MH digital signal processing requirements
Dolby Speaker System 128 Owner's Manual
35
8800293 Issue 2
27 October 2021
