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Bell SMP QX Series Manual page 18

Power amplifier with digital audio management

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ESC (quit)
Out: A
Out: A
Low-A Level
Low-A Level
Level = 0.0dB
Level = 0.0dB
Default setting for LEVEL is 0.0dB. Range = -90dB....0dB.
In the given example, LEVEL of CHANNEL A was changed from 0.0dB to -6dB, using PM1.
LEVEL position is: post EQ - pre DSC - pre Limiter.
ESC (quit)
Out: A Low-A Limiter
Out: A Low-A Limiter
Thr= OFF
Thr= OFF
Rto=99:1
Rto=99:1
Default setting for the RMS Limiter is: Threshold = OFF / Ratio = 100:1
In the given example, Threshold of CHANNEL A was changed from OFF to 2.7dBu (via PM1)
Ratio was changed from 99:1 to 2:1 (via PM2)
Theshold Range is: -18dBu....2.7dBu, OFF
Ratio Range is: 2:1....100:1
Threshold
!
Sets the level in dBu above which the limiter begins to attenuate the input signal.
As soon as the limiter is ‚active', this will be indicated by the yellow LED.
Ratio: (Example) : Threshold Level = 0dBu , Input Level = 4dBu, Ratio = 2:1
In this example, the calculation is: ((Input Level - Threshold Level) : Ratio) + Threshold Level
= ((+ 4dBu - 0.0dBu) : 2) + 0.0dBu = 2dBu + 0.0dBu = +2dBu
This means, that at an input level of +4dBu, and output level of +2dBu is to be expected.
The performance of the RMS limiter is best shown in the PC software.
ESC (quit)
Out: A Low-A Limiter
Out: A Low-A Limiter
Att= 60ms Rel= 2.5s
Att= 60ms Rel= 2.5s
The default value of the RMS Limiter is: Attack = 60ms / Release = 2.5s
In the given example, attack time of CHANNEL A was changed from 60ms to 10ms.
Release Time was changed from 2.5s in 5s. Command via PM1 and PM2.
Attack Time Range: 5ms ....200ms
Release Time Range: 0.1s ....5.0s
Attack Time
Attack is defined as the time it takes the limiter to attenuate the signal gain by a defined value.
Release Time. Normally, this value will be defined at 20dB.
Out: A
Out: A
Low-A Level
Low-A Level
Enter
aLevel = 0.0dB
aLevel = 0.0dB
RMS Limiter
RMS Limiter
Out: A Low-A Limiter
Out: A Low-A Limiter
Enter
aThr= OFF
aThr= OFF
Rto=99:1
Rto=99:1
RMS Limiter
RMS Limiter
Out: A Low-A Limiter
Out: A Low-A Limiter
Enter
aAtt= 60ms Rel= 2.5s
aAtt= 60ms Rel= 2.5s
Level
Level
Out: A
Out: A
PM1
aLevel = -6.0dB
aLevel = -6.0dB
PM1
Out: A Low-A Limiter
Out: A Low-A Limiter
PM2
aThr= +2.7dBu
aThr= +2.7dBu
PM1
Out: A Low-A Limiter
Out: A Low-A Limiter
PM2
aAtt= 10ms Rel= 5s
aAtt= 10ms Rel= 5s
1.
18
Low-A Level
Low-A Level
ESC
ESC
Rto=2:1
Rto=2:1
ESC

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