Operator’s Manual
DC1048 Integrated Audio Management
Page 45
Appendix II: Limiter Types and Setting Thresholds
Program Limiter and “D
-
Max” Limiter
The DC1048 has two levels of dynamic protection on its outputs – a traditional
program limiter, and a newly introduced “D-Max” limiter.
Program Limiter
High performance digital limiters are provided for each output with control over
attack time, release time and threshold parameters - see page 48 for details. This
level of control allows the user to balance the required subjective quality of the
limiter against the driver protection requirements. It does also mean that an
incorrectly set limiter may sound awful! In particular, as with all limiters, using
too fast an attack or release time will result in excessive low frequency distortion.
On the limiters screen in
ICORE
there is an option for automatic limiter time
constants. Use this option if you are unsure how to set the time constants
manually. XTA recommend the use of the automatic setting.
In this mode the time constants will be automatically set from the High-Pass filter
frequency according to the table below.
The time constants are set by the high pass filter frequency for that channel.
High Pass Filter
Auto Attack Time
Release Time
<10Hz – 31Hz
45mS
x16 (720mS)
31Hz – 63Hz
16mS
x16 (256mS)
63Hz – 125Hz
8mS
x16 (128mS)
125Hz – 250Hz
4mS
x16 (64mS)
250Hz – 500Hz
2mS
x16 (32mS)
500Hz - 1kHz
1mS
x16 (16mS)
1kHz – 2kHz
0.5mS
x16 (8mS)
2kHz – 32kHz
0.3mS
x16 (4mS)