V1.22
Owners Manual SP20-Linex™
- 20 -
Threshold value and amplifier gain factor
When you use the amplifiers supplied by Sound Projects they have a gain of 32 dBu.
The gain factor of an amplifier is extremely important for the threshold value of the
limiter! In table 2.6, the limiter parameters are listed in case of amplifiers with a gain of
32 dBu. Furthermore the listed settings are only valid when the recommended amplifier
power (or higher) is used.
Attack and release
The attack and release settings of the limiter strongly depend on the type of sound material,
which is used. If not set correctly they degrade sound quality and proper limiter operation. The
effect of the limiter on music quality can be checked by a sound technician; by turning the
amplifiers low and turning the input signal up into limiting (some limiters have a special limiting
mode). As an example timescales are listed. They are however merely an example and might in
practice differ remarkable depending on the type of limiter and the program material!
Limiter settings example table
HF
MF
LF
Threshold
0dBu/31 VRMS
+3dBu/44 VRMS
+3dBu/44 VRMS
Ratio
INF : 1
10 : 1
10 : 1
Attack
Fast / 5 ms
Med / 25 ms
Slow / 50 ms
Release
Fast / 50 ms
Slow / 200 ms
Slow / 200 ms
table 5.7 Limiter settings example table
