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4 Installation SPL2(TS) and SPL3(TS) user manual EN
in one way: by reducing the music level. Especially at these moments, this is a totally unwanted
effect.
The measuring microphone of the SPL3 and SPL3
TS
can be bypassed, by means of the bypass-
switch behind the left cover, so experimenting with or without a microphone is possible. However in
bypass-mode, the SPL3 and SPL3
TS
cannot handle live-music.
Timer
A built-in timer can be very useful when the maximum allowed sound level varies
per day or time-of-day. For example during the earlier hours of the evening, a
higher level can be allowed than later in the evening or at night. The timer will
switch automatically to the preset maximum level. The SPL2TS and SPL3TS-
clock automatically switches between normal time and daylight savings time. The
timer divides each day in 3 Timeslots. The beginning and ending as well as the
maximum sound level of each timeslot can be set by software.
Using the SPL limiter
The limiting-algorithm is designed in such a way that the presence of the limiter action is difficult to
notice. Of course it is not recommended to cross the limiter threshold too often.
As soon as the threshold has been crossed more than 14 dB the OVERLOAD-LED will start to blink.
If normally operated, this situation will never occur.
Music-mode / Live mode
The SPL3/3
TS
-limiters can be operated in two modes: a music-mode, during which the limiter will be
a part of the audio-chain, and a live-mode especially for use with live-music, when musicians use
their own amplifiers, percussion, etc.
•
When signal is applied to the audio-input, the limiter will switch over into music-mode. The
DETECT-, REDUCTION- and OVERLOAD-LED's indicate the status of the limiter. When the
maximum level is exceeded, the audio-output will be reduced.
•
In case no signal is applied to the audio-input, and the measuring microphone measures a sound
level above the maximum allowed level, the limiter will switch over to live-mode. The WARNING-
and SANCTION-LED's indicate the status of the limiter. In live-mode, the SPL3/3
TS
becomes a
real "guard": because the limiter is not able to reduce the sound level in an active way, guarding
the sound level will be done with the aid of two logical outputs. The first output (WARNING) can
drive a LED or a lamp (via a solid-state-relay) to warn the musicians that the maximum level is
exceeded. The second output is meant for switching the mains supply of the amplifiers of the live-
band (via a solid-state-relay). If the WARNING-lamp will be ignored, the SPL3/3TS will sanction
by switching off the mains supply of the bands' amplifiers.