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4
Introduction
the music, when singing along. This will be detected by the microphone, and the limiter can
only react 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 SPL3TS 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 SPL3TS can not 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 precence 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 SPL3/3TS-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
SPL3/3TS 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.
SPL2(TS) and SPL3(TS) user manual
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