Dateq SPL 2 Mode D'emploi page 18

EN SPL2(TS) and SPL3(TS) user manual
Introduction
The SPL2, SPL2TS, SPL3 and SPL3TS are sound pressure limiters (SPL), especially designed for
use in public houses, discotheques, etc. The SPL-limiters are no peak-limiters, they only limit the
average sound pressure. Trimmers for on-site calibration are positioned behind removable
cover(plates) which can be put under seal.
The four different Dateq SPL-limiters form one family. The SPL2 and SPL2TS function without a
microphone, the SPL3 and SPL3TS use a special measuring microphone. The SPL2TS and SPL3TS
are supplied with a timer, able of setting the maximum sound level for certain periods of the day (see
table 1). Basically, all four types are identical. This manual covers all different types. Directions for
one specific type, are indicated with a logo in the left margin.
measuring microphone
timer
Table 1 : individual functions limiter types
Measuring microphone (advantages and disadvantages)
In some cases, authorities dictate the use of a measuring microphone. Also when using the limiter
with live-music, a measuring microphone will be essential. Using a measuring microphone can have
advantages and disadvantages.
• Calibrating the limiter usually takes place during the day, in an empty room. When this room fills
with a crowd during the night, acoustical damping will occur, so the maximum sound level will be
lower than the level set earlier. When making use of a microphone, the limiter will compensate for
this difference.
• Using a measuring microphone can be a disadvantage in smaller rooms, with relatively low
maximum sound levels (less than 100 dBA). In these situations, the crowd can easily drown 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.
SPL 2 SPL 2 TS
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SPL 3 SPL 3 TS
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Introduction 3