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12
Operation
Threshold adjustment. The threshold-level is factory-set to 0dBm. As soon as the audio
input
level exceeds 0dBm, the limiter will reduce output level. In the case a mixing console is connected
to the limiter, it is desired that the level meters on the console will indicate "0 dB" at the point the
threshold is crossed. If the output level of the mixing console is different from 0dBm (775mV), the
threshold level can be re-adjusted. Adjust the threshold to the level that the detect LED is blinking
on the beat of the sound.
Sound Level adjustment. With this trimmer the maximum allowed sound pressure level for
the SPL3 and SPL3TS can be set. Apply signal to the input (preferably white noise), so that the
threshold will be crossed (DETECT and REDUCTION-LED are on). Adjust the SOUND LEVEL so
that sound level will be the maximum allowed level. The adjusted sound level is automatically also
the valid maximum sound level in live-mode. This means that the limiter can also be adjusted in
another way: apply signal (preferably white noise) to the microphone by means of an external
audio amplifier and speakers. Be sure that the maximum sound level is reached. Now adjust the
SOUND LEVEL trimmer so that the LIVE-WARNING-LED just starts blinking. Decreasing the
noise level only 1 dB should quiet the blinking LIVE-WARNING-LED eventually.
Threshold adjustment. The threshold-level is factory-set to 0dBm. As soon as the audio
input
level exceeds 0dBm, the limiter will reduce output level. In the case a mixing console is connected
to the limiter, it is desired that the level meters on the console will indicate "0 dB" at the point the
threshold is crossed. If the output level of the mixing console is different from 0dBm (775mV), the
threshold level can be re-adjusted.
It takes some time before the limiter settles itself after adjusting the SOUND-LEVEL or the
THRESHOLD-trimmer. Take this into account, when calibrating the limiter.
Bypass indication. This LED blinks if the limiter is switched in bypass-mode. This can be the
result of a pre-programmed bypass period in the SPL2TS/3TS, or a pressed bypass-switch
(behind the left front cover) in all limiters.
Detect indication. As soon as the input level exceeds the threshold level, the DETECT-LED
lights up.
Reduction indication. When the limiter needs to reduce its output level, the REDUCTION-
LED lights up.
Overload indication. As soon as the threshold is crossed more than 14dB, the SPL-limiter
can not guarantee the audio quality of its output. If the threshold is crossed more than 14dB, the
OVERLOAD-LED starts blinking.
WARNING-indication. In music mode, the DETECT/REDUCTION/OVERLOAD-LED's are
active, while in live mode, the WARNING/SANCTION-LED's are active. When the measuring
microphone detects a sound pressure level higher than the allowed maximum, the WARNING-
LED will blink. If this situation persists, the blinking will become more intense (increasing duty-
cycle). See figure below. An external lamp can be connected with the same indication (via a solid-
state-relay).
SANCTION-indication (live-mode). If the sound level remains exceeded, the blinking
WARNING-LED will light continuously. A few seconds after this, the SANCTION-LED will light,
and the current of the "Live mode OK"-pin will be switched off. This should be used to switch of
SPL2(TS) and SPL3(TS) user manual
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