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The SPL5 is the enhanced version of the SPL3; the audio level is monitored by means of a microphone; the microcontroller continuously measures the microphone-level and attenuates the output level as much as necessary to keep the sound level below the given threshold.
The SPL-D2 is a sound-level display unit. This unit can be used as a stand-alone device, or it can be connected to the SPL5 limiter. The display is built-up with hi-efficiency bi-color LEDs, so that it is clearly readable from a distance.
The SPL2 is the basic version which guards the sound pressure level under all circumstances. It offers the most cost effective solution to your sound level problems. This limiter is recommended as 'the best' by an increasing number of professional sound system installers.
The SPL3 works just like the SPL2: the microcontroller continuously measures the input-level and attenuates the output level as much as necessary to keep the sound level below the given threshold.
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