ASL’s solution began with the design and development of SIL2 rated matrix control and micro control products for LUL in 1993. From here, ASL then began developing its comprehensive PAVA and Long Line Public Address (LLPA) product ranges; adopting SIL2 standards for both hardware and software design. ASL pioneered the use of Adaptive Class D amplification with fanless cooling and DSP routing. These unique developments in voice alarm technolog

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