The company's new AT-1 intelligent controller has been specially developed to work with the company's existing Sentry Mk2 noise control unit and provide a complete, integrated solution. Used on its own, the Sentry Mk2 creates an effective method of shutting down an audio system by isolating the mains supply when the volume exceeds a preset threshold. The AT-1 links between an audio system's mixer and amplifier, and monitors SPL readings from the Sentry Mk2. As the volume approaches a preset threshold, the AT-1 begins to reduce the signal level passing to the amplifier, thus automatically reducing the overall volume in the venue.
The greater the volume picked up by the Sentry's microphone, the harder the AT-1 works to reduce the signal level entering the amplifier, but without ever cutting the signal altogether. A band or DJ can give their normal performance and drive the audio system as hard as they wish without ever exceeding the preset volume or having the music cut off.
The AT-1 restricts the overall volume smoothly and transparently, say Formula Sound, and unlike conventional compressors or limiters, it does not affect the dynamic range of the music being played. Because the AT-1 is driven by the ambient SPL volume detected by the Sentry's microphone (rather than a line level source) it provides precise control over the output of the audio system. The unit is easy to install and automatically compensates for the changing levels of absorption which occur as an audience gradually fills up a venue. If, of course, a mobile system is not connected to the AT-1, the Sentry will still cut mains power if the permitted level is exceeded. This will, in turn, encourage visiting artists to connect their system to the AT-1.
This stereo unit is available in either a 19" 1RU package or wall-mounted version, and offers both quarter-inch jack and three-pin XLR audio connection options which may be used either balanced or unbalanced. Multiple AT-1 units can be driven from a single Sentry, thus allowing precise control over house systems and those of visiting bands or DJs.
(Lee Baldock)
