New SAC

Discover our new Station Audio Control (SAC)

The new standard for monitoring and surveillance of PA speaker networks.

Are you sure your speaker system is functioning properly?

The Station Audio Control (SAC) is specifically designed for monitoring and surveillance of PA speaker networks, for example at train stations, public buildings, stadiums, ... It allows the measurement of audio levels of both line inputs and amplifier outputs of amplifiers. Deviations from preset values are signaled and reported, for example to a server via an SNMP trap.

In addition, impedances of speaker networks are checked to see if they are still within the allowable range. Up to 4 speaker networks, plus associated amplifier inputs and outputs, can be connected. Impedance measurement ranges from 2Ω to 5000Ω.

During system installation, a calibration step of the speaker network should be performed. In this step, the impedance of the network is measured and stored as a reference value. With each subsequent measurement of the network, the result is compared to this reference value. A deviation of more than 10%, for example, is signaled (freely adjustable).

An automatic measurement of the impedance of the network can be performed, once a day and at a preset time; preferably at night, because then, for example, there is the least traffic on the tracks and platforms. Noise does not affect the outcome of the measurement.

During the measurement, the speaker network is tried 4 times at X second intervals. The measurement itself takes 1 second. The interval time X is adjustable from 5 to 60 seconds. If two or more of the 4 values differ from the stored (reference) value by more than 10%, the measurement is repeated. The interval time between repetitions is 30 seconds. The measurement is repeated a maximum of 3 times. If the deviation still exceeds the 10% limit, a message is sent and the measurement is stopped.

If the value is much too high (open connection) or much too low (short circuit), the message "TOO HIGH" or "TOO LOW" appears on the display after completion of the measurement. The web page shows this status with the values "high" or "low".

A second check performed by the device is whether the amplifier is still functioning properly. This proceeds as follows:

The call signal is received at line level on an XLR connector. It passes through the device via a loop-through circuit. This allows the device to detect if audio is "coming in." We follow the same procedure to check the output of the amplifier. It is verified that audio is present on the amplifier's output during a call message. If not, a message is sent. Similarly, if the amplifier output level deviates from the calibrated value, a message appears.

The status and audio movements of the four sources can be read on the device's display. It also provides a menu for adjusting settings. In addition, you can use a Web browser to log into the device to configure the system through five Web pages.

With a power failure battery and a solid Linux core, the SAC is virtually maintenance-free. Reliability guaranteed.

Would you like more info or want to test? Please contact us.

Dateq International.