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 The TEC Car Audio SPL-X system features a classy blue LCD display, with the option of being able to connect up to a computer and have the SPL score show on the computer monitor. A computer standard RS232 serial port is provided on the rear of the SPL-X (cable not supplied). A free PC software program is available which makes the connection between computer and SPL-X and displays both the Maximum and Current SPL levels one above the other, along with the type of sensor (probe) being used. The software is provided in English and is compatible with all current versions of Microsoft Windows™.
 A clear, bright blue LCD display shows which probe is attached, along with both the Current Level (shows ‘low-lev’ when the SPL is below the measurement threshold, as in the picture) and Max Level measured (Peak Hold). This can be quickly reset. A button press on ‘BATT’ shows the current voltage condition of the battery. A further press on ‘SPL’ returns the display to SPL readout.
 The SPL-X is a completely self-contained SPL measurement system that does not need a computer to function. It has its own display and all the data processing circuitry inside to make the SPL measurements. However, for those who would like to have the display show on a larger screen, the built-in RS232 interface provides a link to a PC. Along with a small software application, this allows the SPL data to be shown either on a laptop monitor or any size of external screen.
SPL-X rear panel connections
The sensors are connected, one at a time, to the MIC input at the rear of the SPL-X. This is a computer type network connector. A 2 metre cable is supplied.
An unplugable connector with three screw terminals allows wires for Remote On (12V), 12V+ and Ground to be connected.
The RS232 connector is also accessible from the rear.
Since the measurement range is very wide (from 75 to 185dB), two probes (microphones) are supplied. The SPL-X automatically calibrates to the correct probe. For very high SPL, a pressure sensor is used (shown being held in the photo opposite). Both are connected to the SPL-X using the supplied cable, also shown in the picture. The supplied accessory pack allows either probe to be positioned on to the window glass using a suction cup.
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