With BiG, SPL expands the series 500 product portfolio with a double-slot module for stereo stage processing. The frequency range which should be processed can be selected with the RANGE control, or it can be moved backwards or forwards on the stereo image with the STAGE control. The huge BIGNESS control adjusts the intensity of the processing. Another highlight is the BASS function, which many users already know from the SPL IRON Mastering Compressor. This bass boost is created by a passive filter, which is implemented in a similar circuit to the AirBass function of the IRON. Also with BiG, SPL developed not only according to plan, but also by ear. All components are installed on the circuit boards using Through-hole technology, so that the best-sounding components can be used. Like all SPL devices, BiG is manufactured in the company's own production facility in Niederkrüchten on the Lower Rhine, Germany.