GCF8S is an 8" passive subwoofer for ceiling and in-wall installation, designed to work as low frequency extension to our GCF and GWF ceiling/in-wall speakers as well as our GF speakers. It features a built-in passive low-pass filter to be connected on the same line as the satellites without needing a DSP or a separate amplifier channel. Its discrete frameless grille design suits installation both in residential and commercial environments such as home theaters, hotels, retail shops, spa and gyms, bars and restaurants, corporate buildings. Available in black or white colour, the circular magnetic grille can also be painted to match any environment.