12 inc bas zvučnik u kućištu, okrenutom ka zadnjem panelu.
Raspona frekvencije od 40-400kHz pri imedansi od 4 ohm.
Konstantne snage 300W, dimezija 302x545x760 mm, težine 37.7 kg

The SI-X™ Series includes a range of full range systems from the SI-10X to the SI-15X plus three complimentary high power subwoofers for extended low frequency performance and increased SPL.

The SI-12BX is a 12" horn loaded subwoofer that gives you the lowest frequencies and the punch you need. The SI-12BX is available in black and white version.