The SL-2.1R is a slim 2-way loudspeaker designed to be surface-mounted and disappear into the architectural surroundings. Its precision ribbon HF driver and two 4” long-excursion LF drivers resolve complex audio program with detail and clarity that does not seem possible from such a small package. The addition of an available SBC-110 ceiling mounted sub-woofer extends low frequency response to 34 Hz and increases maximum system SPL.