The SL-1.1US is an ultra-slim 2-way loudspeaker designed to be surface-mounted flat on a wall and disappear into the architectural surroundings. It employs a 1” textile dome HF driver and a 4” long-excursion LF driver to yield a very smooth, neutral response for near-field applications. The addition of an available SBC-110 ceiling mounted sub-woofer extends low frequency response to 34 Hz and increases maximum system SPL.