SA series v.2 is Paradigm's latest version of its Reference SA Series of in-wall/in-ceiling line. Included, are two new models, the SA-15R-SM and the SA-15R-30. Priced at $449 each, the SM is a single speaker system with stereo L/R inputs. It's suitable for smaller rooms, where a speaker pair would just take up too much space. Paradigm's proprietary Dual-Directional Soundfield is featured in this stereo/mono model, which generates dual-channel sound from just one speaker. The SA-15R-30 costs $549 each and includes a high-frequency PhaseArm plus a proprietary Guided Soundfield system. This exclusive Paradigm feature lets you navigate the sound throughout your room according to your needs and desires. Paradigm explains that the PhaseArm is positioned relative to the ceiling, to maximize both phase response and dispersion.