Includes 4 Polk Audio Vanishing Series 265-LS In-Wall 3-Way Loudspeakers Speaker Dimensions: 20.8" Height, 8.8" Width, 3.75" Depth Cutout Dimensions: 19.18" Height, 7.25" Width Frequency Response: 28Hz - 33000Hz, Impedance: 8 ohms, Sensitivity: 91 dB Driver Complement: (1) 1" Tweeter, (2) 6.5" Mid/Woofer Includes 4 Polk Audio Vanishing Series 265-LS In-Wall 3-Way Loudspeakers. Enjoy extraordinary audio performance for your movies, music and TV shows with the Polk Vanishing Series 265-LS 3-Way Loudspeaker that disappears into your wall and yet delivers impactful, room filling sound. The in-wall speaker is equipped with dual 6.5" Dynamic Balance Drivers for clear, accurate mids and dynamic lows, and a 1" Ring-Radiator Tweeter for incredible imaging. With Polks Patented PowerPort Bass Technology, the speaker adds deep, rumbling bass to your audio, while minimizing unwanted resonances. On the front panel, it has a reflective room compensation control switch that allows you to digitally compensate for harsh reflective surfaces, such as smooth walls, glass windows, and hardwood floors, delivering smooth audio. The in-wall speaker can be paired with the Vanishing LS Series center channel and in-ceiling speakers and Polks traditional floor-standing and bookshelf stereo speakers, allowing you to build a complete home theater system The rotating cam stabilizing system offers a quick and easy installation, and the paintable wafer-thin Sheer-Grille makes the loudspeaker virtually indistinguishable from its surrounding. The speaker can also be mounted into new or existing constructions using the optional in-wall mounting brackets.