The Definitive Technology UIW RLS II In-Wall Reference Line Source Speaker (each) pictured to the top right is the very best in-wall LCR speaker offered by Definitive Technology, so you will want to order three of them for installation as the front left, center channel, and front right home theater speakers. Each speaker features dual 6½" cast basket drivers and 6½" pressure-coupled bass radiators, and a 1" pure aluminum dome tweeter in an enclosed design. OPTIONAL rough in bracket sold separately.

The Definitive Technology UIW RSS II Reference in-ceiling/in-wall bipolar surround sound speaker (each) pictured to the bottom right utilizes two 4½" cast basket drivers with two 4½" pressure-coupled bass radiators, and two 1" pure aluminum dome tweeters. These are meant to be installed as as both the side/rear and back surrounds for a reference quality 7.1 channel home theater audio system. OPTIONAL rough in bracket sold separately.

The Definitive Technology IWSub Reference fully enclosed in-wall subwoofer (each) pictured bottom left features one 13 inch active subwoofer driver pressure coupled to one 13 inch Ultra Low Bass radiator. It was designed to be used together with the Definitive Technology SubAmp 600 Reference in-wall subwoofer amplifier which is not pictured and is packaged and sold separately.