Russound ALTX2BLACK Volume Control for In-Ceiling Speakers, Black (Discontinued by Manufacturer) The Russound ALTX 2 & ALTX2D Makes Controlling The Volume Of Your In-Wall Or In-Ceiling Speakers A Simple Task Use Up To Eight Of These Stereo Volume Controls To Drive Up To Eight Pairs Of Speakers The Knob Has 11 Steps Of Volume, Plus An Off Position, Provides A Total Of 48 Db Attenuation