Speaker new-construction brackets are used in the rough-in phase of speaker installation. Designed for Russound’s 8” IC-Speakers and can be used with any brand’s 8” loudspeakers that have a 9.75” cutout size. This is the most common size for 8” speakers in general in the industry. The internal opening of the SB-C80 bracket is 9.875” with 1/8” extra so that an 8” speaker fits in easily.