Universal speaker housing for the TCS 28mm round speaker included This simple closed design channels both the front and rear audio out the front of the speaker housing This housing should only be used in models with a closed upper shell such as ones with solid fan housings exhaust stacks etc Features . 1x UNIV SH2 C Speaker Surround. 1x 28mm Round WOWSpeaker. UNIV SH3 O Intermountain TCS 20mm Round Speaker Housing Assembly Specifications . Size 20mm