The 3" CornerFill is a 3" x 3" x 24" section of flat-cut Studiofoam acoustic absorber that is beneficial in two ways.
Aesthetically, it provides a smooth, clean edge against which to butt other acoustic wall treatments and acoustic foam bass traps for a more professional appearance. Size wise it is a terrific way to finish out 3" foam products.
Acoustically, it smoothes out the excess low frequency energy that congregates in room corners.
Long sections of flat-cut Studiofoam that give smooth, clean edges to butt up for 3" foam products for a more professional appearance