SoundKontrols Bookshelf Speaker Isolator Platform are isolators designed especially for book shelf and center channel speakers. They will decouple your speakers from the surface they rest upon, resulting in a more pure, accurate tone. Low to mid frequencies within these speakers will be crisp and intelligible. In addition, the mid and high frequencies will be projected and will no longer lack the definition you desire. Rattles and resonances will be a thing of the past.