Placing studio monitor speakers directly on a hard surface such as a desk or unpadded stand can result in vibration and surface coupling that affects the sound of your speakers. PreSonus ISPD-4 isolation pads eliminate this problem by acoustically isolating the speakers from the surface. The pads come in pairs that can be split into four halves, so you can use the entire pad, use half a pad for a small speaker, or separate the two halves and use both for extra width, such as with a horizontally placed speaker.