Hard surfaces reflect sound waves; soft materials absorb them. Materials that help control sound within a room are familiar to most homeowners--if you want to minimize sound bouncing around within a room, opt for "soft" materials such as acoustic ceilings and padded carpet rather than hardwood, tile and laminates.

Companies such as Armstrong World Industries have a wide range of acoustic ceiling materials.

Acoustic tiles and drop-ceiling systems offer excellent acoustic properties; people who think the conventional styles are a bit too institutional will like some of the newer varieties available.

For example, Armstrong offers 2-foot by 2-foot panels that have a step-edged detail or look like embossed or molded plaster.

"These are very good for blocking noise generated in the basement and keeping it from invading upstairs," says Scott Qualls, marketing manager of Armstrong's residential ceilings. "They will give your basement ceiling an STC of about 35, and even better performance if you install batt insulation between floor joist," he adds.

With ceilings as with the entire house, the most effective way to minimize noise is to combine several sound blocking and reduction methods.