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The overriding question is whether unwanted sounds will be transmitted throughout an office environment due to the presence of a raised floor system. Laboratory and field tests conducted by Tate and many other organizations show that when using typical interior construction of either drywall partitions or demountable partitions with conventional suspended lay-in ceilings, the use of a Tate raised floor will not result in a perceptible loss of sound isolation from office to office. A Tate raised floor provides far greater sound isolation than is possible with standard wall systems and/or ceiling systems. The acoustical “weak link” within standard interior constructions will always be the walls and ceilings, due to their penetrations and or lower sound transmission performances.

What Quiet Offices Sound Like , October 2007, FacilitiesNet
A new tenant needs a soundmasking system that allows a large number of people to have conversations without interfering with one another. The building’s deck, however, is 30 feet above the floor, and the new tenant doesn’t want to use mechanical lifts and other equipment to install a soundmasking system that is incorporated into the ceiling and plenum. The tenant opts to install an access floor, putting a soundmasking system, as well as some other building equipment, below people’s feet. 
Modular Construction:  Separating Myth from Realty , September 2007, Boston Business Journal
Poor Acoustics: Significant product improvements have been made by some manufacturers to specifically address these issues. Flooring products have been designed specifically for the general office application and feature a composite steel and lightweight concrete design which performs very similarly to composite structural slabs. Floor products in the general office environment are also mechanically fastened to the understructure for a more solid feel underfoot. 

Raised Access Floors and Office Acoustics, March 2004, Buildings Magazine, Article
"Tate, the leader in raised-access floors, and Dynasound, the leader in soundmasking solutions, have collaborated to create a white paper on acoustical issues and raised flooring."

Complete White Paper 3 MB