HighTones2 Diffusers can easily be mounted on walls or ceilings. They can be concealed under a stretch fabric system, painted or displayed in many beautiful hardwood finishes. Stand-alone units also fit into standard drop-ceiling systems. HighTones2 are available as single 2 x 2 ft units to tame first order reflections, or as monolithic coverings to add more aural “openness” to the space.