Harman Kardon AVP-1 Owners Manual - Page 6

IN III NNE II III III NI I A variation of this method is especially helpful in rooms which are already fairly "dead" acoustically. Rather than using absorptive material in rooms like these, try using diffusion instead. Commercially built diffusers are available but large bookcases and irregularly shaped furniture will also serve the same purpose. They reflect sounds in a highly randomized way which effectively "scatters" the sound in all directions. Place the diffuser where you would otherwise place the absorptive material (using the "mirror trick"), to break up the first early reflections and scatter them randomly throughout the room. Commercially available fiberglass, foam and diffusion panels may not be aesthetically acceptable in many installations, particularly when the home theater room serves multiple purposes. all of these materials can be covered with acousticallytransparent cloth for design considerations. It is important that the cloth be acoustically transparent, however, or else the effectiveness of the absorptive material will be greatly reduced. The simplest test for this is to hold a large sample of the cloth in front of a speaker playing the pink noise found in Chapter 6 of the SOLUTIONS TO ROOM REFLECTIONS: Diffusion Loudspeaker 0 Diffuser Diffuser Listener Diffusive Materials: • "RPG" Brand Panels • Bookcase • Furniture figure 3A Absorption Loudspeaker a cNik\eck _c 0 Cietiectect Oth Absorptive Material p Absorptive Material Listener Absorptive Materials: • fiberglass • dense foam • draperies • stuffed chairs Find position for absorption by the "mirror" trick figure 3B 5