TRUE OR FALSE- In order for sound to be transmitted from a source to a destination, air molecules must be present.
- Sound waves propagate in exactly the same manner as light waves.
- The best way to reduce sound transmission between rooms in a building is to use acoustically absorbent materials.
- Even if two rooms are physically separated from one another, sound can still be transmitted between them.
ANSWERS
1. FALSE. Sound can be transmitted through water and solids.
2. FALSE. Sound requires a medium (such as air, water, solids, etc.) in order for transmission to occur; light waves don't require a medium.
3. FALSE. Absorbers are only effective in specific frequency ranges. They're also totally ineffective against structure-borne sound transmission.
4. TRUE. Flanking paths allow sound to be indirectly transmitted from one space to another through adjoining parts of the structure. Air ducts, plumbing, plenum spaces, and in certain circumstances, even cavities between isolation walls can create flanking paths for airborne or structure-borne sound transmission.
Sources: www.dow.com/immotus,www.acoustics.com
CORRECTION
In the August issue's New Products section, the lengths of DVIGear's Super High Resolution DVI and HDMI cables were listed incorrectly. The cables are available in lengths up to 20 meters (or 65.6 feet). Also, in the CEDIA products section, an incorrect photo was shown with Crestron's Isys i/O TPMC-CH Series touchpanel controllers.