Turning ordinary objects into visual microphones at MIT.

Put on your headphones for this video - what are the implications of this?! Watch the video

Invisibilité acoustique

Kind of "invisibility cloak". The acoustic cloak developed by these researchers contains 120 aluminium cylinders 15 mm in diameter, surrounding a 22.5 cm cylinder. The position of each cylinder in the cloak has been obtained by using optimization techniques based on genetic algorithms (numerical algorithms which mimic Darwinian evolution).
http://www.uv.es/uvweb/college/en/news-release/first-experimental-tridimensional-device-acoustic-invisibility-has-been-designed-1285846070123/Noticia.html?id=1285875404982

Premier écouteur à base de graphène

Graphene has extremely low mass density and high mechanical strength, key qualities for efficient wide-frequency-response electrostatic audio speaker design. 

http://www.extremetech.com/electronics/150646-berkeley-creates-the-first-graphene-earphones-and-unsurprisingly-theyre-awesome

http://www.physics.berkeley.edu/research/zettl/projects/graphene_loudspeaker/speaker.html