Perfect Acoustic Absorption? Sounds like a bad idea.

I’ve been in anechoic chambers before an there’s an odd feeling of “something’s missing”. If you consider that our bodies become accustomed to all sorts of environmental conditions in normal life, when you take one completely away, you are instantly aware that 20% of your senses aren’t working.

http://motherboard.vice.com/read/physicists-achieve-perfect-acoustic-absorbtion

Microsoft gets into the act as well:

http://www.bksv.com/Home/NewsEvents/News/Microsoft_breaks_record.aspx?src=fnt