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Old Mar 20, 19, 1:00 am
Join Date: Jul 2008
Location: TPE LAS LHR
Programs: BA Meltdown Gold, OZ♦+ (flying BR/UA), WoH♦, HH♦. Gaming: Mlife Noir, TR7*
Posts: 4,456
Just a note - it's pretty much impossible that voice reproduction from a cell phone's speaker would travel through a wall more than a human voice, unless for some reason a frequency in the vocal range that is boosted on the phone happens to be in resonance with the wall.

The reason cell phone speakers often sound "shrill" is that manufacturers love to overboost the 3k-8k range in an attempt to create a richer tone for media playback, but that's certainly not the frequency that's going to be getting past walls. Meanwhile the lower frequencies on these cell phone speakers are absolutely terrible, often -20 or even -30dB off peak by 500Mhz.

Of course, if the walls are thin enough, anything's going to get through.
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