I came on this site via StumbleUpon. But I'm not sure that it's an illusion rather just a really really well produced sound?

http://techtoggle.com/2009/03/auditory-illusion/

The virtual haircut/woman's voice is simply amazing. I tried it with headphones and this weekend, I'll try it out via QS8's. I wonder if the effect will be the same.

If you have headphones, by all means, check out the link.

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Denon 4520, EPIC80/500/VP180 Speakers