Video advertisement fail:

Take a look at this video -

http://www.firebox.com/video/944

The sound is fake. And badly done so.

Because the frequency response of such a speaker changes with and without a surface it is in contact with. Yet it sounds the same when the speaker is lifted off, just softer.

Some alteration to the sound clip confirms this -

Original:

The soft part corrected to the same level:

It sounds the same.

And the other fail - the sound change came AFTER the person put down the speaker (instead of at the same time). I wouldn't have enough suspicion to try out this clip if not for this.

Actually, I believe most speaker video advertisements have fake sound, just that this one got caught red-handed.