Sup
Did you know that...
Subwoofer refers to either a woofer, or a complete loudspeaker dedicated to the reproduction of
bass audio frequencies, typically from 150 Hz down to 20 Hz.  
    powered subwoofers    
In the case of a rotary woofer, it is
possible to reproduce frequencies down to 1 Hz.
 bye

This spammer passed the checks  :bad-words: ... However the way he posted the link is invalid. Note that posting link here is nearly useless because links posted into the site are visible only to registered users , not even the search boats can see them, so they are directed only to people of the site.  :mmmh: Maybe Andreas is interested in this subwoofer something (however I can make a BURP lower than 1 hz  :D )

P.S. Note that u'll get an "user doesn't exist if you reply to this message"

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It seems to me the person is passing a bit of information.

A Sub Woofer is a large speaker that can produce a bass note down to 20 hertz.
He is stating that a rotary speaker can play or go lower to make a sound although you can only feel it rather
hearing it below 20 hertz.

In most speaker cabinets that play music they have three speakers. A tweeter, midrange and woofer. They where known as a three way system to produce sound threw the audio spectrum. Then cam a Driver or speaker as you will known as a Sub Woofer to produce lower bass tones or notes.  :D

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But six left turns will get you around the block
and back in the driveway again.