https://www.posetteforever.com/viewtopic.php?f=72&t=3116&p=38564#p38564
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tda42
Wednesday, 13 February 2008, 11:46 PM

Re: Ohayo, What Subwoofer In Your Country U Use?
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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