Just imagine powerful subliminal messages recorded at high frequencies that are not masked by music or any other sound but are essentially inaudible to your conscious mind! Play them anywhere, anytime while driving, eating, watching TV, even while you sleep.
Now you can experience the latest achievement in subliminal technology!

A Revolutionary Approach to Subliminal Technology

We we’re so impressed by this powerful, new way to record subliminal messages, we contacted its creator, aerospace engineer O.M. Lowery, to find out how and why his encoding method is such an important step into 21st century brain/mind technology.

Lowery explained that he designed his patented process to overcome the deficiencies found in many “masked” subliminals which completely bury all voice affirmations. (The subliminals developed by WBLI are recorded at higher decibel levels which do not completely mask our messages).
Although inaudible to the conscious mind, the Silent Subliminal signals are powerfully perceived by the listener’s unconscious mind.
The Silent Subliminal process records voice affirmations on a powerful, inaudible, ultra high audio frequency carrier (14.8 khz) in a format which is easily picked up and decoded by the human ear. The encoded voice affirmations actually vibrate the tympanic membrane (diaphragm) of the ear at the strongest possible, yet totally safe, level.more
Here is a good story about all of this from the PPJGazette :

Silent Sound Spread Spectrum (SSSS) & the All-Digital TV Broadcast Signal: Connection?

Ever since first hearing of it last spring, I’ve had a deepening sense of foreboding – an unnamed dread of the upcoming shift to an all-digital television broadcast signal, scheduled to occur in February 2009. Now, I believe, that nameless dread may have a name, after all.
The Department of Defense calls it Silent Sound Spread Spectrum (SSSS), and it also goes by the name of S-quad or Squad. In the private sector, the technology goes by the name of Silent Subliminal Presentation System and the technology has also been released to certain corporate vendors who have attached catchy brand names like BrainSpeak Silent Subliminals to their own SSSS-based products.
Whatever you call it, SSSS is a technology that uses subliminal programming that is carried over Ultra-High Frequency (UHF) broadcast waves, planting inaudible messages directly into the subconscious human mind.
Perfected more than twenty years ago by the Department of Defense and battlefield-tested upon unwitting Iraqi soldiers serving in the army of Saddam Hussein in the Gulf War during 1991, SSSS is a sinister weapon that may have been been developed for a specific mission: the total subjugation of the American people.
more here