To whom it may concern,
I am an audio engineer and in my line of work I come across many new products touted to be the next great thing. One of them is Golden Audio's "Ultra Tweeter." Since, from what I can tell, most of their products are the audio equivalent of snake oil and functionally do nothing to actually improve audio quality I generally ignore companies like this. However, their "Ultra Tweeter" is touted to actually broadcast in the microwave range. They claim this improved the audio quality of your stereo, but anyone with even a rudamentary knowledge of science can tell this is a bogus claim. I'll quote the description on their website:
"These remarkable speakers, sold in pairs, operate at extremely high frequencies -- much higher than the audio band - actually in the microwave band, above 1 Gigahertz (GHz). The Ultra Tweeters are connected to the output terminals of existing speakers with speaker cables - preferably light, flexible ones - since the Ultra Tweeters themselves are quite light. Ultra Tweeter principle of operation is very unconventional. They don't generate sound in the audio band, or even in the 20-100 KHz band like super-tweeters, but function in the Gigahertz frequency band (normally used for satellite and microwave communications). Ultra Tweeters organize and improve the energy flow in signal conductors as well as the internal wirings of speaker drivers, making the audio system perform more efficiently and synergistically."
Link to the website:
http://www.dhcones.com/otheracc.html
A couple of points of interest in their claims should be clarified. L band (20-cm radar long-band) is a portion of the microwave band of the electromagnetic spectrum ranging roughly from 0.39 to 1.55 GHz. It is used by some communications satellites, and by terrestrial Eureka 147 digital audio broadcasting (DAB). In the United States, the L band is held by the military for telemetry, thereby forcing digital radio to in-band on-channel (IBOC) solutions.
My question is simple. Since this "tweeter" is admitted by the manufacturer to broadcast in the microwave range, do they have an FCC license for the operation of this product? Secondly, despite their dubious claims that this could improve audio quality of a stereo system, this product is possibly infringing on military frequencies. Is there any circumstance that would ever be allowed in a commercial product? If this product does indeed broadcast in those frequencies then this is basically a crude jamming device ready at the fingertips of anyone who would amplify the signal. That concerns me very much.
I am very interested to know if Golden Audio has FCC permission to broadcast at those frequencies, and if not what action as a concerned citizen I can take to prevent possible harm from misuse of this product.
I can be contacted at the information provided below, or at this email address any time. Thank you for your time.
Regards,