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Re: Out of curiosity

Posted by Donald North (M) on February 24, 2007 at 14:09:52

In Reply to: Re: Out of curiosity posted by thomdp on February 24, 2007 at 12:06:56:

Hi Dennis,

Thanks for the product suggestion. Yes, I'm the engineering director of AuraSound.

About the Lineaum dipole tweeter, there are some challenges with it:
1. Linaeum was purchased in the 90's by MYS who was a big supplier to Radio Shack and produced models for them using the Linaeum dipole and monopole tweeters. Later Aura Systems (parent to AuraSound at the time) bought MYS to get their sales. In the audio industry and among retail buyers and the buying public, whever we mention the Lineaum tweeter to people, they almost always respond "Oh, isn't that the Radio Shack tweeter?" Once a product gets branded as "the Radio Shack" product, it is very difficult, if not impossible, to get back a reputation as a "high end" product.
2. The dipole tweeter only went out to 10 kHz on axis. Off axis it went out to 14-15 kHz. We were able to improve the measured performance of the monopole some by changing the diaphragm material from a plastic film to silk fabric and magnet structure from ceramic to neodymium.
3. The dipole and monopole tweeters don't have the low-level resolution and detail ability like a good dome tweeter. I don't have a definitive answer why this is, but do have some ideas.
4. The original plastic film diaphragms were very photo sensitive and would distort when exposed to sunlight or even a flash light. This was a further motivation to change to the silk material for the monopole.

AuraSound's business focus these past few years has been OEM transducers and systems. Developing a profitable retail product business is not easy and a slow road. When the financial situation is appropriate I definitely want to look into developing new AuraSound branded systems and establish a dealer network.

Donald North

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