Selenium D3500Ti-Nd, Mic-Mute Automatic Microphone Switch, Cerwin Vega VIS-153
Selenium D3500Ti-Nd High Frequency Driver
By Mark Amundson
With the quality going up and the cost going down on rare earth magnetic materials, more Low and High Frequency Drivers are employing Neodymium as the magnetic motor. The main advantages of Neodymium over conventional magnet materials like Ceramic (Ferrite) and Aluminum-Nickel-Cobalt (Alnico) are twice to five times the remnant magnetic flux, which is the force the voice coil repels against to move the air. By using Neodymium, speaker designers can proportionally shrink the size of the magnet pole faces and motor assembly. While the assembly size and some component costs also shrink, it is believed that the Neodymium material is more expensive; leading to an equivalent to slightly more expensive driver.
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