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Project News [message #27892 is a reply to message #27889] Thu, 25 March 2004 15:32 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17658
Registered: January 2001
Illuminati (33rd Degree)
Chris Rose at Eminence contacted me about this project and said that it is underway, full steam ahead. However, this effort has reached a point where it has become somewhat commercial, so I am moving the discussion to the π Speakers forum. Please look for announcements there.

Magnet structures [message #27893 is a reply to message #27891] Thu, 25 March 2004 15:42 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17658
Registered: January 2001
Illuminati (33rd Degree)

Here is an interesting document written by John Eargle that compares various magnet structures and what performance can be expected from them. A horn provides 10dB to 15dB gain and a similar reduction in distortion. But the geometry of the driver's magnetic flux can do that much or more where distortion is concerned.

Three magnetic structures are compared, each having physical symmetry, but each made with a different material or technology. One is an alnico magnet, the other a ferrite and the third is a ferrite magnet with a flux stabilization ring. So this shows what is gained by incorporating this structure. Each page is a high-resolution scanfile, so if your browser scales them down to a small size, you might right-click and save them to your local computers and print or view them with a paint program or image viewer.

http://www.pispeakers.com/SFG_page1.gif
http://www.pispeakers.com/SFG_page2.gif
http://www.pispeakers.com/SFG_page3.gif
B12 - Eminence requests that the driver formerly known as MAG12 be called the B12 instead [message #27967 is a reply to message #27874] Wed, 22 September 2004 21:50 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 17658
Registered: January 2001
Illuminati (33rd Degree)
Just a note to say that the Eminence flux-stabilized subwoofer project is to be known as the B12. Status of the project is shown at the links below.

  • MAG12 Subwoofer
  • Subwoofer project
  • Subwoofer project update
  • B12 Subwoofer Project Update
  • B12 status update

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