Plur

[gymwear5]

Gold ribbon Cocepts in the 80's used a somwhat similatar though - vertical oriented magnets left and right in front and behind the ribbon. Their real innovation was to use vapor deposition of gold on a Kevlar membrane to get the impedance high - very thin coating. 4 ohms over 8 feet of ribbon conductor.

[Borat]

Originally Posted by gymwear5

Gold ribbon Cocepts in the 80's used a somwhat similatar though - vertical oriented magnets left and right in front and behind the ribbon. Their real innovation was to use vapor deposition of gold on a Kevlar membrane to get the impedance high - very thin coating. 4 ohms over 8 feet of ribbon conductor.

if you can find a picture that would be appreciated.

[svenny]

Are the Bohlender Graebner Neo3 and 5 not using the same principle?

[audioquestM-40]

Ribbon loudspeaker - US Patent 5021613 Claims