Of course we all know the Altec Lansing vintage coaxial speakers, you can visit their website to get a notion of these excelent speakers, look for example for the series 604 !
Take a look at: http://www.audioheritage.org/html/links/links.htm
Graphic of the 604 prime version
There are also other manufacturers to be mentioned here:
BTH coax speakers, made in Great Britain:
Germany coax speaker Eckmiller 1944
© PE1MMK Hans Hilberink 2000-2006 - last update:
Thanks to Mr. Green from Bangladesh for his kind cooperation.