A homemade speaker using a plastic cup, business card, wire, magnet and some Lego blocks,built this speaker from scratch,I was surprised of the quality of the sound.
http://josepino.com/circuits/?howto-speaker.jpc
During the seventies and eighties, either planned obsolescense, poor engineering, or shortsightedness caused speaker manufacterers to use a type of rubber surround for drivers that deteriorate with age.
http://www.instructables.com/id/How_to_Refoam_your_Woofer/
An extensive description of building a no-compromise loudspeaker system and what you bump into along the way. Drivers used are a Focal Audiom 13KX, a Scanspeak 18W8545 and a Focal TC120Tdx2. Joined together by the less common series-filter.
http://www.speakerbuilding.com/content/1044/
A homemade speaker using a plastic cup, business card, wire, magnet and some Lego blocks. I built this speaker from scratch; I was surprised of the quality of the sound.
http://www.josepino.com/other_projects/index?howto-speaker.jpc
Unity gain frequencies are about 4Hz and 63Hz with the pot 20k centred.
http://sound.westhost.com/project48.htm