iPhone horn speakers - retro passive amplifier technology

some pics and links for old skool technology and iPhone

http://www.cultofmac.com/can-you-hear-me-now-check-out-this-sleek-bullhorn-for-your-iphone/91067

http://www.waybeta.com/news/7621/iphone-with-a-new-love-retro-big-horn-quotrecord-machinequot-_-fenda-speaker-news/

http://www.wired.com/gadgetlab/tag/iphone/page/2/

http://gadgetsteria.com/2010/10/21/38391/

and some other amplifier designs:
http://amateur-person.blogspot.com/2011/04/unique-speakers-for-iphone.html