i have here a motorola V3 mobile speaker and a jack from a old headphone. i want to make a mp3 portable speaker using a mobile speaker.but i'v tried it already but im not contented on the loudeness of it.i dont know if amplier can drive this thing or what.
so can anyone help me to this project??? 
how to its my school project pls help me.
his famous line: "You cannot change the laws of physics!"
Completely oblivious to the fact that faster than light warp speed travel was breaking the laws of physics. 
you were already given the exact same useful information in your other post on the exact same subject
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1286960655/0#0
this is why you do not multipost, if it was all in a single thread you could be done by now instead of wasting everyone's time with the same question over and over again