Well i have a 60 watt combo amp... line 6 flextone II... love the amp and the speaker blew... so i have a new speaker... 75 watts handling... 150 max... and i am down to the point where i need to figure out what polarity the black and white wires, coming from the amp are... and i dont have a polarity tester to figure it out... and i dont wanna blow my new speaker... or amp... so... my dad, whos an electrician... told me the black wire is "probably" positive... but i dont wanna risk the chance of blowing anything up... so help would be wonderful...
if it's only 1 speaker, you don't have to worry about polarity. ie, just connect one end to black and the other to white, you'll be fine.
In case you ever do need to wire up more than one speaker:
actually polarity differences between 2 speakers only really start to cause cancelation at lower frequencys. ie. 2 tweeters/upper mids wired opposite of each other = fine. 2 subs wired opposite = whered my sound go?!? (i've always been a car audio nut :P )