I had a look at another Exchange question, and couldn't quite understand.

I have a set of cheap speakers, 8ohms each with a combined output of 6 watts.

If sqrt(6w/8Ω) = 0.866 v, and [the post](https://electronics.stackexchange.com/questions/100292/speaker-level-to-line-level) says line level is approximately 1 volt, what should my amperage be? 

How can I calculate for an appropriate resistor? 

I have about 10 150Ω resistors at home... will wiring them half and half between speakers attenuate the signal? How many do I need of each?

EDIT (CLARIFICATION): 

*I want to know how to calculate the resistance needed to reduce a powered signal (6w) to line level.*