You said:
but the more i give it the closer i get to the max and the closer i get to that the quicker i wear it out and fry it. the rule of thumb is to supply a sub with atleast 70-80% of it rms the closer you get to its rms the better it will sound. I currently have one sub with 170rms amp

I am asking:
Where did you get that rule of thumb?



How do you figure that giving it its RMS will make it sound better? How do you expect to constantly feed it 150 watts? When your volume is very low, are you still giving it 150 watts? When you volume is at 50%, are you still giving it 150 watts?