DO I use the 450Mw or the 1000MW setting?
I would suggest the 1000 MW setting. By starting at the 1000 MW setting the music will start off louder and you can adjust to fit your needs. If you were to accidentally switch to the 450 MW the volume would just be lowered. Starting off at the 450 MW and switching to the 1000 MW would be going from low to high volume [not too friendly on the ears].