RIGHT, Works like a charm on my 05 4.4. But there are additional volumn controls in the head unit that increase the output in 6 steps. Look and see if yours has the same option. Mine uses the 6 radio station buttons in Aux mode to increase the volumn.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….