I revise this.
The difference is "night and day" in sound response. Just heard "In the air tonight" by Phil Collins on the radio today - nothing at all like stock sound response with radio (which is especially muffled compared to CD), with my new set-up.
If turning your volume up past a certain point results in anything but *better feelings*, this mod will turn it to gold with no cost. If you're leasing, sorry - for this and other things.