Received the 7.25 and 5.25 for the Ultra Classic install this past weekend, pretty easy install, so I turned them up a little over 1/4 way and was not impressed sound loudness was about the same as orig speakers.
Had the orig up to 3/4 a little more and they sounded pretty good standing in my drive way. But put the J&M S 3/4 and the higher they were in volume, the better sounding they became ,turned them up 3/4 a little more and walked across the street MAN THESE SOUND GOOD,even had the neighbor 2 houses down comming out of his garage to see what the noise was about ,they are loud.
Took it for a putt and even the wife was not complaining about just hearing screaming from the speakers nice and clear,and yes a AMP would make these things thump even more so.
So over all am very satisfied with the purchase ,sound is great and they are ,louder and clearer,blows stock speaker away by far. Great investment"cant wait for the amp"but not needed at this point. I just like it loud.