I just took out Polk MM651 - WHICH WERE MELTED DOWN G.DD.....
ran 1 of each - THERE IS A DIFFERENCE for sure.
Great Great speaker... no regrets here...
They sound the same as our regular 7.1, just a lower power rating. They are really efficient and would work good with that radio. This would be louder than a stock HD setup. You could add a lower powered amp to them if needed. This will not knock you off the bike like a higher powered setup but is a decent improvement over stock. We have a lot of customers that are happy with a setup like this, guys that want better sound and more features but do not need a huge system.