Originally Posted by etduc
Which MM are you talking about? I bought mm651um, over db651. Haven't installed them,yet. All Polks speakers, (I've owned a home set.) pretty dang impressive, at their price points.
Just noticed that there's a difference. I was just looking at the regular mm651's because it says their still marine certified. Those UM's look like they have better seals and what not. Is that the main difference?