Need some advice, I need to purchase a 4 channel amp the choice between sundown 125.4 or ice 150.4 The only thing that's holding me back from buying the sundown is I've just read its a D class compared to the SPL ice 150.4 which is a a/b class. Would there be a big difference in sound quality on my mid & tops? I use a sundown 1500d v3 on the bass but I need a 4 channel to go with it. Thoughts please