Must say that I am really pleased with my new Rockford PBR300x4. I bought it as a replacement for a Massive NX2 on my HD Street Glide. The RF, even with slightly lower power ratings, sounds better and gets just as loud or louder cleanly as the NX2. Anyone looking for an amp for their bike, this is the way to go. I had the arc mini previously as well and I still think the RF sounds better plus I still have 2 channels open for when I spring for the 6x9 bag lids.