Mine is a 15 RGS too. I just picked it up Sunday. It has been sitting waiting on my king tourpak but it is on backorder until later this month. Killing me. I had the Polks in my 98RG and I loved them. I started out with an Alpine head unit and they sounded great(4 speakers, front and rear) and then I added a Soundstream amp and they would blow you off the bike and still have excellent sound quality. I want quality, not just quantity. That is why I am going back with them. Dealer tried hard to push their Boom2 but I said I didn't want expensive junk. Others are using the JBL GTO speakers but they aren't marine grade and the Polks have a higher sensitivity so they will sound better. They cost more but they have 2 year warranty and I know what to expect.