The only way you're gonna get full sound is with a sub in the saddle bag.

I'm leaning towards doing this with my bike this time.

 

You're going to need an amp. I'm not sure what the power is on the boom system but a buddy of mine with an Ultra has the boom system. Amp, fairing, lowers, tourpack. It sounds good and he is happy.

I was pretty happy with my arc/infinity setup for about the last 18 months. The sound was very good on the highway. I finally blew one of the infinitys after running them for 12 hours at pretty high volume on my last trip. I think I'm going with Polk MM 6501s this time.

 

ERRONEOUS ! 6 X 9's will do a fantastic job for bass !!!
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I was Eastside Harley a few months back and heard one of their systems. They actually put a sub in one saddlebag. It was in a sealed box, but they also cut out a hole in the bottom of the bag. So actually they were using the bag as an enclosure. Sounded awesome. Lots of bass. I am leaning towards doing this but don't have the ***** yet to cut out a hole in my saddlebag..lol. They were also running focal speakers in the fairing and with lowers. Bike sounded great. Much better than my 6 pack system.