I run the BT 2180 & 4 Titan speakers in my 15. 2 in the fairing and 2 in the lowers. The lower speakers add just a touch of sound IMO. While riding, the bulk of the sound that I'm hearing is coming from the fairing speakers. On my old bike, which was an 02 FLHT, I ran a totally different head unit, amp, and speakers. I had 6 speakers in that old girl. 2 in the fairing, 2 in the lowers, and 2 in the t pak speaker pods. That system really rocked and volume & clarity was never an issue. Even on that one I could hear the rear speakers more than the lowers. I never tried bag speakers because I personally never saw the point of them.
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2015 Denim Black RG, FM ss ceramic coated 2-1-2 pipe, White Bros Original E Series Mufflers, FM ac, PV Tuner