I can tell you 8s or any speaker in a lid will not give you any bass. The JL 8.8’s i had on my last bike were ok but i still wasn’t happy. Your best bet is to add a set of 8s or 10s inside your bags. I’m in the process of doing 10s right now.
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2012 FLTRX, 26" AS Bolt on kit, 26" Mad Wheel, Dirty Bird Top Shelf Rear, Yaffe Tank, B'Cool Front Fender, Fueling 574 Cams, Sikpies Exhaust, 12" Yaffe Bars, Alpine Head Unit, Hertz hpd4 amp, 4 Hertz Spl 6.5s, 2 Hertz st35s, 2 JL 8.8s, Voodoo Speaker Lids, Rear Air Ride