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I have the Polk MM651s in one bike and the Biketronics 7.1" Titan IIs in the other. I've also had the Biketronics 6.5" Titan IIs.
My vote would be for either of the Titan IIs. I wear a helmet when I ride and can definitely hear them better and more clearly than the Polks.
The Biketronics cost more than the Polks, but come with an excellent set of adapters. The Polks will require you to buy a set of adapters costing $40.00.
Does the PBR 300x2 come with the plug and play harness for HD Harmon Kardon? Seen Yaffee has one called the PBT300x2 is it the same amp and they make a harness?
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