I have MM691's (the 6x9) version in my saddlebags, they were being powered by a RF 300x2, no problems yet. After next week they will be recieving power from a HW CS300, so technically the same power, I've only had them a few months, but the MM651's I had in my fairing before I switched over to Focal served me well, and I've also installed them in friends bikes.
2010 FLTRX With Plenty of extras, goes by the name "Hardeshia"
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Also not pictured 2016 FLTRXS and 2017 FLTRXS, you never can have too many SHARKS......