I've had both, IMO the Kappa is a better quality and better sounding speaker. Also you can buy the Kappa plus the adapters for less than what the JM cost, so you can still use the adapters if you decide to change brands in another couple of years. Remember the newer Kappa is the 62.11i just in case you go that route.
Sent from my SPH-L710
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......