Typically JM Labs are very efficient, but I cannot say I know on this model. What could be very positive about this speaker, is that with the NAD gear, you effectively increase the power delivery and headroom of your system, without investing in new power amps. You have to consider if you plan to later upgrade the NAD, or is it were you plan to stay. If possible, get the Cobalt 810 in your own home, with your gear and see if it makes you happy. That should help your decision. If the dealer will not allow that, I would require him to hook up your equipment in his showroom.
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