That RC62 looks nice, but 98dB with 2.83V in. Depending on impedance, that can be much more than a watt. Under impedance it says "8ohm compatible". Not sure if some specmanship is going on there....and they do not spec if it is a 2pi (groundplane) efficiency spec.
Also, for Wayne Parham's speakers, please do pay attention that his specs delineate that they reach the dB sensitivity mark with 2.83V in quarter space, or wall-loaded (except for the corner horns, which are of course corner loaded, and the 12pi sub which is a groundplane spec). This is different than a 4pi (freespace) specification.
Granted, most will use Wayne's speakers in a 1pi environment, and 0.5pi for his cornerhorns, and they will see this efficiency.
Odds are Jed at Clearwave may spec his for 4pi space, netting the 88dB rating, which may be bumped up inside a room. But the best place to ask is over at his forum.