Danny is correct, 16" tall and they start 6.25" wide.... there is a roundover on each vertical edge so the actual face ends up being about 5.25 , just wide enough for the waveguide of the Neo10.
They are indeed wider at the rear, the wings extend rearwards at a 10 degree angle.
The rear of the lower section ends up at approx 11" and sitting atop of a 1" base, the lower section will be 27.5" tall.
jay