Am I risking damage to B&K 5x200 driving an 8 inch sub?

I built sealed 8 inch subs to supplement the low end of my 1.6qr Maggie's. They are actively crossed at 150hz to 50hz, with a 15 inch pulling true sub duty.
Should I be concerned that I may damage the amp? It is rated for 4 ohm, but gets pretty hot.
Sub is the Dayton Audio RSS210HF-4 8" Reference Series HF Subwoofer 4 Ohm
If a sub amp is recommended, I am leaning towards a Crown xls 1002 or similar.
Thanks.
 
Dayton specs show it dips to ~ 3.5 ohms up high, so might be best to actually measure its minima in the sub's passband. Didn't find any useful info for the amp, so no clue its designed performance parameters, but historically IME, as long as you can comfortably keep your hand on it, it's not running too hot regardless of amp design.