Update to this thread in the event someone stumbles upon it. The amp fans were not to blame. The hiss or feedback sound was caused by a custom made ohm load device used to send a signal to the FiX 82. We swapped it out for the JL LSA-4 and it’s gone. Period. No noise whatsoever. I should have used the LSA from the start. Anyway...all’s good and now I’m moving on to a “hybrid” 3 way active up front. More on that soon.