A power aid is an aid that is just that ..more powerful
lol The power aids that I know of that are mostly used (there are more i just don't know all of them) are the oticon SUMO DM, the Phonak Naida and I beleive the phonak Audeo YES is now similar to the naida sort of, as well as the Exelia ART. Many aids come in power versions like mine for example, I have the Phonak Versata Powers, but are not for a profound loss as much as your sons probably is. I hope I answered part of your question correctly. I don't have a profound loss but moderate/severe and my aids are good...for now
lol good luck with trying out other aids for adam's left ear