1.Insist that your wife has golden ears and can hear far better than you, even if she hasn't and cannot hear the difference between the sound of a radio-clock and say the $70kilo Pipedreams.
2.Let her criticise your system und take her remarks seriously. Even if they are far off the mark, make an effort to pretend to. Don't argue, be grateful!
3. At your next upgrade, tell her that it was thanks to her advice that you took the necessary steps. If she has golden ears, she'll be happy. If she has tin-ears, she wouldn't know the difference. The result however is identical as well as beneficial:
4.She will be sure, that apart from listening to your system, you are also listening to her. (~;