Make the aesthetics of the system a beautiful part of the home. Get her involved in auditioning new music. Let her choose the next live concert. Get her opinion on new 30-day loaners as to whether you keep the item or not.
Chances are that if you are a bit older her hearing may be better than yours. Let her know how valuable her opinion is to your hobby. Let your system be a part of evenings with friends playing the music THEY WANT TO HEAR.
Get creative!