If you really must focus on a PRODUCT - How about some sort of wall hanging that absorbs stray sound waves? This has all been done before, but if you had something with a certain STYLE that wives found to be attractive, you might be on to something. Again, your market would be shrinking out from under you regardless.

We are going extinct, so your business model will have the challenge of less and less customers all the time. Have you seen the famous Maxell Tape advertisement with the seated man (wearing shades I think) having his hair blown back by speakers? It is an iconic piece that you might like. Certain things that drive us: sound quality perhaps “better than you have ever heard”, or better than you have ever heard per amount of money spent on such gear. We are having somewhat of a fascination with the gear itself, how it is made, how it works, perhaps how we can make similar stuff DIY ourselves and the desire to own stuff and/or to collect stuff. An important aspect - one must enjoy just sitting in one place and listening. Might be thinking of past memories, music itself, the lyrics, ideas spurred by the lyrics, or just relaxing - but also being aware of details and how your own equipment is presenting the details - you may be listening for things that are very soft or very loud and powerful. What products do we NEED?? Absolutely nothing. I may be borrowing from the other comment when I say, just invent something that looks good and present it with flowery language that is mostly lies. We are old men. So as human beings we need what any old men need. I would guess 50 yrs old is near the low end in here, although there is some resurgence of interest in more youthful circles I don’t guess it is significant or lasting. We do love when a young person shows interest. We would love to have YOU do a field trip to the most expensive audio store you can find. Tell the people you want to hear some $10,000 speakers with an appropriate amplifier, at least $3000. Ask them to play a song you have heard many times before. Then comment back to us what your impressions were! Best of Luck!!!

Others have hinted at this, but many audiophiles suffer from “audiophilia nervosa”, the idea that there’s something wrong with their system that could be made better by upgrading components, leading to “gear acquisition syndrome”.

Thus you have companies that market directly to that fear, selling expensive things like power line conditioners, power cords, interconnects, speaker cables, equipment isolators, devices to keep your speaker cables off the floor, etc. Or by claiming that their equipment is superlative in order to justify the high expense.

You might have a look at r/budgetaudiophile to get another perspective.