To put it in another way, don't quit your day job if you get started on this venture.
Please take what I've said in the right way: My intention is not be be a naysayer, but to give you an idea of how things are in the Hifi scene.
Here's some perspective from a well established manufacturer (who also owns some VERY established brands)
Every business idea
needs naysayers! It is vitally important to face the negatives and to be able to counter them. Face the
Why-nots, and if you cannot deal squarely with them, you are better off doing something else. This is not a negative view: if they outweigh the
whys then forget that project, but don't stop having ideas: the next one might be a winner, or the one after that.
My first thought, when I saw your original post, was, "what is your track record? Where are your successful DIY designs?" It might be that, without giving up this idea, you need to add a few years to the timescale, devoted to study and building. If you are not at that level, at least, how will you be able to assess who to employ, and how will you be able to assess their ideas and results? You can make that kind of partnership if, for instance, you have long-term friends with technical know-how, and you can contribute the management and finance expertise (do you have that experience?), but I'm sceptical about starting from scratch with unknown people.
There are a few accomplished DIYers among our members, and I would start by asking them why they, even those that make and sell, do not turn their passion and skills into a full-time business.
There are professionals too, but, although you might meet with unexpected generosity in some aspects, I don't think you should
expect them to say, "Hey, set up in competition: I'll tell you how!"
So, yes, I'm quite good at nay-saying: I've sat in many management meetings and done it. It can get one a bad name --- but it is an important function

hyeah: