You're not really trying to put this in the general shared direction. Kick the kids out, if you have, they're old enough. Then overtake their property, you paid for it.
Really, it just leads to frustration, you need your free-time and your wife too, if she wants to relax. You don't have a corner that is not located in a) gym-room/bedroom, b) living-room, C) kitchen or d) bath-room? A dry cellar or sth. underneath the roof, or a shared office/working room. If not you could just easily build a non-permanent drymountedwall niche with Rigips and most importand soundproofing.
Your partnership shouldn't get affected by your hobby, if you love her. Find a solution that you can have your fun, your chamber or whatever, but without disturbing others. IT will not go without compromises or a few usual gifts (shoes, parfume, a wellness-weekend), you need to offer a bit, not just promises, since you want sth. too from her. That's the deal, I had my Flight equipment this year, Madame Knoch got extra-orbitant wishes fullfilled, new furniture, wellness weekend, clothes, all the stuff that makes man poor. Still I paid her back in my hearted manner, this she gets me covering it over and over on my bread. For a lousy X52Pro, needles to say if I would buy a scrapped MiG in Kecsemét in Hungary for our Schrebergarten. Vacation on Bora-Bora, all inclusive, Ski-adventure in St.Moritz or paddling on Lake Geneva.
But to what it leads if you just enter the archaic course,
I see it when my girl settles with her netbook and full equipment in our livingroom/relax-zone, I can understand she needs the TV going, her music running to learn Marketing management, but what when I wanna watch TV and just lay in the horizontal after a shitty day and want my quiet. We have a working room for such things.