I'll tell you something I learned a while back... Be careful taking marriage advice from a third party... USER BEWARE... We do not know you {5 posts, give it time we will get to know you but not there yet} or your wife {0 posts} so we can not say what is rite and wrong...
I will tell you about my situation, I am in my early mid thirties as is my wife. We have 2 kids {15 and 13 both boys}. When we lived in our smaller house, I was smart enough not to press certain issues, like a huge subwoofer, tower speakers, a dedicated listening room, integrated gun vault, ect ect ect... BUT when we were building my current house {over 4K sq feet} I made sure she knew what I was expecting, I said things like "I want a really nice HT speaker system and a dedicated music listening space" and when we were wiring the house I said things like "make sure I have an outlet here for my amplifiers, blah blah blah"... Then move in day came...
All of the sudden she forgot about my interior design ideas!!!! she wants a mirror here, a picture here, a small table there ect. So we sat down with the computer program to plan furniture and I said " look we need to come to an agreement here, I built a house with 3 parlors so I could have some where to relax away from you and the kids if need be" at first I got the basic "real nice, you want to be away from me just build a separate house" and I said "if I have to I will but it probably wont be in the same state" you can see where this is going...
We ended up agreeing, that as long as she had some input and we agreed {in other words no one had final say} I could put speakers where ever I wanted.... Now they are part of the decor', we have a front parlor that is for entertaining that I put a 2.2 music only system, my HT room is just a general living room that she really doesnt care what it looks like so I got away with a 5.2 system with ceiling mounted surrounds, the master bedroom we agreed that a classy tube system would be a nice touch, so I got a tube amo and a pair of saticnred tekton lores, my office got a 2.1 system, the guest room parlor got a 2.2 system, the pool room got a 2.2 system, my gym got a pair of bookshelfs as did hers, the garage got a pair of bookshelfs, not to mention the 4 porches got 2 speakers each and the whole house system has 6 zones built into the ceilings...
Moral of the story, is work with her, she didnt want HUGE black speakers in the formal parlor {cant blamer her} so I got some very attractive rosewood speakers and had a stand made for them. She didn't want a subwoofer in the bedroom, so I found the tekton lores that have great bass and sound different than my other systems as well as not needing a ton of power....
Another point I would like to make is, DO NOT, ruin the comfort of your house for sound quality, you do not want to have to walk around a subwoofer in the center of your room because that is where it sounds best, you dont want to look at painted egg crates on your ceiling because it makes it sound better, you have to love there, its not a recording studio, comfort first, then aesthetics, then sound quality..... You are not going to have a huge deficiency because the subwoofer has to go on the side of the couch, youwill not die because the speakers can not be in the optimal spot for best sound stage... Its a house you live in, you are going to have hvac noise and phones ringing and general ambient stuff happening that isnt going to make the experience 100% no matter what, make your wife happy, enjoy life and be thankfull she didn't say "our htib is perfect, why spend any money on speakers, I need a new handbag".....
and also like others said, involve her, get her to want it to, I take my wife shooting {not hunting, she is a vegan that wont wear clothes made from cotton, lol} but she loves to shoot so now I don't get any flak about going to the range}... She blasts our bedroom system when ever she is getting ready to go out, I come home and hear m tektons screaming the latest luke bryan crap all the time... so its not my stereo its ours...