I'd let her know from the gate that you're into your hobbies and if she isn't into supporting your hobbies, then she should be looking in another direction.
At twenty-seven, my hobby was partying every day of the week. At that age, most gals were right there with a guy and when one becomes a homebody and hobbies change to home centric hobbies, women have a way of not understanding and then relationships fall apart. Fortunately, as my relationship with my wife evolved, we both became homebodies and we work to make everyday a special day.
Today's specialty, going into the backyard with a metal detector to dig up buried fence nails. She swings the metal detector and I do the digging. Through it all, she knows and understands how important the Home Theater is to me so, although it's not her thing and she may not like it, within reason, she approves and we get along on the Home Theater issues.
We currently have a 60" screen. When this screen fails, we've talked about a replacement screen and decided that an 80" screen is too big for our room and we'll go with a 70" screen. Because of our interaction, yes, a 4520ci is in my future. Because of my interaction with the forum, shortly (medical bills to be paid first) I'll be upgrading the subwoofer sound reproduction system.
It's all about finding a companion that understands.