@DonH50 - I was not being sarcastic but after your explanation, it is crystal clear why you would say that. I read that statement and assumed something else. It was this misinterpretation that I found surprising. Thanks for clarifying.
Tom
No worries. I realize my opinions are diametrically opposed to most here and try to behave and stay out unless I feel I have something technical to contribute. Even then I usually just dig myself a hole, often when a question I thought was technical was not really the ask. Need to learn to not post unless it is in the technical area. In the end, I need to reread my signature, and remind myself what's really important is the music. OK, and maybe the movie, and the family, and the dog (R.I.P.)...
On-topic, one thing I have learned over the years, and keep re-learning the hard way, is that it is easy to underestimate how much power you'll need in ten years or whatever. I had three 20-A lines placed along the front wall where the gear went, letting the sides and rears be handled by a normal 15-A loop. Then several years later added a couple of subs in the back, and wish I had stuck a couple of 20-A lines back there...
One thing that can cause problems with multiple lines is that the potential for ground loops is much higher when you are plugging a bunch of components into different outlets with isolated lines back to the service panel. I was cognizant of that and went with balanced (XLR) equipment where I could, including the AVP, amps, and rear subs. No hum, thankfully.
Building a room it is also worthwhile to consider lighting. Having a track system or two to aim light where you need it (and keep it from where you don't want it) can be helpful. Avoiding dimmers, or at least getting low-noise types, is helpful. LEDs are great but can actually radiate a fair amount of noise, especially the cheaper ones (IME). A friend of mine took a cue from the RF screen room at work and went with DC lighting in his media room powered by a supply in a shielded cabinet (rack) outside the room.
Finally, if you are building a new room, floating walls and ceiling (and floor if not on concrete and if possible) can be a big help in isolating the room from outside noise, and letting the rest of the house remain quiet when you decide to crank up the system or watch a movie late at night. Don't forget the ducts; the HVAC system is a great path for sound transmission into or out of the room. I went with a minisplit unit so there are no ducts to the rest of the house in my media room. I did add an external duct and fan for air circulation; we are in a rural area so a bit of fluffy pink insulation in a box is sufficient to reduce noise transmission. In a more congested area I'd've had to build a studio box for the inlet and outlet ducts (multiple layers and staggered baffles, much like the muffler on a car).
I be shut up now - Don
