Tweaks and upgrades that aren't gimmicks


Hard to tell the real deal sometimes, especially when each one of us has different tastes and even most likely hear things differently. When does a new purchase substantially improve the sound consistently over and over for many users?
Let's see if we can come up with a list of things that without any doubt has improved the sound of our system.
This list can include components, cables, room treatment etc.
pedrillo
a better outlet, relatively cheap and should be instantly noticeable and last for years.
a dedicated circuit (20amp). cery cost effective if you can do it yourself. If so, run at least 2..1 for source, 1 for power amp. immediately better...quiter, cleaner, blacker etc.
Room treatment cannot really be argued, a "naked" room will sound like crud, everyone has at least some form of dampening be it sofas, chairs, or floor coverings, but going above and beyond this is a huge difference. I have found outlets and dedicated lines to be beneficial and cost effective. I would also add some type of vibration control, doesn't have to be expensive but something like Vibrapods or Isol Pads (I have used both) can make a noticeable and positive change to any system. Cables are a tough one, because the wrong ones can make performance go the wrong way.