Best Tweak???

Cheapest:

Change the wall outlet with $10 hospital grade one, like Arrow Hart 8200. It's a cheap way to experiment with power. I was sold, and after that experience went ahead and ran 4 dedicated lines.

Even cheaper:
Adjust your speakers.

Adding a Neuance Shelf under my Theta transport. I need more of these for my other components.

Vintage NOS tubes for my Blue Circle preamp. I don't ever see going back to solid state.

The Porter Port and Furutech eTP-60. Outstanding!

Finding the right toe-in and seating distance combination. Eye opening.

I think Viggen's tweak of having the doctor remove his earwax can't be topped though.

Marco makes some great points. The less you worry about how your system performs, the more that you'll enjoy the music. Reading about other's systems, comparing notes of various products, lusting after gear, etc... all ends up detracting from the enjoyment that one could already be experiencing with what they have.

As such, i'm going to combine Marco's response with KP's. That is, if you doubt the effectiveness of Marco's comments, spend the time that you would reading about audio on the net or with a glossy rag tweaking your speakers into place and / or listening to a recording or two that you haven't heard in a while. Once you've got the speakers dialed in, you'll be amazed at how good your system sounds, regardless of what it costs or consists of. These "tweaks" would come at a mental and / or physical expense, meaning that they are by FAR the best bang for the buck since you have no money invested in them at all. Sean
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PS... Try the above and then come back here to find out what to do next : )

Trying new music. When I am at the library I will usually check out the selection of music they have on hand, and usually something I would never consider buying or something I have no knowledge about. Since our library serves a large population the selection is wide ranging enough that I can explore a few different avenues. I do always find myself embracing this music- Renaisssance Madrigals, as an example, did not sweep me off my feet, but I did find the insert interesting. Regardless, the experiment is always sucessful in that I am made aware of the world of music out there, in that it keeps from falling into a rut. If I do not always like or appreciate what I hear in music I am not familar with, I always do return to what I know and love with a sharpened sense of makes it special to me.

Cd Romulus..Redirection of sound pressure away from room boundaries towards the listener using specific shapes and dimensions. Sistrum, not a tweak a requirement. Removal of all dampening material from system and walls.Me the carpet and furniture are all that remains. I am a dealer of many products and one is Sistrum. Tom