Is there a magic formula for spending on components in a system


Hello to all...

I'm looking for opinions on the magic formula for purchasing components base on catergories:

Source or sources

Control

Amplification

Sound Transmission

Interconnection and Cabling

Setup and storage

Thoughts? Opinions? Your system "equation" ?

PS: which of the above is the most important block in the wall? 
insearchofprat
Is there a magic formula for spending on components in a system?  Even better: there are many such formulas, each with its adherents. And each formula is right for someone.

In other words, I agree with @almarg on this.

I agree with those above who stated there are too many variables. 
The greatest ones are your total budget and the efficiency of your speakers.  I have two sets of Magnepan and ended up spending a lot more on power amps than I would have spent on efficient speakers.  
However,  for the past 25 years, I appear to be addicted to Maggies.  

Percentages have gone up and down I’ve the years as I’ve upgraded this piece or that. And, I use new prices to calculate tough many pieces have been purchased used. That said: 20/30/30/20 percent, for source/amplification/speakers/cables. There’s no turntable in my system—it would certainly be more for the source if I was into vinyl.  And cables are usually bought used or on sale...again, I’m comparing list prices for new equipment to come up my magic formula (hey, at least it’s easy to remember).
The speakers and room provide the vast majority of your impression of your system assuming competent amplification and source.
This is right on and my experience...

But controls of the acoustic of a room has 2 part: a passive well known one, easy to read about ; amd an active one very important and no so easy to read about and figure out...

But all that can cost peanuts with your ears and listening experiments...I transform mine without any measure, and the result is amazing on all count at nearfield or regular listening...


But decreasing the electrical noise floor of the house is very important on all aspect of S.Q. just below the acoustic controls....

I buy low cost vintage very good elements for the system.....

The more money i invest were in my homemade controls of the mechanical, electrical, and acoustical embeddings.... This is the KEY....

When you forget upgrades and listen music like never before you know you are there.....