Which Cable Makes the Biggest Impact?

I thought I would update this original post and add in the digital cable:

1.  Power Cords (in order of importance: Source, preamp, then amp)

2. Interconnects

3. Digital cables (almost a tie with interconnects)

4.  Speaker cables.....

Biggest impact: Speaker Cables

Mas o menos: Interconnects

Minimal: Power cables - Diminishing returns maxed at a 100 dollars if you have a decent filter or conditioning solution.

Tonearm.

IMO…

1. Power cables - for power conditioner, amp, source components 

2. Speaker cables

3. interconnects 

4. digital cables (whatever the connection method…USB, ARS/EBU, etc.)

5. Ethernet cable to streamer

All with a caveat that you have all the critical stuff (top notch components, speakers that you really like  and your room acoustics) in order. I wouldn’t worry too much about cables (isolation devices, or footers too) if any of the above critical items aren’t taken care of first. Cable swaps are easiest and most of the time the cheapest changes we tend to gravitate towards but as long as you have decent, neutral basic cables like BlueJeans or Mogami, worry about room acoustics and components first. 
Just my $0.02 based on my experience and how far into this hobby I am at this point. 
 

@deep_333 I don’t thing $100 is a point of diminishing returns for anything in this world right now…although it would really be nice if that was the case!

Unfortunately - my impression of biggest impact is clouded because the order I experimented.  I think the answer might be 'where ever you start'.

I started with speakers, ICs and power cables.

In each case they made an impact resulting in me continuing to experiment and listen.

During my experimenting with speaker cables I used mogami XLRs and the OEM power cables. 

• The speaker cables had an impact on sound stage and clarity.
• IC's improved details
• Power cables improved details especially in the lower frequencies.  

And for the record I would have been really happy to not have heard a difference!