What was the first power cable that you noticed a difference in the sound?

Still waiting. See I'm one of those guys who actually took a physics class, studied power distribution and networking, and practiced it professionally for nearly 50 years, and have seen and heard, if not all, most of the tweaks in that time.

Here's one - the original Monster Cable demo had 18 Ga lamp wire rolled in a coil behind the switch while the Monster Cable was laid straight. No surprise the Monster Cable A/B'd better - the coiled lamp cord was a series inductor, AKA a low-pass filter with measurable DC resistance. Trim that out and the difference went to zero. 

If a power cable 'lowers the noise floor', that would be measurable, and might just help things.  Anybody ever measure that? Yeah, didn't think so. 

In my system, QSA Lanedri, and I've had the Argento Flowmaster Reference in my system. 

@panzrwagn zzzzzzzzzzzzzzzzzzz

@jacobsdad2000 zzzzzzz ? Yeah, that would be a grounding issue. As in your lack of grounding in basic physics and electronics.

@curiousjim Master Couplers are all over used sites, I’ve bought 5 or 6 of them from ebay or audiomart etc. SR doesn't make the anymore.