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Reliable Copper Banana Plugs in Europe?

Can you give a TL'DR of the results. Did they actually do any measurements showing impact on the audio signal at the speaker?

Because if it is anything other than "The small resistance differences measured are not enough to give an audible difference in sound"

it is almost certainly nonsense - assuming none of the plugs were broken by design.

Could be useful for identifying inadequate quality components.
I can’t tell if all the tests he did are ultimate for final word, but I thought it might be a good starting point at least.
@Sokel already beat me to reply quicker, thank you.
 
Unfortunately test test protocol is only hinted at in the video, but text description.
He used normal 4 point Kelvin connection to measure just mOhm at start but because the (otherwise nice) tolerance of the DMM did not allow such precision he switched to feed it a constant 1A current and measure the voltage drop across the connection.
Seems legit.
 
As shared here, here, and here, nowadays I seldom use banana plugs.

In case if I would use banana plugs only tentatively, I always use Audio-Technica's solder-less two-screw banana plug AT6301;
https://www.audio-technica.co.jp/product/AT6301
The pros of AT6301 are;
- reasonable price (JPYen 1,980 [USD 14.85] for four plugs, two pairs)
- rigid and well QC-ed gold-plated plugs
- the two screws are well (precisely) manufactured and can be fixed tightly
- the outer vinyl (ABS resin) sleeve is complete insulator (this is important for SP binding posts of rather short distance between L&R)
- the outer vinyl (ABS resin) sleeve can be screwed-in "after" the cable connection
 
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