Directionality Explained

But if they are..."Just Marketing Schemes". .How is it they are still in business?

Check "socialization" and "experience"...

https://www.smartling.com/resources/101/what-can-we-learn-from-coca-cola's-global-marketing-success/

If something is not mathematically measurable, the result is very subjective and mostly snake oil. Since "depth", "image", "slam" and a lot of other audiophilic drivel cannot be measured, all claims should be taken with a ton of salt 😀 it is still mostly drivel.  

If you can’t hear depth, image, slam and a lot of other cues, then you have crappy hearing, or a crappy system and rely on the old fall back position of "if it can’t be measured....blah, blah, blah" to make up for it.

I still have lots of old cables and they all sound different to anyone with intact, functioning hearing abilities.

All the best,
Nonoise

I am not talking about depth. I am talking "measureable". Easily.

It is really not that hard. "To measure a difference". What is hard to define is any, "particular", sound. But that, can be done though it may be exhausting. And that in, "your" rig,. We are talking about things that "you" need to at the very least, have the basic understanding of. Concepts that are available for you to learn. But "You", need to learn them. I cannot do that for you. And I do not believe any of these, "Concepts" are at all, "Rocket Science". Just a bit past basic physics really. 
And since I have never called you, "Grasshopper".....

If you wish I can tell you where to begin.
The rest is up to you.

Yet still, I shall not call you, "Grasshopper".
"Weedhopper", possibly.....