So you think wire conductors in cables are directional? Think again...

@edgewound: Isn’t it time for your Roblox now? Please go back to your mom’s basement. 😉😬

That's a great question. Air is the medium that carries sound waves in a listening room...unless your listening under water...where sounds waves travel faster. Notice how sound is different on a hot clear day vs. humid day vs. cold, cloudy, or especially foggy day?

Would it make sense that the changes in atmospheric conditions in a room would have an influence of soundwave transmission? No medium...no sound. Sound travels through different mediums at different speeds. That's something you can find with a Google search.

All that is patently obvious....the question was about "how much air is in the room" and exactly what effect there is when it changes and how that kind of change would occur "at any given moment" ( which implies a change over a very short time-frame ).
Cheers

Show me your evidence. Don’t tell me. I have friend that’s a PhD in physics. Experts in science require evidence. So far, you’ve provided none to the discussion.

C'mon man, you're wearing out your welcome.

Show me your evidence?-- Someone heard it and owes you nothing in the way of proving it.

I have a friend that's a PhD in physics.-- That's nothing more than an appeal to authority and a lousy tangent to use in an argument.

Experts in science require evidence.-- I can give a s*** about who requires what. Who are these experts and why do I/we owe them anything?

You seem to be entirely hung up on the concept that someone owes you something. You keep on demanding it. It's the underlying premise in lots of your posts. It's the faultiest of premises to work with. You're coming across as a whiny, pouting kid who wants so much to be right. 

All the best,
Nonoise

I've recently seen speaker cables advertised from a manufacturer that are $30K for an 8 foot pair

So, don't buy them. There is a lot of stuff that is too expensive for most people, but for some it's a drop in the bucket.

Since we’re only concerned about the bandwidth audible to humans and runs of cable in feet not miles we don’t need to worry about skin effect

It may be a bit more complex than that....see below a part of a comment from Bob Smith in the following article...

https://www.dagogo.com/audio-blast-schroeder-method-interconnect-placement/

"Noteworthy in the above is the fact that the Capacitance doubles and the upper Cutoff Frequency (where above which the signal begins to be attenuated) almost doubles. So in the event that we “double-up” our audio cables, we actually extend their bandwidth – albeit we are talking in the region of radio frequencies so there is no real benefit there with respect to extending the fundamental audio bandwidth.

What IS significant though is the fact that all of the above leads to a potential reduction in reflected energy and/or standing waves within the cable, and that is because of two primary factors. By lowering the Character Impedance and consequently, raising the Cutoff Frequency, we “push” or force any potential reflections up to twice the frequency at which they would otherwise occur. That then leads to two other outcomes. First, higher frequencies find it more difficult to propagate down the length of any conductor due to the “skin effect,” and are therefore usually attenuated more with respect to those that occur at lower frequencies. As a result, lower magnitude levels of reflected energy translates into less interaction with the Source and Load circuits. That means less potential for the formation of any associated Phase Distortion artifacts as outlined above.

Second, any modulation effects that do arise will be shifted up to higher frequencies right along with their higher “carrier” (the frequency of the reflected signal), thereby making them less detectable to human hearing.

In all the above, the only potential negative concern might be the increased Capacitance, as theoretically that “could” cause a roll off of the highest frequencies in the region around 20KHz. In most cases though where there is reasonable output capability of the Source’s output stage, this should seldom – if ever – be a problem.

In summery, doubling cables as in the Schroeder Method seems to be a viable technique in an effort to create a “composite” cable the exhibits higher bandwidth, and hence less and/or potentially fewer forms of Inter-modulation Distortion. Thus, it only makes sense that listeners would observe an improvement in the resulting sound of their systems by implementing it."

A reasonably close analogy would be reducing the room generated noise thru acoustic treatment to produce a lower noise floor.

Cheers