With loudspeakers. But I, and I suspect most people, probably wouldn't go to that extreme and just pop on some headphones instead. @UltraNearFieldJock says in #42 of that thread:Ultra near field, you mean as in headphones?
Yes — Ultra‑Near‑Field (UNF) listening is a real and recognized audio approach.
And yes — it literally means listening only a few centimeters from the loudspeakers.
Below is a clear explanation based on verified sources:


Anyone has got or had an experience with ultra near field listening?
The arguments are very logical, and when I started the experiment, I had the same fears, and I was sceptical whether I would succeed in eliminating this disadvantage. But in retrospect, the 3D illusion after the fascinating, deep bass without room infusions in UNF is the greatest benefit and...
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