Well, for one thing you would have had the concert or play or the speechifying or whatever on the edge of a lake or sea or had barrels filled with cold water all around to uh, help with the acoustics.
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Not exactly. The tools and materials are similar, but scale and amount and goals are different.
The recordings you listen to already have the sound of the recording venue included. When you play this back, you want to hear that, and not your own room (most of which sound horrible untreated and empty).
Well, that's a little exaggeration. You want 70% of the recording's effect, and about 30% of it to be from your room.
There are also issues of dimension and space. A good venue for a violin recital has the reflection points tens of feet away from the musician. In a home a speaker is usually 2-3' away before the back wall.
The amount of time you want the music to live in the room also is different often called RT60. Then there's room modes. Small spaces often have significant modes below 80 Hz or so. These don't really happen in very large venues the same way.
Does this help?