The "perfect" sweet spot would only be big enough for one person. Any more than one person present and a direction from which the sound travels from the speaker to your ear would be blocked by the other person.

Home audio is a lonely hobby if you consider that no one else will hear for you.
However forums like this one can help make that lonliness bearable, especially when a significant other fails to appreciate the finer points of our passion.

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The answer to Life, the Universe and Everything is 42. But what IS the Question?