Mike Fleming Moron wrote:

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And I don't think my sitting room is big enough for an orchestra to
play in it. Expanding the walls to match the concert hall would run
into issues with planning permission, and next door's side wall.



** In a heavily damped room, the lack of reverberation makes the walls seem to disappear. If you play a recording with room ambience included, that is then the only ambience you hear. The apparent "size" of your room changes with each recording.

Much the same experience is heard when listening on good headphones, except the main image is in front of you.



..... Phil