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Concert Hall at home -- high frequency rolloff is a dynamic event?

Sound absorption by the air, materials in the room & audience clothing causes treble to fade to inaudibility (-60dB) faster than mid-range and bass because treble is so much easier to absorb -- that's why the RT's are different. High frequencies from the direct sound are rolled off by the air between the sound source and the microphone, which is often much closer than our ears would be at a live concert.

It's impossible to reproduce hall reverberation with two speakers at home -- surround sound can reproduce hall ambience well when careful recording techniques are used ... but you also hear some home listening room reverberation added too, unless you listen in an anechoic chamber.

Usually microphones will be placed much closer to instruments than your ears would be when seated in an auditorium, at least for the seats I can afford. The closer microphones pick up more treble detail than our ears would hear when located further away. Hall reverberation should be recorded with other microphones but when it gets mixed into only two front channels, it's masked by the much louder music coming from the same speakers.
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Richard BassNut Greene
My Stereo is MUCH BETTER than Your Stereo

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