In live music, we have intermodulation. Two trumpets or a trumpet and oboe playing together create sum and difference tones that change depending on pitch interval for instance. For music in major keys, this intermodulation is additive - for music in minor keys, it is destructive. Bruckner used this to great advantage for instance. This effect is never as present in playback as in live music. This is because the intermodulation requires LF response to 1 Hz as well as integration of the highest frequencies.
Low frequency response is hugely different between audio events in a „smaller“ fixed space and „larger“ spaces. In a typical living room with the doors or inside an automobile, we have a pressure chamber. Our bodies react differently to this LF - a pressure chamber is impossible to musically integrate! |
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