DA, it's unclear what you mean by "loudness". Some(mostly old)equipment had a "loudness"(besides a volume)control which would increase the proportion of bass and treble to midrange when the volume control was at a low level. This is to counteract the Fletcher-Munson Effect, in which human ears are relatively less sensitive to bass and treble than to midrange sounds at lower sound levels.

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Enjoy the music, not the equipment.