Of course you do. By effect of subjective loss of low frequencies (from 20 to approx. 500-700 Hz) while listening at levels lower than the “original” sound pressure levels of the same sound source heard “natural”. And subjective excess of low frequencies while listening at levels higher than the “original” sound pressure levels of the same sound source heard ‘natural’, on the other hand. The bigger the “natural” and the “electro-acoustical” sound pressure levels difference, the deeper the effect. The subjective loss or excess of low frequencies is, in itself, an objective property of human hearing. The effect described by the “equal-loudness contours'', if you are curious to see the latest version of (and the history of versions): http://www.lindos.co.uk/cgi-bin/FlexiData.cgi?SOURCE=Articles&VIEW=full&id=17 The means to compensate the effect, whenever wished, are the well-known “loudness” devices, but not to forget that millions of “loudness” buttons of millions of “popular” preamps “prevent” their owners from adjusting to the real difference of the SP levels mentioned above, even being designed for only ONE “side” of the compensation, i.e. for listening levels LOWER than “natural”, their “loudness curves” being rigidly attached to “volume” knob’s positions producing absolutely unpredictable SP levels of any sound source listened, except for rare cases of coincidence. The other “side” of the compensation, i.e. for listening levels HIGHER than “natural”, does not exist at all in “popular” equipment.