The paper will deal with some open problems of low-frequency sounds reproduction, particularly in medium and small listening rooms. First, the basic facts and terms concerning sound fields and transfer functions in bounded spaces will be briefly recalled. Specifics of sound quality perception at low frequencies will then be outlined. Opinion differences in this field will be discussed too. Strong influence of the test signals properties is stressed, and using both musical, and artificial test signals for low-frequency listening tests recommended. Several examples of different artificial low-frequency test signals will be described, demonstrated, and compared with musical signals. (Samples of such test signals are available in MP3 format free on request.)
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