Bose approached the problem of the inescapable bass resonance in speakers by moving this up in frequency (to around 200Hz) and applying equalization to offset the normal 6dB/octave rolloff below resonance. And we are not convinced that this can yield as good performance as is obtainable from a system that needs little correctional boost or none at all.įig.3 Response curves (from one of Bose's blurbs for the 901) show the wide range of equalization contours available from the speaker's active equalizer.ĭr. The equalizer that is part of the 901 system offers a selection of response curves via several front-panel switches (fig.3), but even in the operating mode that is identified as having the flattest response, the speakers themselves are being fed rather substantial amounts of bass and treble boost. What bothers us about the 901, though, is the amountof compensatory boost that has been used, rather than the fact that it is used at all. Equalization of this kind is fine, of course, if only a small amount is needed to add the last nth degree of perfection (?) to a system, and if the loudspeakers can take it without swapping extended range for increased distortion. One of these is the use of electrical equalization to compensate for deficiencies in the speakers at the high and low ends of the audio range. There are two other things about the design of the 901 that we question, too.
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