| Why is it so difficult for subwoofers to blend
into a system?
Conventional powered subwoofers receive their input signal directly from their
crossover before the main amplifier. The sonic signature of the main amplifier that is an
important part of the sound you hear from the full-range speakers is missing from the
subwoofer. This causes blending and integration problems as the sonic characteristics of
the system are different above and below the subwoofer crossover point. This deterioration
of system coherence is why conventional subwoofers have never been totally accepted as
part of ultra high-performance audio systems. The second reason for a poor blend is that the main speakers do not have the bass
extension necessary for a linear transition. Basic filter theory dictates that the main
speakers must have predictable response at least an octave below the crossover point to
insure proper blending with the subwoofers. For an 80Hz subwoofer crossover point, the
main speakers must have predictable response to 40Hz or lower. This is why it is difficult
to successfully mate subwoofers with mini-speakers - the limited-range small speakers
simply cannot reach the required full octave below any reasonable subwoofer crossover
point. |