Loudspeakers
are typically accurate to within plus and minus 3dB (6dB
range) from around 50Hz to 20kHz. A 6dB range means that
the loudest frequencies are four times louder in power
than the quietest frequencies (i.e. 25 Watts versus 100
Watts).
Acknowledged errors
within a 6dB range of frequency response (and consequent
phase errors) are unthinkable in a microphone, Preamp,
amplifier or CD player. However we accept that a speaker's
mechanical and cabinet behavior is beset by design
and production variables, whereby plus/minus 3dB is about
as good as is gets using analogue techniques.
DEQX
measures these errors then digitally compensates the signal
going to the speaker in real-time, so that the individually
processed inverse error signal sounds accurate to less
then one decibel across the intended frequency range when
played back.
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