In DEQX terminology,
speaker correction requires anechoic or pseudo-anechoic (no
room reflections) measurement and correction. This means
that a speaker's amplitude (frequency response) and phase
accuracy can potentially be made perfectly accurate across
its full frequency band, which is impossible to achieve using
analogue technology.
DEQX Calibrated™ speaker correction targets
a 'flat' (on-axis) frequency response, which, when combined
with suitable room correction, is the reference standard
used by recording and mastering studios. Note that some
variations to flat are special cases. For example, a widely
used cinema EQ standard compensates for naturally occurring
high frequency losses due to distance in a commercial cinema.
DEQX Room Correction on the other hand is measured from
the listening position (multiple measurements can be made
for wide listening area), and so by definition includes room
acoustic effects, which can then be compensated.
Room effects
are usually most significant at low frequencies and in
the lower mid-range. Speakers are often critically dependent
on placement in a room. DEQX's room correction shows the
net effect at the listening position/s, allowing detailed
manual and automatic correction, which includes phase correction.
DEQX allows the user to set a number of target responses
using its 10-band parametric minimum phase equalization,
that is directly overlaid graphically with the actual before
/ after room measurements.
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