DEQX Calibrated™ is an audio
correction process that improves sound clarity by correcting
measured errors in loudspeakers, as well as those caused
by the loudspeaker's interaction with a room's acoustics.
It is used for consumer and professional audio.
A DEQX Calibrated™ loudspeaker indicates
that its accuracy and transparency with regard to frequency
response, phase linearity, time alignment, group delay and
crossover distortion are likely to be dramatically improved
over its analogue equivalent.
A
DEQX Calibrated™ processor such as the DEQX PDC-2.6 can
be used to measure and correct room effects (DEQX Room Correction)
by measuring and correcting phase and amplitude to enhance
clarity, especially for bass frequencies.
For professionals,
DEQX Calibrated™ correction offers the most accurate monitoring
possible. Installations include industry benchmark facilities
such as the Abbey Road studios in London and Technicolor's
Sunset and Gower film mixing facilities in Hollywood.
Uniquely,
the DEQX Calibrated™ process simultaneously corrects speakers
'anechoically' or 'pseudo-anechoically' (DEQX Speaker
Correction) meaning the natural or native resolution of the
speaker is corrected in fine detail before room effects are
taken into account.
DEQX Speaker Correction is necessary
to correct group delay, phase and amplitude through the
mid-range and high frequencies where measurements made
for room correction are unsuitable. The unit offers further
options such ten-band parametric equalization for user
preference settings and volume control, enabling use as
a Preamp.
The DEQX PDC-2.6 processor with the DEQX Calibration
Kit allows separate measurement of the room and the speaker
without requiring an anechoic chamber. It can provide speaker
and room correction to existing speakers, or can provide
DEQX's digital crossovers to existing or do-it-yourself
active designs where separate amplifiers are assigned to
each driver. DEQX also provides customized OEM processing
modules for manufacturers.
DEQX PDC-2.6 Applications
The PDC-2.6 can be used for partial or full correction
of audio systems as follows:
1. In its simplest
implementation, the PDC-2.6 provides a ten-band digital parametric
equalizer for room correction and detailed user defined equalization.
The unit can also be used as a very high quality DAC with
internal analogue volume control. A calibrated microphone
input with phantom power is provided for measuring the
room, with the resulting graphs shown overlaid with the
parametric settings for before and after comparisons.
2. For
more advanced correction, the PDC 2.6 is also capable
of DEQX Speaker Correction, which involves pseudo-anechoic
measurement and correction of complete speaker systems.
Speakers can be measured in the listening room using DEQX's
recommended measurement procedure that eliminates sound reflected
from the room. This allows the speaker's frequency response
and phase to also be corrected.
3. For ultimate
performance of any speaker it is necessary to 'go active'
by using the DEQX Digital Crossovers (as provided in the
PDC-2.6) with suitable amplifiers for each driver. This
is ideal if you are able to make your own loudspeakers or
can bypass passive crossovers in your existing speakers.
If you have bi-wireable speakers (with internal passive crossovers),
the PDC-2.6 can add steeper crossover slopes and/or time
align drivers. Note that in this instance distortion effects
introduced by the passive crossovers cannot be corrected
and the crossover frequency should not be changed.
4. The
PDC can be used to create an acoustic model of the room
and to also automatically correct both phase and amplitude
in the lower several octaves. In the mid-range and highest
frequencies it is not practical to correct phase using
a room measurement (i.e. from the listening position) due
to the localization of the response in space. (NB. Automated
room modeling with phase correction is a free software
upgrade due in early 2003.) In some cases room modeling may
not be as desirable for room correction as a more simple
graphic style of automated equalization, which is also provided
with DEQX's automated room correction.
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