Installation guide

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Compared to all other components in the audio recording, production, media and playback chain,
the mechanical nature of loudspeakers makes them extraordinarily prone to errors and distortion
that detract from realism. These include timing (phase errors) where numerous ‘groups’ of
frequencies lag behind others to varying degrees. Related to these are amplitude (volume) errors
that cause an inaccurate tonal balance that sound less ‘real’. These ‘linear-errors’: Group-delay
(phase-response) errors and Frequency-response errors, are described by the measured Impulse
Response of the speaker.
DEQX™ compensates the signal driving the loudspeakers prior to amplification, so the speaker
more closely resembles the original source signal. EQ, or equalization, has previously been
applied to loudspeakers to correct their tonal balance (frequency response), but the phase delays
added by traditional EQ are often significant enough to reduce timing coherence and hence
realism. The crossover filters used to ‘quarantine’ frequencies to their respective speaker drivers
(transducers) exasperate these timing errors unless they have ‘linear-phase’ performance, which
is not possible using the steep analogue filters required to provide good isolation between drivers.
DEQX compensates for frequency-response errors in fine detail based on measured errors.
Traditional analogue or DSP based attempts to correct frequency-response tends to be ‘broad
brush’, and introduce more timing and phase errors, which is why audiophiles often avoid using
“EQ”. DEQX uses ‘linear-phase’ EQ that not only does not introduce more timing/phase errors
when correcting frequency response, but it compensates for existing measured timing/phase
errors for hundreds of frequency groups by introducing a small window of time - in the order of
just about 10 to 15 milliseconds so that the audio will not loose synchronization with video if used
– to allow the ‘late’ frequencies can catch up.
Going ‘active’: In addition to correcting Impulse-response errors, some DEQX units (PDC, HDP,
and Express series) offer new generation ‘active’ crossovers that provide steep linear-phase
filters. DEQX units also measure and correct room related acoustic problems, and those supplied
with remote controls provide 3-band user definable tone controls including one fully parametric
band. Detailed ‘tone controls’ can be user-defined and saved to 99 presets.
In summary, using DEQX Calibrated™ EQualization, the measured erroneous characteristics of a
particular loudspeaker, or generic ‘model’ of a loudspeaker, are measured and corrected without
room reflections corrupting the measurement. When combined with DEQX Calibrated™ active
crossovers, each speaker driver can be better quarantined to operate within its more optimal
linear (low-distortion) operating region, resulting in improved resolution and accuracy and often
more natural sound dispersion in to the room . Once the ‘native’ (anechoic) performance of the
speaker is maximized, room acoustic problems are usually less problematic, but can be
measured and compensated in combination with pre-set personal preferences.
We highly recommend the use of the DEQXpert™ installation and training service.
Email: [e-mail] for more information.
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