DEQX For Audio Professionals and Studios

DEQX for audio professionals and studios

DEQX Calibrated™ processing corrects frequency-response and time-domain errors in your
passive or active monitor speakers and measures and corrects room anomalies. The PDC-2.6
and PDC-2.6P (Preamp version) provides a 2-input processor, that can also provide stereo 3-way
active crossovers incorporating DEQX's steep linear-phase crossovers. Alternately you can use the
PDC-2.6 to correct any two main speakers and use the ‘Low’ frequency crossover output/s to provid
e properly integrated and time-aligned mono or stereo subwoofers.

To achieve DEQX-HD (High Definition) Calibrated™ speaker performance it is necessary to correct frequency-response and the timing errors caused by group-delay and time-alignment in conjunction
with relatively steep linear-phase crossovers. This virtually eliminates crossover distortion. Individual
driver distortion is also reduced by ensuring that each driver is only working in its ideal operational
zone, something that shallow passive crossovers rarely allow.

Drivers distort less and play louder when acoustic energy for each driver is better quarantined.
DEQX-HD facilitates this with linear phase filters up to 300dB/octave.

Less distortion means less listening fatigue; essential for the modern audio engineer who spends
long hours listening for the finest of details at loud levels. Studio professionals that use DEQX
Calibrated™ technology often wonder how they ever lived without it.

Freelance engineers can take a PDC (2Kg, 1 rack unit high) with them to studios rather than large
and heavy speakers. Not only will it correct any speaker response problems, it can compensate for
room discrepancies too, allowing for unheard of consistency from studio to studio, facility to facility.
Connection is a breeze, simply insert the PDC in the monitoring chain before the amplifiers, it really
is that simple.

DEQX-HD’s steep filter slopes allow lower crossover frequencies to be chosen whereby bass/mid
drivers do not get a chance to ‘beam’ or output ‘muddy’ high frequencies causing an unnatural
reduction of highs off-axis. A further benefit is greater sound pressure levels (SPL), the degree
depending on how low crossover frequencies are. Typically crossover frequency/s can be reduced
by one-half to one-octave using DEQX-HD; now that’s flexibility.

Inputs to the PDC-2.6 are 2-channel analogue (both unbalanced and balanced are standard) and
digital (both AES/EBU and S-PDIF are standard). Processing is done with 40-bit floating point
precision, and with the I/O being 24-bit 44.1 kHz to 96 kHz you can be assured of true professional
sonic quality. Since all outputs normally go directly to amplifiers, standard outputs are unbalanced analogue (RCA) with optional XLR balanced, XLR/RCA digital, or both (in the latter cased a 2-U high
rack units is provided).

For existing single channel active or passive monitors, the PDC-2.6 can also be used to seamlessly
integrate subwoofers with main speakers. This allows delay to be provided to the main speakers so
that they are properly time-aligned to the subwoofers, a very important but often overlooked issue.

The PDC-2.6P (preamp version) includes a remote volume control and post-DAC analogue volume
control of all outputs to maintain full digital resolution when monitoring at low volume.

For surround systems such as 5.1, three PDC-2.6 units would be used since each unit processes
two input channels. PDC units are available with 19” rack mounting hardware.

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