The DEQX PDC-2.6
and 2.6P are the ultimate tools for do-it-yourself speaker designers
because it allows the best performance possible from any given design.
As a DIY speaker builder, you are in a position to either create a new DEQX-HD ‘active’ speaker
configuration from scratch, or modify an existing speaker design by
removing its old passive or active crossovers and then correcting each
driver’s time-domain performance, frequency-response, dispersion
and crossover distortion problems to a previously
impossible degree.
For
best results DEQX Calibrated™ technology should be implemented ‘actively’,
to provide DEQX-HD™ performance, where each driver has its
own amplifier. In addition to its speaker and room correction features,
the PDC-2.6 processor and PDC-2.6P processor/pre-amp, provide up
to 3-way linear-phase crossovers that can be used optionally to facilitate
active designs and/or seamless integration of mono or stereo subwoofer/s.
DEQX also provides detailed control over bass and its effects in
your room, which is measured and displayed, so that the correct
compensation can be applied. This allows bass to be better partnered
to the room, which becomes a major aspect of the bass we hear in any
event. For example, two subs placed in the front corners of a room
have improved efficiency and consequently less distortion. These can
be time-aligned to the main speakers that might typically be about
4 feet (approx 4 milliseconds) in front of each sub toward the sweet
spot in the room. This arrangement allows a high crossover frequency
to the main speaker (100Hz to about 250Hz) and a more coherent bass
wave-front compared with traditional floor-standing full-range speakers
where bass energy must also echo from rear and side walls.
In the above
example, by removing much of the ‘full-range’ speakers
bass responsibilities, you significantly lighten the load on its
amplifier, reducing it’s distortion, while simultaneously reducing
inter-modulation types of distortion of the speakers own bass/mid
drivers.
Very significant improvements are virtually assured using
the DEQX PDC-2.6, even if only to integrate one or two subwoofers
with passive speakers, but especially if the main speakers are a
two-way active configuration to provide DEQX-HD™ performance.
Time alignment between subs and the main speakers is incredibly important
and an often overlooked problem in many HI-FI and home-theatre environments.
DEQX Calibrated™ technology helps calculate the exact delay
required for the main speaker (or subwoofer) to provide phase coherent
integration.
The degree of control that the PDC provides for speaker
measurement, crossover and time alignment has not previously been
possible, even for professional studio monitor speakers. As if that
is not enough, the PDC-2.6 also provides room measurement and correction,
additionally the pre-amp version also provides 100-memory media correction,
a three-band parametric ‘tone control’ that can be tailored
to particular recordings, allowing you to set, store and recall from
the remote control.
Although implementing DEQX-HDrequires
more amplifiers, each ‘active’ amplifier
can be chosen for their ability to drive only several
octaves excellently rather then the traditional ‘heroic’ amplifier
that is expected to drive ten octaves, at full power, faultlessly – a
tall and/or expensive order. The reality is that by going active the
demands on each amplifier for an overall heroic outcome are diluted
across at least two or three frequency ranges of 3 to 5 octaves each.
This offers the advantage that amplifiers can be chosen on their merits,
such as high power and good damping for bass, and detailed resolution
but at less power for mid and high frequencies. Even if the same amplifier
design is used for each frequency band, its performance is enhanced
for each, being generally less stressed due to its limited power-bandwidth
load. |
