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14.00 KGS

Product Description


Master the art of timing 
DEQX processors correct the distortion that all speakers make—electro-mechanical devices that they are—and offer room compensation as an added extra. While righting frequency-response errors as other units do, they also uniquely fix critical timing errors by adjusting thousands of frequency groups so that they arrive on time.

Other ‘room correction devices’ simply adjust amplitude response (uneven output at different frequencies) to offset room modes. But they can’t address the fine details of phase coherence; the group-delay timing issues that manifest in all real-world speakers.

The results are startling; two-channel and surround systems open up in a dramatic way when timing, phase and amplitude accuracy are restored to the speakers, with judicious room compensation added.


The HDP-4 can be installed between your preamp and amplifier or more directly used as a preamp processor.

It accepts up to 24/176.4 and 24/192 digital inputs and now supports TOSLINK in, plus an optional USB input module. Stereo digital and analog inputs include SPDIF, AES/EBU, unbalanced analog and balanced analog.

The HDP-4 comes standard with many output options such as SPDIF on 75 ohm BNC connectors, with another digital output configured as a DSP Input Pass-Through for connecting selected inputs for further processing. Additionally, it includes balanced and unbalanced analog outputs.

Audiophile quality throughout, the HDP-4’s balanced and unbalanced analog inputs are built around highly transparent analog-to-digital converters (ADCs) running at 24-bit/96kHz resolution. Two SHARC 32-bit floating-point DSPs provide internal processing resolution greater than 140dB, followed by 24/96 digital-to-analog converters (DACs). Nine separate power-supply regulation stages deliver extremely low measured distortion for fatigue-free listening.

And it also does the impossible by precisely integrating one or a pair of subwoofers into your system while supporting 2- or 3-way active speakers for those opting for DEQX XO™ Active configurations, now or in the future. 

Measure (and correct) speakers first, then the room 
In correcting the speakers—before the room—the comprehensive DEQX-Cal™ software generates correction filters for phase, timing coherence and frequency-response. Only then does DEQX-Cal measure from the listening area for room correction. 

DEQX technology is unique 
It corrects speaker frequency-response and timing errors by adjusting thousands of frequency groups, depending on your speakers’ measure­ments, so that they arrive at the correct time.

Traditional analog and digital EQ corrupts the timing coherence around the frequencies that they’re trying to equalize for volume. DEQX Processors slow down on-time and early-arriving frequencies so that slower frequencies can catch up.

That just can’t be done in the analog domain!

DEQX uses real computing horsepower to make that happen with a 240-megaflop, 32bit floating-point Digital Signal Processing Engine that essentially achieves zero distortion.

Calibrate speakers first then the room the comprehensive DEQX Cal™ software generates correction filters for phase, timing coherence and frequency-response. Only then does DEQX Cal measure from the listening area for room calibration.

Your dealer or DEQXpert™ on-line installation service drives the set-up software for you. All you have to do is connect up the unit much like any preamp-DAC, then set up the calibrated microphone to measure the speakers then your room as we suggest during the live DEQXpert hook-up. The processor computes the precise calibration for your particular system and room; there’s never been a preamp like this!

For more in-depth product info and discriptions please visit the DEQX website http://www.deqx.com/product-hdp4-overview.php


How to install

Download PDF


Tech Specs


Two stereo analog inputs: Unbalanced (2 x RCA) and Balanced (2 x XLR)

Four stereo digital inputs: S/PDIF (1 x RCA, 1 x BNC), AES/EBU (1 x XLR), Optical Toslink

Digital inputs are 24/192 capable

Asynchronous 24/192 USB input board now included as standard

2U high chassis: 3.5" H x 17" W x 11.5"

Six analog outputs: unbalanced (6 x RCA), balanced (6 x XLR), configurable output levels via internal jumpers

Digital post DSP outputs: yes, SPDIF (BNC), all channels
Digital pass through: yes, SPDIF (BNC)

24-bit 96kHz reference class Cirrus Logic ADC

32-bit 192kHz Burr Brown PCM1795 DACs

32-bit, floating-point, 240-MFLOPS processing with dual Analog

Devices SHARC DSPs

Audiophile op-amps with 300V/uSec slew-rate and high current drive

Included remote control allows control of volume, profile, input and setting of preference EQ

Microphone input has 48V phantom power

115V-230VAC switchable mains input, 100V-200V Japan only option

In the box:


DEQX Calibration Software (runs on Windows XP / Vista / 7 / 8

including 64 bit operating systems)

Remote Control

Calibration Kit including calibrated Dayton Audio EMM-6 microphone, microphone and USB cables

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