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DEQX HDP-5 Processor, Preamp & Dac

In stock

Roon Compatible

In Stock & Ready to Ship.

DEQX’s flagship HDP5 is a new concept pre-amplifier that adds touch screen display and Internet connectivity to HDP4’s reference loudspeaker and room calibration features.

The HDP5 provides transparent analogue pass-through and superb DAC performance while correcting measured errors in loudspeaker performance and compensating for room acoustics.

Now includes DEQX XS-1 USB Audio Board For Macs or PCs

HDP5 delivers a range of scenarios targeted to your requirements

‘Room Calibration’ delivers great results using simple measurement techniques if you’re happy with your loudspeaker performance.

‘Loudspeaker Calibration’ uses more detailed measurements of your speakers. This is used for detailed phase-response and frequency-response correction, particularly for midrange frequencies where correction is particularly beneficial to restore realism.

Numerous input options include state of art USB:

HDP5 comes with a high definition USB input that has received highest accolades from professional and audiophile reviewers. It utilizes a dedicated DSP to re-buffer and re-clock data to ensure a jitter free source. This feeds directly to HDP5’s Dual-DSP calibration engine without conversion to-or-from S/PDIF.

Six additional inputs include:

digital S/PDIF Toslink optical



Analogue XLR balanced

RCA unbalanced.

Analogue inputs utilize Cirrus Logic’s reference ‘professional’ ADC (Analogue-to-Digital converter) to provide absolute transparency for analogue sources such as vinyl preamps, analogue sources and surround receivers. A phantom powered DEQX-Calibrated measurement microphone is also provided.

Remote and Tone Control:

The remote provides volume, input selection and DEQX’s 3-band ‘forensic’ tone control with 99 memories.

The three bands have adjustable frequency and Q (bandwidth from semitone to four octaves wide), while the ‘center’ band is fully parametric spanning all frequencies. Applications include specific media EQ, low volume listening and personal preference settings. Four ‘Profile’ settings can also be selected, each allowing different speaker and room calibrations to be stored from DEQX-Cal setup software (with PC connected at time of setup) for instant recall.

Touch screen and Internet:

HDP5’s attractive 4.3” touch-sensitive intelligent display is driven by a 1GHz ARM CPU to allow future Internet connectivity and software upgrades.

The touch screen has several display pages for customized control options including volume, analogue metering, selection of input source, and calibration and EQ profile selection.

Dual SHARC 32-bit floating-point DSPs:

Transparent audiophile quality throughout is provided by dual SHARC 32-bit floating-point DSPs providing greater than 140dB resolution followed by three Burr-Brown 32-bit DACs. Ten separate power-supply regulation stages deliver extremely low measured distortion and jitter for fatigue-free listening.

The Method

Other "room correction devices" simply adjust amplitude response – uneven output at different frequencies – to offset room modes. But they don't address phase or group-delay timing issues that exist in all real-world speakers. 

DEQX processors are unique… they address the shortcomings of the speaker first via direct measurement, and then apply corrected digital filtering. Once the speaker is working accurately the HDP-EXPRESS and HDP-3 measure again and provides room compensation for your newly-corrected speakers.

Think of them as Pre-Amp Processors that measure your speakers and apply sophisticated correction filters. There are two ways to DEQXify. DEQX Inline works with your stereo amplifier and speakers as a complete package, also called a passive setup. In a typical audio system you might use the six available DSP channels to optimize a 1-way, a 1-way plus sub(s), a 2-way, or a 2-way plus sub(s) system.

A popular home theater setup is a single DEQX Inline to integrate, correct and time align one or a pair of subwoofers with main Left and Right speakers, and then adds room compensation and Preference EQ. A remote control for a 3-band equalizer with one fully parametric band adjustable across ten octaves makes fine tuning easy.

DEQX Inline’s powerful DSP technology is transparent to the speaker’s internal crossover and measures the cumulative output of your speakers and corrects for amplitude balance (frequency response), phase, group-delay and timing errors thus vastly improving the immersive experience.

When you DEQXify and lower intrinsic distortion and add room compensation the presentation changes in an instant as the sound becomes startlingly more coherent. You’ll experience a surprising sense of realism that makes suspending disbelief and fully engaging with music or video easy.

DEQX XS-1 USB Audio Board

DEQX XS-1 24/192 Asynchronous USB board.

This digital input board allows you to connect your DEQX directly to your Windows or Mac based music servers.

If you use a music server, this is the best sounding way to get sound into your DEQX!

USB Board Features:

16/44 - 24/192 Asynchronous

No 5v power connection to computer; powered internally from ultra clean DEQX power supply.

I2S interface to eliminate conversation to SPDIF and reduce jitter.

Interdependent regulated clocks.

No drivers required for Macintosh OSX.

Windows Drivers supplied for XP, Vista, Windows 7, Windows 8 32 & 64 bit.

DEQX HDP firmware update supplied on disc.

Easy to install, just one plug.

Need more bass?

A popular way of configuring DEQX’s active crossover options is to simply add one or two subwoofers to existing speakers. All can be calibrated and time aligned with room calibration.

Going ‘active’ option:

HDP5 also offers full 3-way active crossover features not offered by sister products PreMate and PreMate+.

Upgrade your speakers to another level of performance now or in the future using HDP-5’s ‘HD-Active’ crossover outputs that introduced a new generation ‘active’ speaker regime. The three sets of ‘active’ outputs; bass, mid and high, drive separate amplifiers each for bass, mid and tweeter drivers.

Choose the best amplifier suited for bass, mids and high frequencies. For example, a priority for bass is high power. The midrange driver need moderate power but good detail. While Tweeters may only need 10 watts of rich detail where even tube amps and A-Class amps are affordable.

Professionals have used ‘active’ speakers for decades because they deliver high dynamics with lower distortion and greater accuracy than passive speakers. HDP5 new generation ’HD-active’ regime improves on traditional analogue and DSP active crossovers with steep linear-phase crossover filters that incorporate individual driver calibrations. This preserves each driver’s linearity, or native resolution, by better quarantining frequencies to its ‘comfort zone’.

Thinking DIY?

DIY speaker design was never like this! HDP5’s 3-way active crossovers allow active 2-way speakers to be integrated with subs, or 3-way speakers can be implemented actively using custom designs or upgrading existing passive speakers to active.

HDP5 and its DEQX-Cal software provides the same measurement features that the best speaker designers use. DEQX can directly compensate what’s going wrong so that what you ‘hear’ is as close to the original source as possible.

DEQX-Cal is half a million lines of software designed by DEQX’s award winning engineers over fifteen years and provides DIY’s with a risk free environment where numerous design options can be instantly auditioned and compared. Save months of traditional speaker design work where results will outperform traditional techniques.

Use our DEQXpert on-line service for DEQX-Cal DIY tips and training, or we’ll do it for you.

DEQX technology - realizing HD-Audio:

DEQX’s patented, very low latency convolution processing corrects speaker frequency-response and timing errors by adjusting thousands of frequency groups, depending on your speakers’ measurements, so that they not only arrive at the correct volume, but also on time.

Going further, DEQX’s HD-Active regime offers hope of achieving a playback environment that comes closer to actually hearing the content of new HD media. Today’s loudspeakers remain passive and uncompensated, dating from the same era as CRT TVs.

As a result, today’s so called ‘HD-Audio’ is akin to watching an HD BluRay video on a twenty year old CRT Screen. Yes it will look slightly better, but inherently limited by the resolution and accuracy that CRTs can fundamentally deliver – we needed new technology HD-displays and projectors to ‘get real’.

With loudspeaker distortion around 1%, to name just one alarming parameter, its resolution is limited to 40dB, whereas the amplified signal driving the speaker is closer to 80dB and typically more.

Loudspeakers’ phase-response and frequency-response is decimated by ‘HD-audio’s amplified signal. In other words, frequencies do not arrive to our ears either at the right volume or the right time specified by our recordings. Taken to full implementation DEQX addresses all of these issues directly and indirectly.

The timing coherence accuracy that DEQX restores is often the most expensive design feature of loudspeakers. Normally, loudspeakers have no way to compensate errors via the signal driving them; so expensive engineering is used to minimize these errors and distortions. DEQX uses real computing horsepower to make that happen with essentially zero distortion and minimal processing delay so audio remains in sync with video.


A DEQXpert agent can run the comprehensive DEQX Cal™ software for you on a secure, remote connection for a surprisingly affordable price. You’ll need a simple USB link to your PC (or Mac running Windows) using a measurement microphone and a broadband connection.

Or, if you prefer to calibrate it yourself, we can lend a hand via email or phone with tips and directions on getting the best from your setup.

Stereo Inputs  

RCA unbalanced, XLR balanced


Toslink, S/PDIF BNC, S/SPIF RCA, AES3 XLR, USB (now included)

Stereo Outputs  

Low, Mid (or full-range), High: RCA unbalanced and XLR balanced


Low, Mid (or full-range), High: S/PDIF BNC

Digital thru:


Measurement mic input:

XLR balanced with 48V phantom power

Mains input voltage:

Auto select 115 V-230VAC, 5-60HZ

Power Consumption: 50VA


Height: 2U / 97mm

Depth: 325mm

Width: 430mm


Dual Analogue Devices SHARC 32-bit floating point

Analogue input maximum levels  

+17 dBu differential

Input impedance (balanced and unbalanced):

50 kohms

Analogue output (jumper set) maximum levels  
Balanced maximum level:

+21 dBu differential

Unbalanced maximum level:

+15 dBu differential

Total harmonic distortion:

<0.0008% (analogue-analogue)

PC connections:


Crossover slope (software selectable):

Up to 300dB/octave


From 2.5ms, typically 15ms with speaker correction filters (video sync OK)


Display 4.3" 480x270

ARM A8 1GHz DEQXlinux

Ethernet and USB

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