DEQX HDP-5 preamp processor

In Stock

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

Main Features

  • 5 digital inputs
  • 2 analog inputs
  • Speaker correction
  • Subwoofer integration
  • Room correction
  • Balanced outputs
  • Digital "thru" output
  • High/mid/low digital outputs
  • Remote control
  • Touch-screen control
  • Roon Ready
  • DLNA network streaming

Room Calibration

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 HDP5s Dual-DSP calibration engine without conversion to-or-from S/PDIF.

Six additional inputs include:

  • digital S/PDIF Toslink optical
  • S/PDIF BNC and RCA
  • Analogue XLR balanced
  • RCA unbalanced

Analogue inputs utilize Cirrus Logics 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.

DEQX HPD-5 back panel

Remote and Tone Control:

The remote provides volume, input selection and DEQXs 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 the time of setup) for instant recall.

Touch screen and Internet:

HDP5s 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.

Calibration Kit

The Standard Calibration Kit is included with every DEQX and includes a Dayton EMM-6 measurement microphone. The Reference Calibration Kit is an optional upgrade and features an Earthworks M-23 calibrated measurement microphone.

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 because they first address the shortcomings of the speaker 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. Youll 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 and 64 bit.
  • DEQX HDP firmware update supplied on disc.
  • Easy to install, just one plug.

Need more bass?

A popular way of configuring DEQXs 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-5s 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 needs 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 analog and DSP active crossovers with steep linear-phase crossover filters that incorporate individual driver calibrations. This preserves each drivers linearity, or native resolution, by better quarantining frequencies to its comfort zone.

Thinking DIY?

DIY speaker design was never like this! HDP5s 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 provide 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 DEQXs award-winning engineers over fifteen years and provides DIYs 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 well do it for you.

DEQX technology - realizing HD-Audio:

DEQXs 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, DEQXs 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.

Loudspeaker phase-response and frequency-response are decimated by the amplified signal of hi-res audio. 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. Youll 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.

Frequently Asked Questions

What is the difference between the HDP-4 and the HDP-5?

Compared to the HDP-4, the HDP-5 has a display/control touchscreen on the front panel, an Ethernet port for network audio streaming (Roon and DLNA), and 12V trigger outputs.

What is the difference between the PreMate Plus and HDP-5?

The HDP-5 has an additional set of analog outputs for high-frequency drivers, so it can be used in HD-active configurations i.e. bi-amp and tri-amp. It also has a full set of digital outputs for connecting external DACs (the PreMate Plus has only one, for the main speakers). Finally, it has an unfiltered digital "through" output for use in master-slave configurations.

Can I use it with full-range (passive) speakers?

Yes! The HDP-5 is a superset of the PreMate Plus. To use with conventional passive speakers, connect the power amplifier to the Mid/Full outputs (RCA, XLR, or digital).


Technical Features

Analog Inputs
RCA unbalanced, XLR balanced
Digital Inputs
Toslink, S/PDIF BNC, S/SPIF RCA, AES3 XLR, USB (now included)
Analog Outputs
Low, Mid (or full-range), High: RCA unbalanced and XLR balanced
Digitial Outputs
Low, Mid (or full-range), High: S/PDIF BNC
Digital thru
2U / 97mm H x 325mm D x 430mm W
Dual Analog Devices SHARC 32-bit floating point
PC connections
4.3" (480x270) Touch-screen
ARM A8 1GHz DEQXlinux
Ethernet and USB


Analog input maximum levels
Balanced: +17 dBu differential
50 kohms Input impedance (balanced and unbalanced)
Analog output (jumper set) maximum levels
Balanced: +21 dBu differential
Unbalanced: +15 dBu differential
Measurement mic input
XLR balanced with 48V phantom power
Mains input voltage
Auto select 115 V-230VAC, 5-60HZ
Power Consumption: 50VA
Total harmonic distortion
<0.0008% (Analog-Analog)
Crossover slope (software selectable)
48 to 300 dB/octave (linear phase)
6 to 96 dB/octave (Linkwitz-Riley and Butterworth)
Crossover Frequency
22 to 18,340 Hz
Amplitude correction
Better than 0.2 dB, typical (depends on measurement accuracy)
Group delay correction
0.5 ms, typical (depends on measurement accuracy)
Subwoofer crossover
From 6 Hz, 24 to 120 dB/octave*2
Processing latency
Typically 15 ms depending on filters, minimum 2.5 ms
Room EQ
Seven or ten bands, 1 Hz to 48 kHz, −300 to +40 dB, Q 0.01 to 17
Preference EQ
Three bands, 20 Hz to 20 kHz, gain to +/−9 dB, Q 0.5 to 10
DSP resolution
> 140 dB

Package Includes

  • DEQX HDP-5
  • Software USB Stick
  • Standard Calibration Kit
    (Upgradeable to Reference Kit)