The classic DEQX configuration, with a full set of analog and digital I/O. For stereo or HD-Active.


5 digital inputs

2 analog inputs

Speaker correction

Subwoofer integration

Room correction

Balanced outputs

Digital "thru" output

High/mid/low digital outputs

Remote control

$4495 USD

After clicking "Order HDP-4," you will be able to choose front panel color and other options.

Pricing in USD, not including freight, import duties and charges, or taxes. Authorised dealers may offer pricing in your local currency.

What's included

DEQX hardware unit

Your ordered DEQX hardware unit. Every single DEQX unit is individually tested before leaving the factory.

Calibration kit

A Standard Calibration Kit is included with every DEQX. The Reference Calibration Kit is an optional upgrade.

Software USB stick

Includes the DEQX-Cal™ installer, microphone calibration files, and a PDF version of the user manual.

Rear panel - HDP-4 SMPS

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 and HDP-4?

The HDP-4 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 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-4 is a superset of the PreMate. To use with conventional passive speakers, connect the power amplifier to the Mid/Full outputs (RCA, XLR, or digital).


Analog inputs and outputs
Full scale input level17 dBu / 5.5 Vrms9.3 dBu / 2.25 Vrms*1
Input impedance50 kΩ50 kΩ
Full scale output level17.4 dBu / 5.7 Vrms*110.8 dBu / 2.7 Vrms*1
Output impedance600 Ω75 Ω
Total harmonic distortion0.0008%0.0008%
*1. Factory default setting. Jumper-settable, see User Manual for full details.
Digital audio inputs
TOSLINK (optical)24-bit, 44.1 to 96 kHz
S/PDIF (BNC)24-bit, 44.1 to 192 kHz, 75Ω
S/PDIF (RCA)24-bit, 44.1 to 192 kHz
AES/EBU (XLR)24-bit, 44.1 to 192 kHz, 110Ω
USB AudioAsynchronous USB Audio Class 2, 24-bit, 44.1 to 192 kHz
Digital audio outputs
Digital Through24-bit, 96 kHz S/PDIF on 75Ω BNC connector. Same as selected input, with no filtering or gain applied. Used for master-slave confgurations.
Digital Low24-bit, 96 kHz S/PDIF on 75Ω BNC connector. Follows analog "Low" speaker output (with filtering and gain).
Digital Mid24-bit, 96 kHz S/PDIF on 75Ω BNC connector. Follows analog "Mid" speaker output (with filtering and gain).
Digital High24-bit, 96 kHz S/PDIF on 75Ω BNC connector. Follows analog "High" speaker output (with filtering and gain).
Audio processing including HD-Active™
Crossover slope48 to 300 dB/octave (linear phase)
6 to 96 dB/octave (Linkwitz-Riley and Butterworth)
Crossover frequency22 to 18,340 Hz
Amplitude correctionBetter than 0.2 dB, typical (depends on measurement accuracy)
Group delay correction0.5 ms, typical (depends on measurement accuracy)
Subwoofer crossoverFrom 6 Hz, 24 to 120 dB/octave*2
Processing latencyTypically 15 ms depending on filters, minimum 2.5 ms
Room EQSeven or ten bands, 1 Hz to 48 kHz, −300 to +40 dB, Q 0.01 to 17
Preference EQThree bands, 20 Hz to 20 kHz, gain to +/−9 dB, Q 0.5 to 10
DSP resolution> 140 dB
*2. Maximum available slope subject to filter delay limits.

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