HDP-Express II

Our entry-level HD-Active processor. For professional/OEM speaker development and DIY speaker builders.

4 digital inputs

2 analog inputs

HD-Active crossovers

Subwoofer integration

Room correction

Remote control

$2995 USD

After clicking "Order HDP-Express II," you will be able to choose 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.


What is the difference between the HDP-Express II and the HDP-4?

The HDP-Express II doesn't have balanced or digital outputs and the analog circuits use slightly less "audiophile grade" components. In addition, the front panel buttons are not provided (use the remote control or DEQX-Cal).

Does the HDP-Express II have a USB Audio input?

The standard version of the HDP-Express II does not have the USB Audio input. This is because it is often used for speaker development and as a slave unit in more complex systems. However, you can add the USB input as an option when you order. It does have four digital and two analog inputs as standard.

Is the audio processing any different?

The HDP-Express II has identical digital processing to the more expensive units, with the same features and specifications.

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

Yes! To use with conventional passive speakers, simply connect the power amplifier to the Mid/Full outputs.


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 level10.8 dBu / 2.7 Vrms*1
Output impedance75 Ω
Total harmonic distortion0.0008%
*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
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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