Preloved DEQX HDP-EXPRESS II - Black

Save $1,560

$2,690 $4,250


The Express II packs much of the new technology of our flagship HDP-4 Preamp Processor in a new, extraordinarily cost-effective design.

The Express II uses professional-grade components and power supplies but we've kept the price of the Express II down. By moving the front-panel controls to the remote while deleting the HDP-4's balanced analog and digital outputs for a simpler chassis.

Like its predecessor, the Express II provides DEQX InlineTM correction for your existing speakers, room and media. Plus, it does the impossible and precisely integrates one or a pair of subwoofers.

The Express II also supports 2- or 3-way active speakers for those opting for DEQX XOTM Active configurations with DEQX's linear-phase crossovers, now or in the future.

The Express II offers four hi-resolution digital inputs, accepting sample-rates including 24-bit/192k and two analog inputs (balanced XLR and single ended RCA) with 96k analog-to-digital conversion.

Measure (and correct) speakers first, then the room
In correcting the speakers-before the room-our comprehensive DEQX-CalTM 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.


Analog inputs and outputs



Full scale input level

17 dBu / 5.5 Vrms

9.3 dBu / 2.25 Vrms*1

Input impedance

50 kΩ

50 kΩ

Full scale output level

10.8 dBu / 2.7 Vrms*1

Output impedance

75 Ω

Total harmonic distortion


*1. Factory default setting. Jumper-settable, see User Manual for full details.

Digital audio inputs

TOSLINK (optical)

24-bit, 44.1 to 96 kHz


24-bit, 44.1 to 192 kHz, 75Ω


24-bit, 44.1 to 192 kHz


24-bit, 44.1 to 192 kHz, 110Ω

USB Audio

Asynchronous USB Audio Class 2, 24-bit, 44.1 to 192 kHz

Audio processing including HD-Active™

>td >

DSP resolution

Crossover slope

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

> 140 dB

*2. Maximum available slope subject to filter delay limits.

Payment & Security


Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

You may also like

Recently viewed