Legacy Products

Here at DEQX, we pride ourselves on our commitment to long-term support of our products. The DEQX-Cal software is compatible with all DEQX processors from the HDP-3, HDP-4 and HDP-5, and back to the original PDC-2.6, and many original DEQX processors have been in the field for well over two decades and continue to be used daily.

PDC-2.6

Generation 1

2003-2015

The original DEQX processor that introduced FIR-based speaker correction and 3-way DEQX-Active crossovers for Pro-Audio applications, including Abbey Road studios for multichannel mastering.

Key Features:

  • First FIR-based speaker correction
  • 3-way DEQX-Active crossovers
  • Professional audio applications
  • Multichannel mastering capability

HDP-3

Generation 2

2008-2018

First Audiophile preamp processor with speaker calibration and room correction. High-Definition Preamp with advanced room correction and speaker calibration.

Key Features:

  • 24-bit/192kHz processing
  • Digital room correction
  • Speaker linearization
  • Multiple input options

PreMate

Generation 3

2015-2023

Compact DEQX processor designed for ease of use while maintaining exceptional performance and speaker calibration capabilities.

Key Features:

  • Simplified user interface
  • Full speaker calibration
  • Room correction
  • Compact form factor

HDP-4

Generation 3

2015-2023

Premium High-Definition Preamp with enhanced processing capabilities. Audiophile-focused platform that gained critical acclaim as analog transparency improved.

Key Features:

  • Advanced DSP processing
  • Balanced XLR outputs
  • USB and network connectivity
  • Comprehensive calibration suite

HDP-5

Generation 3

2015-2023

Flagship High-Definition Preamp with ultimate performance. The pinnacle of Generation 3 technology with reference-grade components.

Key Features:

  • Highest resolution processing
  • Premium analog stage
  • Full digital and analog I/O
  • Professional calibration tools

PreMate+

Generation 3

2015-2023

Enhanced version of the PreMate with additional features and improved performance for demanding audiophile applications.

Key Features:

  • Enhanced processing power
  • Expanded connectivity
  • Advanced calibration features
  • Premium components

Need Support for Legacy Products?

We continue to provide support and documentation for all our legacy products. Visit our legacy support page for downloads, manuals, and firmware updates.