The dbx Quantum mastering processor represents dbx’s move from its established analogue expertise into the digital mastering domain, bringing together a complete chain of processing within a single unit. Designed as an all-in-one solution, the dbx Quantum consolidates multiple stages of mastering into a single digital processor, allowing detailed control over dynamics, equalisation and signal conditioning in one place. The concept follows the traditional mastering chain but integrates it into a flexible digital architecture with extensive parameter control and routing options.
At the core of the dbx Quantum is a multi-stage processing structure that allows the signal to be shaped in several different ways depending on the chosen configuration. Unlike simpler processors that follow a fixed signal path, the dbx Quantum provides three distinct signal path options, enabling the user to expand the scope of processing beyond a conventional stereo chain. One approach divides the signal into four bands using adjustable crossover points, allowing independent control of compression, limiting and gating across the frequency spectrum. This multiband configuration includes flexible 5-band equalisation that can be placed before or after the dynamics section, or within the dynamics side chain, offering a wide range of tonal shaping and control possibilities.
The dynamics processing within the dbx Quantum is particularly detailed, reflecting dbx’s heritage in this area. Compression, limiting and gating are all available, with the unit offering advanced control over parameters such as threshold, ratio, attack, hold and release. The familiar dbx OverEasy soft knee characteristic is extended here with multiple selectable variations, allowing precise tailoring of the transition into compression or limiting. Each band in multiband mode can be independently controlled, including its own threshold, gain structure and timing characteristics, as well as automatic attack, hold and release behaviours.
A notable feature of the dbx Quantum is its handling of limiting. The limiter operates in a multiband configuration and incorporates multiple levels of OverEasy behaviour, with the transition into limiting being variable rather than fixed. This allows the limiter to function not only as a protective stage but as an integral part of the overall dynamic shaping process. The design also allows the compressor to respond either before or after the signal reaches extreme levels, reducing unwanted side effects and providing more control over transient behaviour.
Equalisation within the dbx Quantum is comprehensive, with shelving filters at the top and bottom ends of the spectrum and three identical mid bands, each offering adjustable frequency, gain and Q. These bands can operate in either constant Q or adaptive Q modes and can be switched globally, providing flexibility for both broad tonal shaping and more precise adjustments. The equaliser can also be used within the side chain, allowing dynamic processing to be influenced by frequency-specific content.
The unit also includes additional processing blocks such as ambience control, stereo width adjustment and normalisation. The ambience section provides stereo image manipulation, while the stereo adjustment block allows control over the width of the signal. Normalisation is included to ensure maximum signal level before final output, and is positioned near the end of the signal chain before dithering and noise shaping.
The dbx Quantum is designed to operate at high resolution, supporting 24-bit, 96kHz processing with a 48-bit internal signal path. It incorporates dbx’s proprietary Type IV conversion system, allowing analogue signals to be processed while maintaining headroom and detail. The architecture ensures that only a single stage of dithering is required at the output, preserving signal integrity throughout the processing chain.
Control of the dbx Quantum is handled via a combination of front panel controls and menu-driven navigation. The interface includes a large display, multiple function buttons, and a central data wheel, allowing access to the unit’s extensive parameter set. Despite the complexity of the processing available, the system is designed to allow relatively quick adjustment and configuration once familiar with its structure. A Wizard function is included to assist with setup, guiding the user through configuration based on the type of material and desired processing intensity.
The dbx Quantum includes a substantial number of factory presets, with around one hundred programs covering a range of styles and applications. These presets demonstrate different processing approaches and combinations, including both stereo mastering chains and more specialised treatments for individual instruments. The system also supports user memories, allowing customised settings to be stored and recalled.
Digital processing tools within the unit include sample rate conversion and a bypass mode that allows true digital cloning. The unit also offers the option to dither only the digital output down to the required word length while maintaining full resolution internally. A high-pass filter is included on the digital inputs to remove DC offsets, along with independent level adjustments for each channel.
In operation, the dbx Quantum provides a wide range of control from subtle adjustments to more aggressive processing. The combination of multiband dynamics, flexible equalisation and additional processing stages allows it to handle a variety of mastering tasks within a single device. The design emphasises flexibility and control, with the ability to adapt the processing chain to suit different material and workflows.
Features
- All in one digital mastering processor combining multiple processing stages
- Three selectable signal path configurations for flexible processing
- Four band multiband dynamics processing with adjustable crossovers
- Compression, limiting and gating with detailed parameter control
- Multiband limiter with variable transition into limiting
- Five band equaliser with shelving and parametric mid bands
- Equaliser can be placed pre, post or within dynamics side chain
- Ambience control and stereo width adjustment
- Normalisation stage for final level control
- Type IV conversion system for analogue signal handling
- 24 bit 96kHz operation with 48 bit internal processing
- Wizard based setup assistance and factory presets
- Sample rate conversion and digital bypass mode
- Dither and noise shaping with selectable output word length
- High pass filter on digital inputs for DC offset removal