Relab QuantX Natural Resonance Reverb — Free Download

Authentic Recreation with Machine Learning

QuantX 2.0 is a precise recreation of a beloved 1980s hardware reverb, known for its realistic ambience and long tails. Relab used a next-generation machine learning framework to capture not just the static sound but the dynamic, evolving character of the hardware—including its quirks.

The plug-in includes two distinct algorithms: a pristine, factory-spec German unit and a time-worn US unit with an unstable crystal clock and aged components. A Temperature Control knob lets you morph between cold-start clarity and warm, hours-long-run tones. This dual-algorithm design gives you the precision of a restored machine and the unpredictable warmth of a heavily used one, all in real time.

Dual-Engine Design and Room Simulation

QuantX’s signature feature is its dual-engine reverb, combining two powerful systems, each with four outputs, that work in tandem. This allows real-time fine-tuning of reverb width and ‘front-to-back’ depth, so you can place sounds precisely in a mix—making them more present or pushing them back without excessive wetness.

Instead of relying solely on time-based reflection models, QuantX uses unique resonators to simulate how sound travels and interacts with a room. This frequency-based approach treats the room as an instrument, resulting in reverbs that feel integrated and natural. Seven room size options—from small spaces to massive halls—plus adjustable first reflections let you craft everything from subtle echoes to enormous tails while retaining clarity.

Enhance Mode and Modulation

Enhance mode is a standout feature that simulates a set of hyper-focused microphones capturing early reflections. It creates a sense of three-dimensional space with minimal reverb, adding depth without the muddiness that often accompanies long tails. This is ideal for adding presence and ‘front-to-back’ placement control to tracks without overwhelming them.

The hand-tuned Advanced Chorus Ensemble (ACE) provides 8-voice modulation, adding layers of depth and complexity to the reverb. Each voice is meticulously tuned and integrated into the algorithm, making the modulation feel like a natural part of the space rather than an added effect. This results in richer, more textured sounds that remain cohesive and musical.

Bandwidth Control and Practical Use

QuantX offers expanded bandwidth control, letting you adjust the frequency response from a natural roll-off at 4kHz up to 16kHz. This is achieved by recalculating the behavior of the original unit’s internal sample rate and analog filters, producing a unique resonant curve rather than a typical low-pass filter.

In practice, QuantX works well for adding realistic ambience to vocals, instruments, and mixes, especially when you need long, evolving tails without losing clarity. Use Enhance mode for subtle depth on individual tracks, or blend the two algorithms for a wide, immersive stereo image.

Key features

• Dual-engine reverb with four outputs per engine for real-time width and depth control
• Advanced machine learning captures the dynamic character and quirks of vintage hardware
• Two algorithms: pristine German and time-worn US, with Temperature Control for aging
• Unique resonator-based room simulation with seven room size settings
• Enhance mode for creating three-dimensional space with minimal reverb
• Hand-tuned 8-voice modulation (ACE) adds natural depth and texture
• Expanded bandwidth control from 4kHz to 16kHz with a custom resonant curve

Best for

QuantX is ideal for producers and mix engineers seeking authentic vintage reverb character with modern flexibility. It excels at adding realistic ambience to vocals, instruments, and mixes, particularly when you need long, evolving tails, precise placement in a mix, or the ability to switch between pristine and aged tones. Use it for cinematic sound design, pop, rock, and ambient music where depth and clarity matter.