All Clear Audio Symphony One Pre-amplifier

Allclear Audio Symphony One 

Product Overview

The Allclear Audio Symphony One is a high-end purist passive preamplifier designed for listeners who value absolute signal transparency and uncompromised musical fidelity. Rather than relying on traditional active gain circuitry, the Symphony One uses an advanced Transformer Volume Control (TVC) architecture to preserve the integrity of the incoming audio signal while delivering exceptional dynamics, resolution, and tonal purity.

Built around custom-wound Super Permalloy transformers and an ultra-clean isolated control system, the Symphony One eliminates many of the coloration, distortion, and noise artifacts commonly associated with conventional preamplifiers. The result is a refined listening experience with effortless detail retrieval, expansive sound staging, and natural musical flow.

Pure Passive TVC Architecture

At the heart of the Symphony One is its Transformer Volume Control design, which replaces conventional resistor-based attenuation with precision transformer-stepped control. This approach maintains excellent channel balance and optimal impedance matching across the full volume range while preserving low-level detail and dynamic contrast.

Unlike many passive preamps that can struggle to drive certain amplifiers, the Symphony One uniquely incorporates native +6dB gain by selectively switching transformer primary windings. This enables stronger system compatibility and improved drive capability without introducing active amplification stages into the signal path.

Signal Purity Through Intelligent Isolation

A major focus of the Symphony One is maintaining complete separation between the delicate audio signal and all control circuitry.

Its relay switching network operates on a fully isolated DC control system dedicated solely to volume selection, input switching, and display functions. By physically and electrically separating these systems from the audio path, the Symphony One minimizes interference and preserves signal integrity.

The internal audio layout further reinforces this philosophy through meticulous point-to-point silver-plated wiring, reducing unnecessary connections and eliminating the clutter and signal contamination often found in traditional passive designs.

Premium Components & Engineering

Every component inside the Symphony One has been selected for sonic transparency, reliability, and long-term performance.

Custom Super Permalloy Transformers

The custom-wound transformers utilize exotic Super Permalloy cores chosen for their extremely low distortion characteristics and exceptionally linear frequency response. Their wide bandwidth performance allows the Symphony One to reproduce music with remarkable openness, precision, and extension.

Military-Grade Relay System

Input and volume switching are handled by high-reliability relays rated for millions of operations, ensuring silent, crackle-free performance over years of use.

Ultra-Clean Power Delivery

The included iFi silent power supply delivers ultra-low-noise DC power exclusively for the control and relay circuits. Because the audio signal remains entirely passive and isolated from the PSU, the Symphony One achieves battery-like noise performance without contaminating the audio path.

Connectivity

The Symphony One provides:

• 4 line-level inputs
• 1 stereo output
• Remote-controlled input selection
• Remote-controlled volume adjustment
• Mute functionality

This minimalist layout reflects the unit’s focus on signal purity and ease of integration into high-performance stereo systems.

Build & Physical Presence

Crafted from a substantial precision-machined chassis, the Symphony One weighs 6.5kg, giving it the solid, resonance-controlled feel expected from a reference-grade audio component. Its robust construction contributes not only to durability, but also to mechanical stability and vibration resistance for optimal sonic performance.

Dimensions

• Width: 365mm
• Depth: 213mm
• Height: 113mm

The compact yet substantial footprint allows the Symphony One to integrate elegantly into both modern minimalist systems and traditional high-end audio racks.

Industrial Design & User Experience

Designed to function both as an audiophile component and a tactile centrepiece, the Symphony One features a refined chassis construction paired with a premium heavy-duty aluminium remote control.

The remote itself is precision-machined and fitted with long-life tactile switches for confident operation and durability. Every interaction—from volume adjustment to input switching—has been engineered to feel deliberate, precise, and substantial.

Designed for the Purest Listening Systems

The Allclear Audio Symphony One is intended for discerning listeners seeking maximum transparency without the sonic footprint of active circuitry. By combining transformer-based attenuation, isolated control systems, exotic magnetic materials, and meticulous construction, it delivers a highly resolved and natural presentation that remains faithful to the source.

Videos

"The sound from the Symphony One to my ears is just as good as whatever has gone into it. It makes the overall hi-fi system sound better by not making it sound worse."

"..if you want a preamp that sounds that good in the sense that it doesn't sound like anything at all, then keep your eyes and ears out for the Allclear Symphony One"

-PASSION FOR SOUND

User Reviews

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