Eleven XI Audio A390 Integrated Amplifier — Precision Power with VCIA™ Technology

Integrated Amplifier

More than an integrated amplifier; it represents our ongoing exploration of amplification technology and the reproduction of music itself.

VCIA™ Architecture

VCIA™ is not about adding complexity, but about bringing the amplifier closer to an ideal state of operation.

Through its Voltage & Current Isolated amplification architecture, each amplification stage is allowed to operate under optimal conditions, achieving a purer, more precise, and more refined musical performance.

By separating voltage and current amplification stages, it enables each stage to operate under optimal conditions, resulting in a purer, more precise, and more stable musical performance.

Whether paired with bookshelf speakers, desktop systems, or more demanding high-end audio setups, it delivers a refined, natural, and emotionally engaging musical presentation.

Power Output and Design Philosophy

Rated at 39W × 2 into 8Ω. This is not a specification driven by power competition, but a deliberate design choice based on real-world listening environments.

In typical home audio systems, the average listening power is far below an amplifier's maximum output. What truly defines sound quality is performance at low power levels — where linearity, control, and fine detail matter most.

For this reason, the design is centered around the region where music actually lives: the "first watt."

Through VCIA™ architecture and precision circuit design, it maintains excellent channel balance, ultra-low distortion, and full musical detail even at low listening levels. The 39W output provides sufficient dynamic headroom, while avoiding unnecessary compromises in sound purity made for the sake of higher numbers.

Signal Isolation and Interference Reduction

In traditional architectures, simultaneous changes in voltage and current can easily lead to mutual interference. VCIA™ separates the two operating regions, allowing each amplification stage to perform its own task, significantly reducing interference and nonlinear errors.

The voltage amplification stage can be optimized for gain accuracy. The current amplification stage can focus on output control and load driving. This division of labor allows for a more detailed and transparent sound.

Intermodulation Distortion Reduction

Music signals contain a large number of different frequency components. When different signals interfere with each other during amplification, intermodulation distortion can easily occur. The VCIA™ architecture reduces signal coupling, preserving musical details and allowing complex arrangements to still present clear layers.

Thermal Management

Current amplification is typically accompanied by high heat generation. Through its independent architecture, VCIA™ effectively manages thermal effects, enabling the amplifier to maintain stable performance during extended operation.

Component Quality and Circuit Design

The amplification core utilizes over 300 carefully selected components per channel. The entire unit comprises over 1000 parts, rigorously configured and calibrated. Through modern control theory analysis, the circuit zeros and poles are precisely set, enabling it to maintain high stability even under complex speaker loads. This is not merely a design choice for power output, but a pursuit of sonic precision.

Class AB Amplification

Combining the proven reliability of traditional Class AB with VCIA™ technology, it delivers a pure, accurate, and musical sound.

Distortion and Linearity

The low distortion and high linearity design allows it to fully reproduce the subtle changes in music. From delicate airy sensations to powerful dynamics, everything remains natural and fluid.

Preamplifier and Volume Control

The preamplifier employs high-precision R-2R electronic volume control. Compared to traditional carbon film potentiometers:

• Lower distortion
• Better left and right channel consistency
• Higher reliability

Maintains precise balance even at low volumes.

Input Channel Memory

Each Input Channel can independently remember:

• Volume Settings
• Gain Settings

More intuitive and smoother switching between multiple devices.

Compact Design and Versatility

Features a compact design, delivering high-performance driving capabilities within a limited size. It can be flexibly matched with desktop systems, small speakers, and even large loudspeakers. It also comes with intuitive infrared remote control operation.