FiiO CLASS A Desktop Headphone Amplifier and Preamplifier

Fully Discrete Pure Class A Amplification Topology

Operating in continuous pure Class A, the output transistors conduct through the complete 360-degree signal cycle, fundamentally eliminating the crossover and switching distortion inherent in Class AB designs. Built entirely from hand-selected, matched discrete transistors and audio-grade resistors, the CLASS A delivers an organic, richly textured acoustic presentation with liquid midrange vocals and extended, fatigue-free highs.

Dual Transistor Harmony: Toshiba and Sanken Array

To achieve the optimal balance of acoustic warmth and authoritative speed, FiiO incorporates two complementary transistor types. Sixteen matched Toshiba twin audio transistors provide a lush, engaging vocal presence and relaxed, blooming bass, while eight high-current Sanken transistors deliver blistering speed, transient precision, and iron-fisted bass grip capable of driving the most demanding planar magnetic and high-impedance dynamic headphones.

4,000mW Balanced Power and 5 Hardware Gain Levels

The fully balanced differential circuit delivers an immense 4,000mW + 4,000mW into 32 ohms through its balanced outputs. Five hardware gain settings (Ultra High, Super High, High, Medium, Low) allow seamless pairing with everything from ultra-sensitive in-ear monitors to power-hungry planar flagship headphones. An active DC servo circuit continuously monitors and nullifies output DC offset to safeguard delicate voice coils.

Linear Power Supply with 60W Toroidal Transformer

Clean, stable current is supplied by a custom-engineered 60-watt toroidal transformer featuring a continuous silicon-steel strip core, pure copper windings, and high-permeability magnetic shielding. Paired with high-speed rectifiers, discrete voltage regulators, and 20,000uF of audiophile-grade Nichicon filtering capacitors, the power supply maintains ultra-low ripple and rock-solid voltage rail stability during high-volume musical crescendos.

Dedicated Analogue Tone Controls and Preamplifier Versatility

Fine-tune your acoustic curve directly from the front panel using independent analogue Bass and Treble controls (+/-10dB adjustment range). With both balanced XLR and single-ended RCA line-level outputs on the rear panel, the CLASS A functions as a reference-grade analog preamplifier for active studio monitors or external power amplifiers, complete with bidirectional 12V Trigger IN/OUT ports for synchronized system power automation.

Comprehensive Input and Output Matrix

The CLASS A accommodates virtually any desktop source with four analogue inputs (RCA single-ended, 3.5mm, 4.4mm balanced, and balanced XLR). Headphone connectivity is equally exhaustive, featuring standard 6.35mm (1/4-inch), 4.4mm Pentaconn balanced, and professional 4-pin XLR balanced output terminals.

In The Box Contents

• FiiO CLASS A Desktop Headphone Amplifier and Preamplifier
• AC Power Cable
• RCA Interconnect Audio Cable
• 4-Pin XLR Protective Dust Cover
• Spare Fuse
• Quick Start Guide
• Warranty Card