Cayin C9II

The Cayin C9ii represents the next evolution in portable high-end amplification, engineered for audiophiles who demand uncompromising sonic performance wherever they listen. Designed with a fully discrete, fully symmetric differential amplification architecture, the C9ii delivers exceptional transparency, immense driving power, and breathtaking musical detail.

At the heart of the C9ii lies a sophisticated three-stage amplification circuit paired with dual KORG Nutube 6P1 vacuum tubes, giving listeners the freedom to switch between warm analog tube sound and precise solid-state clarity. With three amplification modes, three timbre options, and advanced battery-powered performance, the C9ii redefines what a portable headphone amplifier can achieve.

Premium Fully Discrete Amplification Architecture

The Cayin C9ii is built around a fully discrete, fully symmetric differential amplification circuit, carefully designed to deliver uncompromising audio performance.

This sophisticated three-stage architecture enhances signal purity, improves dynamic range, and significantly increases load-driving capability. The result is a powerful yet transparent amplifier capable of revealing the finest details in your music while maintaining exceptional control over demanding headphones.

Audiophiles will appreciate the C9ii’s ability to reproduce music with remarkable realism, depth, and dimensionality.

Three Amplification Modes

The C9ii allows listeners to tailor amplifier behavior through three distinct amplification modes, each designed for different sonic characteristics.

Class A Mode
Produces rich harmonic textures with a natural, organic presentation that closely resembles live music.

Class AB Mode
Balances efficiency and detail, delivering tight dynamics, excellent clarity, and refined control.

Hyper Mode
Unlocks the full potential of the circuit, maximizing dynamic range, soundstage width, and overall performance.

These modes allow users to adapt the amplifier’s character to match their headphones, music genres, and listening preferences.

Triple Timbre Sound Customization

One of the defining features of the C9ii is its three selectable timbre options, providing remarkable tonal flexibility.

Tube Timbre
Utilizes dual KORG Nutube 6P1 vacuum tubes to deliver warm, lush analog sound with rich harmonics and musical depth.

Solid-State Timbre
Offers a clean, highly detailed presentation with excellent resolution and accuracy.

Bypass Timbre
Provides a neutral, uncolored output that preserves the natural sound signature of your source device.

This versatile design allows the C9ii to adapt effortlessly to different music styles, headphones, and personal listening tastes.

Advanced Nutube Timbre Circuit

The C9ii features a sophisticated Gen5 Nutube timbre circuit built with a discrete JFET buffering architecture and constant current source design.

A matched pair of Nutube tubes functions as low-gain voltage amplifiers within a carefully engineered three-stage buffering system. To ensure exceptional stability and precision, the circuit incorporates 16 Toshiba 2SK209 audio-grade JFETs, maintaining consistent current flow regardless of load conditions.

This advanced architecture ensures rich tonal character, improved dynamics, and outstanding sonic realism.

Flexible Connectivity for Any Setup

The C9ii integrates seamlessly into both portable and desktop audio systems thanks to its versatile connectivity options.

Input and Output Options

• 4.4mm balanced input
• 3.5mm single-ended input
• 4.4mm balanced output
• 3.5mm single-ended output

These connections allow the amplifier to work effortlessly with digital audio players, DACs, smartphones, and laptops while supporting a wide range of headphones and IEMs.

High-Capacity Battery Power System

Powering the C9ii are four high-capacity 21700 rechargeable batteries, ensuring stable high-current delivery and extended playback sessions.

Cayin’s advanced power management circuit guarantees consistent performance across all amplification modes and timbre settings. This robust battery system allows the C9ii to maintain exceptional audio quality without the limitations of traditional portable power designs.

Designed for True Audiophile Listening

The Cayin C9ii is meticulously tuned to deliver a truly reference-grade portable audio experience. With its combination of powerful amplification, customizable timbre options, and advanced circuitry, the C9ii provides an extraordinary level of musical immersion.

From the warmth of vacuum tube sound to the precision of solid-state clarity, the C9ii allows listeners to explore music exactly the way they want to hear it.