Cayin C9ii | Portable Headphone Amplifier

The Cayin C9ii Sets a New Benchmark in Sonic Excellence with Three Versatile Timbre Options, Class A/AB/Hyper Amplification Modes and Advanced Power Management

• Advanced Amplification Circuit: Fully discrete, fully symmetric differential amplification with a three-stage circuit design for superior load-driving capability and enhanced transparency.
• Three Amplification Modes: Offers Class A and Class AB modes, along with the newly introduced Hyper Mode, maximizing circuit performance for superior fidelity, dynamics, and soundstage.
• Triple Timbre Options: Features Tube Timbre with dual KORG Nutube 6P1 vacuum tubes for warm, analog-rich sound, Solid-State Timbre for a clean and precise sound profile, and Bypass Timbre for uncolored output, ensuring versatility for different listening preferences.
• High-Quality Power Management: Powered by four high-capacity 21700 batteries with an advanced power supply circuit to ensure stable, high-current delivery for all modes and timbre options.

Premium Amplification Technology

The Cayin C9ii features a fully discrete, fully symmetric differential amplification architecture with a sophisticated three-stage design. This approach ensures unmatched transparency, a wide dynamic range, and precision in audio reproduction. Its enhanced load-driving capability caters to even the most demanding headphones and IEMs, allowing the C9ii to deliver a balanced, high-fidelity listening experience with ease.

Three Amplification Modes

Designed to cater to diverse listening preferences, the C9ii offers three distinct amplification modes:

• Class A Mode provides rich harmonic textures and a natural, organic sound signature, ideal for immersive music sessions.
  
  
• Class AB Mode balances efficiency and sonic detail, delivering a cleaner sound with tighter control over dynamics.
  
  
• Hyper Mode takes performance to the next level by optimizing the circuit for enhanced soundstage depth, superior dynamics, and crystal-clear fidelity.

Heavy-Duty Timbre Circuit

The Cayin C9ii features an advanced Gen5 Nutube 6P1 vacuum tube circuit with a fully discrete JFET buffering architecture, paired with a high-performance constant current source design.

This state-of-the-art three-stage low-gain buffering timbre circuit employs a matched pair of Nutubes as low-gain voltage amplifiers, enabling enhanced load-driving capability.

To achieve superior audio performance, the circuit integrates 16 Toshiba 2SK209 audio-grade JFETs, ensuring stable and consistent current regardless of varying voltage loads. This innovative design delivers a rich, authentic timbre, allowing for precise and dynamic sound reproduction across all listening scenarios.

Versatile Timbre Selection

The C9ii takes customization further with three selectable timbre options:

• Tube Timbre utilizes dual KORG Nutube 6P1 vacuum tubes to produce a warm, lush analog sound that exudes musicality.
  
  
• Solid-State Timbre offers a clean and precise sound signature with remarkable clarity and resolution.
  
  
• Bypass Timbre provides a neutral and uncolored signal, preserving the original sound of your audio source.

These timbre options allow users to tailor the audio output to suit their preferences or specific genres of music, delivering unparalleled versatility.

Flexible Connectivity Options

The C9ii ensures compatibility with a variety of audio setups thanks to its balanced (4.4mm) and single-ended (3.5mm) inputs and outputs. This versatility allows the amplifier to seamlessly integrate into both portable and desktop systems, accommodating a wide range of headphones and source devices.

High-Quality Power Supply

At the heart of the C9ii’s reliable performance is its robust power supply, powered by four high-capacity 21700 rechargeable batteries. These batteries provide extended playtime, ensuring uninterrupted audio enjoyment. The advanced power management circuit delivers a stable, high-current supply, guaranteeing consistent performance across all amplification modes and timbre settings.

Unparalleled Sound Performance

The Cayin C9ii is meticulously tuned to deliver the ultimate audio experience, transcending the boundaries of portable amplification. Whether you prefer rich analog warmth, precise solid-state detail, or a neutral and uncolored sound, the C9ii adapts to suit your needs.

Specifications

• Analog Inputs
  • 3.5mm TRS
  • 4.4mm TRRRS
• Analog Outputs
  • 3.5mm TRS
  • 4.4mm TRRRS
• Timbre Circuit (Tube): KORG Nutube 6P1 x2
• Timbre Circuit (SS): Toshiba 2SK209 JFET x 4
• Input differential Amp: LIS LSK489 + LSJ689 JFET x 4 
• Electronic Volume Control: MUSES72320x2
• Battery: Samsung INR18650-35E (3400mAh) x4
• Dimensions: 165 x 88.5 x 30mm
• Weight: 650g
  
• C9ii Product and Battery Specs
• C9ii Headphone Output Specs

In the Box

• C9ii Portable Headphone Amplifier
• C9ii Battery Module
  
• Single-ended Portable Interconnect (3.5mm to 3.5mm)
• Balanced Portable Interconnect (4.4mm to 4.4mm)
• Samsung Samsung INR18650-35E Batteries x4
• USB-C Charging cable
  
• User Manual