Cayin C9ii Portable Headphone Amplifier - Experience the premium sound of vacuum tubes anywhere you go
Experience the thick, lush, and vibrant tones of a vacuum tube amplifier in a portable package with the Cayin C9ii Portable Headphone Amplifier.
Featuring Gen5 Nutube Circuits for variable sound experience, Dual Amp Operation for exquisite tone, battery-driven power circuitry for distortion-free playback, and an ultra-precise volume control for an immersive experience.
The C9ii delivers true desktop-class sound on the go, so you can experience high-fidelity sound no matter where you go.
What's In The Box?
- Cayin C9ii Nutube Portable Headphone Amplifier
- C9ii Battery Module (Mounted on the device)
- CS-35C35II Single-ended Interconnect Cable
- CS-44C44II Balanced Interconnect Cable
- Samsung INR18650-35E Batteries x4
- Hi-Res Stickers
- Type-C Cable
- User Manual
Nutube 6P1 Chip, so you can experience warm, tube-like sound on the go
The Cayin C9ii features the latest generation Gen5 Nutube 6P1 Vacuum Tube Circuit, designed to give you a taste of the distinct rich and vivid tone of a tube amplifier.
The Gen5 Nutube 6P1 is compact, energy-efficient, and more robust than traditional vacuum tubes. Your music will sound life-like, energetic, and enjoyable on just about any headphone or IEM.
Dual Tube Timbre, so you can find the right sound for you
The Cayin C9ii features two independent NFB loops to give you two vacuum tube sound experiences in a compact device you can take anywhere.
Choose between Modern or Classic and transform your music in ways you never thought possible.
Modern: Modern Tube Amplifier sound. Clean and detailed.
Classic: Classic Tube Amplifier characteristics. Organic sound, with rich, thick tones.
Alternatively, you can opt for a more high-fidelity sound experience by switching to the Solid-State Timbre option. Solid-state lets you experience your music with unmatched clarity and detail without harshness.
Adjustable Anode Voltage switch lets you fine-tune sound to your preferences
The C9ii Portable Headphone Amplifier's sound-shaping capabilities doesn't end with the timbre switch. With the Adjustable Anode Voltage switch, you can mix and match voltage options with the various tube amp timbre options to create the perfect sound for your preferences.
- Tube (Classic) Anode (H): Rich tube timbre. Emotional sound with a bias towards vocals and details.
- Tube (Classic) Anode (L): Lighter tube timber with excellent vocals and thick tones.
- Tube (Modern) Anode (H): Light tube timber, smooth midrange, and subtle treble sparkle.
- Tube (Modern) Anode (L): Balance between tube timber and Solid State tone. Great resolution and detail.
- Solid State: Clean, balanced, studio-like sound.
Fully Symmetric Headphone Amplifier, so your music sounds clear and authentic every time
Cayin pulled out all the stops for the C9ii Portable Amplifier, packing it with four discrete differential channels and a multi-stage amplification circuit so you can experience a clean, studio-like sound like never before.
With eight ultra low-noise JFETs, LSDK489 and LSJ689 JFETs, Toshiba BJT (PNP) Transistors, and Nexperia bipolar transistors, the Cayin C9ii is guaranteed to deliver top-of-the-line sound anywhere, anytime.
Dual Amp Operation with Hyper Mode, so you can get the best out of any headphone or IEM
The Cayin C9ii is in a class of its own in the portable amplifier market. Its dual amplifier circuits let you switch between Class A and Class AB operations, allowing you to tune the amplifier to your listening preferences
.
Switch to Class A amp mode and enjoy a warm, lush sound without distortion. Toggle to Class AB mode and enjoy a more energetic listening session, characterized by a clean sound with tight and powerful bass.
If you want the ultimate soundstage experience, switch to Hyper Mode and enjoy unmatched detail and immersion in your music.
Sound Shaping Features, so you can fine tune your music seamlessly
The Cayin C9ii makes finding the perfect sound easy. On top of the Tube Timber, Anode Voltage, and Dual Amp options, the C9ii also features a Negative Feedback Mode which significantly adjusts sound characteristics and response of the amp circuit.
Mix and match various sound shaping features and discover new ways to enjoy your favorite music on the Cayin C9ii.
Ultra-Precise Volume Control, so you can enjoy an immersive sound at any volume
The humble volume knob is often overlooked in many audiophile-grade DAC/Amps and Amplifiers - not the C9ii.
The C9ii Headphone Amplifier's MUSES72320V ladder-based volume control boasts ultra-precise channel balance, noise, and distortion characteristics, so your music sounds immersive - even at lower listening volumes.
Direct Battery Power lets you listen to music all day with unmatched clarity and detail
The Cayin C9ii Headphone Amplifier is powered by four Samsung 35E batteries for consistent performance and long battery life.
Batteries are the preferred power source of many high-end portable audio devices. The Cayin C9ii's quad Samsung 35E batteries ensure you enjoy high-resolution sound all day.
The 18650 batteries in the Cayin C9ii are user-replaceable, allowing you to experiment with various brands of 18650 batteries to get your desired sound characteristics. Slide out the tool-free Modular Battery Tray and switch batteries like you would with your TV remote. It's simple and easy!
Front-Mounted Dual Inputs and Outputs for seamless connections to your favorite headphones or IEMs
The C9ii Headphone Amplifier has all the inputs and outputs you need to enjoy music without compromise.
Connect your DAC/Amp, DAP, or Phone through the 4.4mm Balanced or 3.5mm Single-ended inputs and plug in your preferred headphones or IEMs through the 4.4mm Balanced Output or 3.5mm Single-ended Output.
With the Cayin C9ii's incredible Nutube technology and sound-shaping features, you can enjoy an incredible high-resolution sound experience life never before.
Cayin HA-3A Specs
GENERAL INFORMATION
Input
3.5mm TRS
4.4mm TRRRS
Output
3.5mm TRS
4.4mm TRRRS
Charging
USB Type-C with Quick Charge 3.0/Power Delivery 2.0 9V-2A
Dimensions
165 x 88.5 x 30mm
Net Weight
650g ( /- 5g)
Timber Circuit (Tube)
KORG Nutube 6P1 x2
Timber Circuit (Solid State)
Toshiba 2SK209 x4
Input Differential Amp
LSK489 LSJ689 JFET x4
Electronic Volume Control
MUSES72320V x2
Battery
Samsung INR18650-35E (3400mAh) x4
BATTERY INFORMATION
Solid State
Class A: 15 hours (SE), 13.5 hours (Balanced)
Class AB: 17.5 hours (SE), 10.5 hours (Balanced)
Hyper: 14.7 hours (SE), 10.2 hours (Balanced)
Vacuum Tube (Modern)
Class A: 11.5 hours (SE), 8.2 hours (Balanced)
Class AB: 12.5 hours (SE), 9.5 hours (Balanced)
Hyper: 11.2 hours (SE), 9 hours (Balanced)
Charging Time
Standard Charger (5V-2A): 6.5 hours
Quick Charge 3.0/PD2.0 (9V2A): 3.8 hours
HEADPHONE OUTPUT INFORMATION
Power Output
3.5mm SE: 1200W@16 Ohm, 700mW@32 Ohm, 160mW@150 Ohm, 80mW@300 Ohm (High/Low Gain)
4.4mm Balanced: 4100mW@16 Ohm, 2600mW@32 Ohm, 640mW@150 Ohm, 320mW@300 Ohm (High/Low Gain)
Frequency Response
Tube: 20kHz-80kHz ( /-0.5dB)
Solid State: 11kHz-80kHz ( /-0.5dB)
