When Cayin released the first generation of the C9 portable headphone amplifier in 2021, it quickly gained recognition among audiophiles. Three and a half years later, we have developed the C9ii to meet the highest demands, allowing you to hear your music as it was originally intended – with all its depth and emotion.

Audio circuit with the groundbreaking 5th generation Nutube 6P1

Imagine experiencing music in a new dimension – the C9ii makes this possible, equipped with the revolutionary fifth-generation Nutube 6P1 vacuum tube. Cayin has integrated this innovative technology into a variety of its products, from the N8 to the C9, the N30LE, and now the C9ii. But what makes this vacuum tube so special? In a compact and energy-efficient format, it unfolds the warmth and musicality of classic tube amplifiers, lending a fascinating sonic texture to every note. Experience how the natural character of the music comes to life, preserving the emotional depth of every recording.

Switchable anode voltage – your personal sound style

Have you ever considered how much influence anode voltage has on the sound? After years of intensive research and technical refinement, Cayin has enhanced the C9ii with a selectable anode (plate) voltage function. This feature offers you the choice between two levels: high and low. Do you want a softer, warmer sound reproduction? Then choose the low setting! Or do you prefer a more dynamic, detailed performance? Then the high voltage is exactly right for you! This flexibility delights not only audiophiles but also every music lover who wants to drive their high-end headphones optimally to tease out the subtleties of every recording.

Fully balanced headphone amplifier – sound in perfection

And that's not all. The Cayin C9ii features a fully balanced amplifier design. This modern circuit architecture ensures unparalleled fidelity and efficient power. Distortion is minimized, the dynamic range is expanded, and channel separation is increased. The balanced circuit reduces crosstalk between channels, which manifests sonically in a clear soundstage and precise stereo imaging. The C9ii offers you detailed and nuanced music reproduction that will captivate even the most demanding audiophiles. Furthermore, an integrated precision control circuit allows the headphone amplifier to operate in various modes – from NFB/LFB to Class A/Class AB, to Hyper, Single-Ended, and balanced. Which sound variations would you like to experience today?

Feedback and fine-tuning circuits – your personal sound journey

Have you ever wondered how different sound characteristics are created? For the C9ii, Cayin's engineers have developed two special circuits for sound tuning:

Modern Sound: High negative feedback significantly reduces total harmonic distortion (THD) and creates a clear, clean tube sound with minimal thermal noise.

Classic Sound: Here, negative feedback is omitted; each stage operates independently through local feedback. The result: a sound quality that is not just heard, but felt! The harmonic distortions of the tube amplification lend the music a soft, musical soul that makes the listening experience an unforgettable pleasure.

Innovative power supply design: efficiency on a new level!

How important is optimal performance to you? The power supply design of the C9 series is the key to an unparalleled listening experience. Our discrete headphone power amplifier circuits, the C9 and C9ii, are powered by high-capacity 3,400mAh batteries. Why is this crucial? Because it allows us to bypass DC/DC voltage gain conversion, thus creating the ideal power supply environment for analog circuits. Through careful filtering and decoupling using high-quality components like WIMA metal film capacitors and Panasonic POSCAP polymer tantalum capacitors, we guarantee not only the highest sound quality but also extended battery life. Ideal for all music lovers who don't want to compromise on top-class sound even when on the go!

High-quality housing construction: style meets functionality!

What makes a headphone amplifier truly exceptional? The Cayin C9ii impresses not only with its robust and elegant housing construction but also with its superior heat dissipation. The transistors in our four-channel discrete high-performance amplification are the main source of heat – but don't worry! Thanks to innovative graphene thermal pads and aluminum alloy heatsinks, this heat is dissipated efficiently, ensuring even temperature distribution. So you can be sure: even during intensive use, performance remains constant and reliable.

With the Cayin C9ii, we are setting new standards in sound quality, design, and functionality. Experience state-of-the-art technology paired with audiophile details in a compact, portable format. Are you ready for the ultimate listening pleasure? Immerse yourself in a world full of energy and vibrancy – your ears will thank you!

Analog inputs:
1x 3.5 mm jack
1x 4.4 mm jack

Headphone output:
3.5 mm jack
4.4 mm Pentaconn

Power output:
1,200 mW @ 16 ohms, 700 mW @ 32 ohms, 160 mW @ 150 ohms, 80 mW @ 300 ohms

Power output (balanced):
4,100 mW @ 16 ohms, 2,600 mW @ 32 ohms, 640 mW @ 150 ohms, 320 mW @ 300 ohms

Principle:
Tube, Class-A/AB

Tubes:
2x Nutube 6P1

USB:
1x USB-C (for charging)

Length × width × height:
16.50 × 8.85 × 3.00 cm

Item weight:
0.70 kg

Herstellerangaben:

Zhuhai Spark Electronic Equipment Co., Ltd.
No. 9 LianFa Road
Zhuhai City
Shuanglin , Guangdong Province
China
info@cayin.cn

Verantwortliche Person:

Cayin Audio Distribution GmbH
An der Kreuzheck 8
61479 , Glassworks
Germany
info@cayin.com