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  • Cayin RU9

Cayin RU9

Portable Tube/Solid-state DAC/Amplifier

  • Nutube 6P1 Application
  • Dual AKM AK4493SEQ DAC
  • 16-Core XMOS XU316 Processor
  • Triple Power Supply Modes
  • Magnetic Back Design
  • USB Audio DAC
Regular price £449.00
Sale price £449.00 Regular price
Unit price
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    Cayin RU9

    Cayin RU9

    Regular price £449.00
    Sale price £449.00 Regular price
    Unit price

    Preorder Coming Soon

    Experience the Future of Portable Hi-Fi with Tube and Solid-State Precision

    Get ready to elevate your listening experience—the Cayin RU9, a groundbreaking Tube/Solid-State DAC Amplifier, is opening for preorder soon. This high-performance portable device is powered by the Nutube 6P1 and lets you seamlessly switch between tube and solid-state modes on both single-ended 3.5mm and balanced 4.4mm outputs. It features three distinct sound signatures—Classic, Modern, and Solid-State—catering to every audiophile preference.

    Classic mode offers rich harmonic warmth and vintage THD characteristics, Modern mode balances tube sweetness with reduced distortion, and Solid-State mode delivers ultra-clean, neutral playback using precision op-amps. With dual AKM AK4493SEQ DACs operating in mono and a 16-core XMOS XU316 processor for pristine digital decoding, the RU9 sets a new standard for portable audio fidelity.

    Compact, Powerful, and Thoughtfully Engineered

    Designed for Audiophiles, Built for the Road

    The RU9 isn’t just about sound—it’s built for real-world use with a robust set of features tailored to both audiophiles and mobile users. Its triple power supply system includes a built-in 2000mAh battery, USB power bypass, and external DC input with QC/PD fast charging. Activate Hyper Mode under DC power to unlock its full potential, pushing out up to 1170mW per channel in balanced mode.

    The Nutube is protected by a custom anti-vibration system for clean, microphonic-free playback. Weighing only 150g and enclosed in a CNC-machined unibody chassis, the RU9 also includes a magnetic back for smartphone attachment, a premium leather case, a 0.96” color display, tactile volume knob, and multicolor LED indicators. Fully compatible with UAC1.0/2.0 USB, S/PDIF, and high-definition Bluetooth via Qualcomm QCC5125, the RU9 delivers elite performance wherever you go.

    Nutube 6P1 Application

    Classic：

    No global negative feedback; each stage uses local feedback. Tube amplification introduces higher total harmonic distortion (THD). Rich harmonic texture delivers a warm, nostalgic sonic flavor — classic “tube sound.”

    Modern：

    Introduces global negative feedback to define total gain. THD is significantly reduced. Harmonically cleaner, quieter background while preserving the warmth of tubes. Yields a sweet, clear, and delicate modern tube audio signature.

    Solid-state：

    Based on precision-tuned op-amp ICs and peripheral circuits. Offers neutral tonality, fast transients, and highly accurate audio reproduction. Ideal for listening to music with its original, uncolored character.

    Dual AKM AK4493SEQ DAC

    Equipped with dual AK4493SEQ DACs, each operating in mono mode. Left and right channels are decoded separately for lower crosstalk and better channel separation.

    16-Core XMOS XU316 Processor

    Employs the latest generation XMOS XU316 USB Audio solution for high-performance digital processing.

    Triple Power Supply Modes

    Built-in 2000mAh lithium battery provides up to 4.7 hours of battery-powered use. Also supports USB power from the external device (without charging the battery), as well as external DC power supply for increased output power. Compatible with QC/PD fast charging. 

    Hyper Mode

    A specialized feature designed for headphone usage under DC power supply. Increases static operating current and voltage for enhanced audio performance.

    • Balanced: 1000mW + 1000mW @ 32Ω; 1170mW + 1170mW @ 16Ω
    • Single-ended: 420mW + 420mW @ 32Ω; 610mW + 610mW @ 16Ω

    Magnetic Back Design

    Magnetic rear panel allows seamless attachment to smartphones. Includes a custom Cayin leather case — hand-stitched, supple leather, precise cutouts, and magnetic back for secure attachment.

    Comes with a L-shaped USB cable, ergonomically angled to avoid hand obstruction.

    Custom-designed anti-vibration system for the Nutube vacuum tube. Features a custom-built silicon housing on an FPC flexible PCB and a pin-supported vertical suspension system to eliminate microphonics.

    USB Audio DAC

    Supports UAC1.0 (driverless) and UAC2.0 modes.

    Compatible with smartphones, computers, digital audio players, tablets, and gaming consoles.

    Uses Qualcomm QCC5125 for high-definition Bluetooth transmission.

    Supports LDAC and other HD Bluetooth codecs

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