Cayin RU9 Portable 6P1 Electronic Tube Headphone Amplifier Bluetooth5.1 Magnetic Rear Panel Audio Decoder AK4493SEQ DAC

Cayin RU9 Portable 6P1 Electronic Tube Headphone Amplifier Bluetooth5.1 Magnetic Rear Panel Audio Decoder AK4493SEQ DAC

Key Features:
For Nutube 6P1 Application:
- Supports both single-ended 3.5mm and balanced 4.4mm PO/LO outputs.
- Each output can toggle between tube and solid-state modes.

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 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 for 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 at 32Ω; 1170mW + 1170mW at 16Ω
- Single-ended: 420mW + 420mW at 32Ω; 610mW + 610mW at 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.

Vibration Isolation:
- 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.

Elegant and Compact:
- CNC-machined unibody metal chassis.
- Weighs only 150g, and measures 15mm thick.

Thoughtful Details:
- 0.96" color display with adjustable brightness.
- Knurled volume knob with refined tactile resistance.
- Side-mounted multi-color indicator light for charging and sample rate/format display.

Versatile Use Scenarios:
- USB Audio DAC:
  Supports UAC1.0 (driverless) and UAC2.0 modes.
  Compatible with smartphones, computers, digital audio players, tablets, and gaming consoles.

- S/PDIF Input/Output:
  Uses for Qualcomm QCC5125 for high-definition Bluetooth transmission.
  Supports LDAC and other HD Bluetooth codecs.

Specification:
- Product size: 100 x 70 x 15mm
- Net weight: 150g

Package Included:
- 1 x Host