FiiO K11 R2R Desktop DAC & Headphone Amplifier with Sennheiser HD600 Audiophile Headphones and Audio-Technica Headphone Cable Bundle BLACK

Build a dedicated desktop headphone listening system with the FiiO K11 R2R DAC and headphone amplifier, Sennheiser HD600 open-back audiophile headphones, and Audio-Technica HDC1233/1.2 headphone cable. The FiiO provides digital-to-analog conversion and dedicated headphone amplification, while the HD600 headphones deliver the natural, spacious stereo presentation associated with their open circumaural design. The Audio-Technica cable is included as an additional accessory for its specifically listed compatible headphone models.

Bundle Includes

• 1 x FiiO K11 R2R Desktop DAC and Headphone Amplifier 1300mW Output Power BLACK - NEW (Model: K11 R2R-B)
• 1 x Sennheiser HD600 Audiophile Grade Hi-Fi Professional Stereo Headphones BLACK - NEW (Model: 508824)
• 1 x Audio-Technica HDC1233/1.2 3.5 mm Audiophile Headphone Cable` - NEW (Model: HDC1233/1.2)

The FiiO K11 R2R features a fully differential 24-bit resistor-ladder DAC architecture using 192 precision resistors. Its selectable Non-Oversampling (NOS) and Oversampling (OS) modes offer different approaches to digital audio playback, while three gain settings and three independent volume curves provide flexible headphone listening adjustments. With USB, optical, and coaxial digital inputs, the K11 R2R can serve as the centre of a desktop audio system.

The Sennheiser HD600 headphones feature an open circumaural design, computer-optimized magnet systems, lightweight aluminum voice coils, and advanced diaphragm engineering. Their detachable cable and supplied 6.3mm headphone adapter support connection to the FiiO K11 R2R's 6.35mm single-ended headphone output. The K11 R2R also provides a 4.4mm balanced headphone output, although the supplied HD600 accessories do not establish a balanced connection.

The Audio-Technica HDC1233/1.2 is a separate 1.2m audiophile headphone cable with silver-plated annealed copper conductors, cloth wrapping, and gold-plated 3.5mm stereo connectors. Its stated compatibility covers selected Audio-Technica headphones, not the Sennheiser HD600. It should therefore be considered an additional accessory rather than a replacement cable for the HD600.

Features

• Desktop headphone listening bundle with DAC, headphone amplifier, audiophile headphones, and an additional headphone cable
• FiiO K11 R2R fully differential 24-bit resistor-ladder DAC architecture
• 192 precision thin-film resistors with 0.1% tolerance
• Selectable NOS and OS digital conversion modes
• USB DAC decoding support up to 384kHz/32-bit and DSD256
• Three headphone amplifier gain levels: Low, Medium, and High
• Three independent volume curves
• Up to 1300mW + 1300mW balanced headphone output at 32 ohms
• 6.35mm single-ended and 4.4mm balanced headphone outputs
• USB Type-C, optical, and coaxial digital inputs
• RCA analog line output and coaxial digital output
• High-quality NJW1195A electronic volume control
• Custom LCD display showing playback and operating information
• Adjustable RGB logo illumination
• Dedicated headphone protection and power-saving functions
• Sennheiser HD600 open-back circumaural headphone design
• Advanced diaphragm construction designed to reduce standing waves
• Computer-optimized magnet systems for reduced distortion
• Lightweight aluminum voice coils for transient response
• Neodymium ferrous magnet systems
• Detachable oxygen-free copper headphone cable
• Sennheiser HD600 two-year warranty
• Audio-Technica HDC1233/1.2 cable with silver-plated annealed copper conductors
• Cloth-wrapped 1.2m cable with gold-plated 3.5mm stereo connectors

FiiO K11 R2R Desktop DAC and Headphone Amplifier Specifications

General

• Product: FiiO K11 R2R Desktop DAC and Headphone Amplifier 1300mW Output Power BLACK
• Model: K11 R2R-B
• Condition: New
• Colour: Black
• Product Type: Desktop Digital-to-Analog Converter and Headphone Amplifier
• DAC Architecture: Fully Differential 24-Bit R2R
• DAC Resistor Configuration: Four channels with 192 precision thin-film resistors
• Resistor Tolerance: 0.1%
• System Controller: GD32F303RE
• USB Decoding Chip: SA9312L
• Amplifier Components: SGM8262-2 x 2
• Electronic Volume Control: NJW1195A
• Volume and Menu Control: Multifunction Encoder Knob
• Gain Settings: Low, Medium, High
• Volume Curves: Three Independent Curves
• Oversampling Modes: OS and NOS
• Display: Custom LCD
• Lighting: Adjustable RGB Logo Illumination
• Firmware Updates: Supported Through USB
• Driver-Free Mode: Supported
• Power Supply: DC 12V / 2A
• Battery: None
• Dimensions Including Feet: 147 x 133 x 32.3mm / approximately 5.79 x 5.24 x 1.27 inches
• Unit Weight: Approximately 420g / 0.42kg / 0.93lb

Digital Audio Decoding

• USB DAC Maximum Sampling Rate: 384kHz/32-bit and DSD256
• Coaxial Input Maximum Sampling Rate: 192kHz/24-bit
• Optical Input Maximum Sampling Rate: 96kHz/24-bit
• DSD256 Processing: Requires Native DSD output setting on the source device; internally converted to PCM for R2R decoding
• NOS Mode: Maintains the original sampling rate
• OS Mode: Oversamples to 384kHz
• Sampling Rate Display: LCD screen and illuminated logo

Connections

• USB Input: USB Type-C
• Optical Digital Input: 1
• Coaxial Digital Input: 1 RCA
• Coaxial Digital Output: 1 RCA, functional in USB mode
• Analog Line Output: RCA
• Single-Ended Headphone Output: 6.35mm / 1/4-inch
• Balanced Headphone Output: 4.4mm
• Single-Ended Headphone Impedance Range: 8-150 ohms
• Balanced Headphone Impedance Range: 8-350 ohms
• Output Modes: Headphone Output, Preamplifier, and Line Output

RCA Line Output Performance - OS Mode

• THD+N: Approximately 0.025% at 1kHz/0dB into 10 kilohms
• Signal-to-Noise Ratio: At least 115dB A-weighted
• Channel Crosstalk: At least 111dB
• Noise Floor: Less than 5.1 microvolts A-weighted
• Frequency Response: 20Hz-20kHz, attenuation less than 0.2dB; 20Hz-50kHz, attenuation less than 1.2dB
• Dynamic Range: At least 107dB
• Line Output Level: 2.7Vrms

6.35mm Single-Ended Headphone Output - OS Mode

• Output Power at 16 Ohms: At least 660mW + 660mW, THD+N less than 1%
• Output Power at 32 Ohms: At least 460mW + 460mW, THD+N less than 1%
• Output Power at 300 Ohms: At least 50mW + 50mW, THD+N less than 1%
• THD+N: Approximately 0.025% at 1kHz/0dB into 32 ohms
• Signal-to-Noise Ratio: At least 115dB A-weighted
• Noise Floor: Less than 7.2 microvolts A-weighted
• Channel Crosstalk: At least 72dB
• Dynamic Range: At least 107dB
• Frequency Response: 20Hz-20kHz, attenuation less than 0.2dB
• Output Impedance: Less than 1 ohm
• Peak Output Voltage: 11Vp-p

4.4mm Balanced Headphone Output - OS Mode

• Output Power at 16 Ohms: At least 520mW + 520mW, THD+N less than 1%
• Output Power at 32 Ohms: At least 1300mW + 1300mW, THD+N less than 1%
• Output Power at 300 Ohms: At least 220mW + 220mW, THD+N less than 1%
• THD+N: Approximately 0.025% at 1kHz/-11.6dB into 32 ohms
• Signal-to-Noise Ratio: At least 115dB A-weighted
• Noise Floor: Less than 14.1 microvolts A-weighted
• Channel Crosstalk: At least 107dB
• Dynamic Range: At least 107dB
• Frequency Response: 20Hz-20kHz, attenuation less than 0.2dB
• Output Impedance: Less than 1.5 ohms
• Peak Output Voltage: 23Vp-p

Sennheiser HD600 Audiophile Headphones Specifications

• Product: Sennheiser HD600 Audiophile Grade Hi-Fi Professional Stereo Headphones BLACK
• Model: 508824
• Condition: New
• Colour: Black
• Product Type: Audiophile-Grade Hi-Fi and Professional Stereo Headphones
• Design: Open Circumaural
• Driver Technology: Open Dynamic
• Acoustic Construction: Open Metal Mesh Grilles
• Diaphragm: Advanced Design Intended to Eliminate Standing Waves
• Magnet System: Computer-Optimized Neodymium Ferrous Magnets
• Voice Coils: Lightweight Aluminum
• Sound Characteristics: Natural, Spatial, and Accurate Stereo Reproduction
• Headphone Cable: Detachable Oxygen-Free Copper Cable
• Included Adapter: 6.3mm / 1/4-inch Headphone Adapter Plug
• Manufacturer Warranty: 2 Years
• Dimensions and Unit Weight: Not specified in the supplied product description

Audio-Technica HDC1233/1.2 Audiophile Headphone Cable Specifications

• Product: Audio-Technica HDC1233/1.2 3.5 mm Audiophile Headphone Cable`
• Model: HDC1233/1.2
• Condition: New
• Product Type: Detachable Audiophile Headphone Cable
• Cable Length: 1.2m / approximately 3.9ft
• Cable Design: Straight, Cloth-Wrapped
• Conductor Material: Silver-Plated Annealed Copper Wire (AgA+ OFC)
• Input Connector: Gold-Plated 3.5mm / 1/8-inch Stereo Mini-Plug, L-Shaped
• Output Connector: Gold-Plated 3.5mm / 1/8-inch Stereo Mini-Plug
• Specified Compatible Headphones: Audio-Technica ATH-SR5, ATH-MSR7NC, ATH-MSR7, ATH-WS1100iS, and ATH-AR5iS
• Sennheiser HD600 Compatibility: Not specified; this cable is not represented as an HD600 replacement cable

Important Compatibility Information

The Sennheiser HD600 headphones can be connected to the FiiO K11 R2R's 6.35mm single-ended headphone output using the HD600's supplied headphone cable and 6.3mm adapter. The FiiO's published output specifications include headphone amplification performance at 300 ohms, although the supplied Sennheiser product description does not specify the HD600's nominal impedance.

The Audio-Technica HDC1233/1.2 cable is specifically described for selected Audio-Technica headphone models. Its compatibility with the Sennheiser HD600 is not established by the supplied product information. The cable is included in this bundle as a separate accessory and is not required for the FiiO K11 R2R and Sennheiser HD600 listening setup.

What's in the Box

• 1 x FiiO K11 R2R Desktop DAC and Headphone Amplifier BLACK
• 1 x FiiO Power Adapter
• 1 x FiiO AC Power Cable
• 1 x FiiO USB-A to USB-C Data Cable
• 1 x FiiO 3.5mm TRS to 1/4-inch TRS Plug Adapter
• 1 x FiiO User Manual and Warranty Documentation
• 1 x Sennheiser HD600 Audiophile Grade Hi-Fi Professional Stereo Headphones BLACK
• 1 x Sennheiser HD600 Detachable Oxygen-Free Copper Headphone Cable
• 1 x Sennheiser 6.3mm / 1/4-inch Headphone Adapter Plug
• 1 x Audio-Technica HDC1233/1.2 3.5mm Audiophile Headphone Cable