Open Box FiiO K11 R2R High-Performance Desktop DAC / Headphone AMP
SKU: 88965390186

Open Box FiiO K11 R2R High-Performance Desktop DAC / Headphone AMP

Sale price$107.09 Regular price$118.99
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Description

Open Box FiiO K11 R2R High-Performance Desktop DAC / Headphone AMPOur open box products, used exclusively for unboxing videos, are original and unworn, available at a surprise discount price. Only one of each type in stockfirst come, first served. Purchase now for immediate shipping. Features: >High Performance Desktop R2R DAC AMP. >Fully Differential 24 Bit R2R Resistor Array. >NOS OS Dual Mode Free Switching. >Professionally Designed Electronic Volume Control Chipset(NJW1195A). >Supports 32 Bit 384kHz PCM and

Our open box products, used exclusively for unboxing videos, are original and unworn, available at a surprise discount price. Only one of each type in stock—first come, first served. Purchase now for immediate shipping.

Features:-

>High-Performance Desktop R2R DAC/AMP.

>Fully Differential 24-Bit R2R Resistor Array.

>NOS/OS Dual-Mode Free Switching.

>Professionally Designed Electronic Volume Control Chipset(NJW1195A).

>Supports 32-Bit/384kHz PCM and Native DSD256 Audio Signal Processing.

>Professional Audio Amp Circuit.

>1300mW+1300mW Strong Output.

>Three-Levels Adjustable Gain.

>Specially Designed Low-Noise Power Supply.

>6.35mm+4.4mm Dual Headphone Output Options.

>High-Quality Emerald Solid-State Capacitors.

>Customized LCD Display Screen.

>Global RGB Logo Light.

FiiO has released a new R2R variant for its highly acclaimed K11 desktop DAC/AMP. With a self-developed fully differential 24-Bit R2R Resistor Array, the K11 R2R brings a smooth and rich sound to its listeners. The K11 R2R has NOS/OS dual operating modes, each having its own sound characteristics. The DAC/AMP houses dual headphone output options, one 6.35mm single-ended and another 4.4mm balanced port. Equipped with a powerful amp section with three-level adjustable gain and high-quality emerald solid-state capacitors, the K11 R2R delivers a strong output of 1300mW per channel. Experience a rich, smooth, organic R2R sound with the FiiO K11 R2R, available now!!

Fully-Differential 24-Bit R2R DAC Array:-

FiiO has featured its newly developed four-channel fully differential 24-bit R2R resistor array on the K11 R2R. It consists of 48 resistors per channel, a total of 192 high-precision ultra-thin film resistors with 0.1% accuracy and low-temperature drift between the four channels. It promises clean and crisp output with dark background thanks to the specially developed audio circuit architecture.

NOS/OS Dual Operating Modes:-

FiiO K11 R2R has NOS(Non-Oversampling) and OS(Oversampling) dual operating modes. These are freely switchable and offer dual sound characteristics with the device. The NOS mode maintains the original sampling rate while signal processing while the OS mode oversamples all the signals to 384kHz for processing. NOS mode results in more musical presentation while the OS mode delivers more details and clarity.

Powerful Amp Section:-

FiiO has equipped the K11 R2R with professionally designed amp circuitry. It consists of Ti OPA1642 as Low-Pass filters and then dual SGM8262 Professional-grade operational amplifiers. The K11 R2R has an output power rating of up to 1300mWx2, which is adequate enough to drive demanding headphones with ease. It has three-level gain modes for easy pairing with sensitive as well as high-power requiring gear. The K11 R2R also adopts NJW1195A precise digital volume chipset for precise volume adjustment with low distortion between the channels.

Dual Headphone Output Ports:-

FiiO K11 R2R houses dual headphone output ports. It consists of a single-ended 6.35mm port and a balanced 4.4mm output port. You can easily pair different IEMs and headphones with the K11 R2R and enjoy high-resolution music to all its glory.

True High-Resolution Audio Signal Processing:-

FiiO K11 R2R supports decoding for high-resolution audio signals. It has full support for PCM and DSD signal processing supporting up to 32-bit/384kHz PCM and DSD256 audio signals. DSD256 requires the DSD output mode to be set to native. It is internally converted into PCM for R2R signal processing.

Professionally Designed Low-Noise Power Supply:-

FiiO K11 R2R features a professionally designed low-noise power supply. It consists of 17 Low-Noise LDO precision voltage regulator ICs and 2 DC-DCs providing a multi-channel power supply. It further benefits from the external 12V power supply ensuring a clean output with low noise and distortion issues. K11 R2R delivers quality sound for its users.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 88965390186

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Amazon Customer
Birmingham, US
★★★★★ 3
REALLY unsafe to walk around in these
Size: 2 pairs black L
They do what they are expected to do, but should only be used if you are stationary. The gel base makes for very unstable footing if walking around
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Reviewed in the United States on May 27, 2026
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Suz
Pawtucket, US
★★★★★ 5
These work
Size: 2 pairs black L
My husband loves these they help his very dry feet. As others have stated they are extremely difficult to walk in so have to be careful but they do work nicely.
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MW
New York, US
★★★★★ 1
Potential Fall Risk
Size: 2 pairs black L
While these socks do indeed help soften rough skin on your feet, there is a risk of falling while wearing them. Although they have treads on the bottom, which would indicate they’re safe to wear with nothing else, when you put moisturizer on and then wear them your foot can slip inside the sock . This causes you to lose your balance and fall, which happened to me. I’ve thrown them out.
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Reviewed in the United States on October 24, 2024
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zach
Lexington, US
★★★★★ 4
I could be a foot model now!!!
Size: 1 pair black L
I wear work boots almost all of the time so I bought these to put on my feet with salycylic acid to moisturize and try to get rid of a stubborn corn on the ball of my foot. It helped drastically after a few nights of lounging in the house with them on.
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Reviewed in the United States on May 11, 2026
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CMA
Lake Worth, US
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Favorite treat
Flavor Name: Duck & Veggies, Size: 5 Ounce (Pack of 1)
My dog loves these treats the best, and the spoiled pooch has tried many! I love that these are super small sized, not messy, and low calorie which allows for lots of reinforcement while training. I also appreciate that the ingredients are very clean.
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Reviewed in the United States on December 8, 2025

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