FiiO K11 R2R
Desktop DAC and Headphone Amplifier
- Fully Differential 24-bit R2R DAC
- Dual Audio Modes
- True 24-bit Decoding
- Advanced Audio Circuitry
- Robust Power System
- Intuitive Control & Display
- Comprehensive Safety Features
Fully Differential 24-bit R2R DAC
Engineered with precision, the K11 RAR features a self-developed, four-channel fully differential 24-bit R2R DAC using dual 48-precision thin-film resistor arrays per channel—totaling 192 resistors with 0.1% tolerance and minimal temperature drift. This design guarantees a uniquely charming sound signature that elevates your audio experience.
Superior Noise Performance
Utilizing a fully differential architecture, the K11 RAR dramatically reduces noise and minimizes unwanted FFT harmonics compared to typical designs. This results in a darker, purer musical background that lets every nuance of your audio come through with exceptional clarity.
Versatile Sound Modes
The K11 RAR offers dual NOS (Non-Oversampling) and OS (Oversampling) modes to suit your listening preferences. NOS mode preserves the original sampling rate for an authentic, organic sound, while OS mode upsamples to a high 384kHz rate for refined, crystal-clear audio performance.
True 24-bit Decoding
With support for PCM 384kHz/24bit and DSD256 decoding (with DSD256 converted via Native mode), this DAC effortlessly handles high-precision audio signals. Every subtle detail in your music is faithfully reproduced, delivering an outstanding and immersive listening experience.
Precision Volume Control
Equipped with the NJW1195A four-channel electronic volume controller and featuring three independent gain levels with dedicated volume curves, the K11 RAR adapts seamlessly to everything from delicate in-ear monitors to power-hungry over-ear headphones—ensuring precise, low-distortion adjustments for every setup.
Advanced Audio Circuitry
A specially-designed audio circuit channels the signal from a USB interface through an FPGA and the R2R DAC, followed by low-pass filtering and analog conversion via high-performance op-amps. This meticulous design—complemented by headphone protection and pop noise elimination—ensures that your audio is processed with the utmost integrity and reliability.
Robust Power Supply & Premium Components
The K11 RAR’s power system employs up to 17 low-noise LDO regulators, two DC-DC converters, and a custom 12V switching supply, providing dedicated power rails for multi-channel operation. Coupled with high-quality Beryl solid capacitors offering ultra-low ESR and excellent interference resistance, this design secures a stable, clean power supply for uncompromised audio performance.
Powerful Output Performance
Capable of delivering over 1300mW per channel under a 32惟 load in balanced mode, the K11 RAR drives HiFi earphones and headphones with ease. This robust output ensures that every intricate detail of your music is heard, pushing your audio system to its full potential.
Intuitive Display & Control
A custom high-contrast LCD screen provides at-a-glance information on sampling rate, volume, and gain, while a multi-function volume knob offers total control—powering the device on/off, navigating menus, adjusting volume, and switching between preset modes effortlessly. This design makes managing your audio settings simple and intuitive.
Elegant RGB Logo Lighting
Enhancing both form and function, the adjustable RGB-lit logo not only adds a stylish visual element but also indicates the current sampling rate. With customizable brightness, color, and patterns, it creates an elegant, uniform light show that reflects the premium nature of the K11 RAR.
Comprehensive Safety & Reliability
Built for longevity and consistent performance, the K11 RAR incorporates RCA metal pressing for secure connections, an upgraded headphone amplifier heat dissipation system, and exclusive phosphor copper shielding to guard against interference. Additional features like DC protection and smart power-saving automatically safeguard your equipment, ensuring worry-free operation.
Technical Details
Colors
Black, Silver
Dimensions
147 x 133 x 32.3 mm (including feet)
Weight
Approximately 420 g
Main Control Chip
GD32F303RET6 (single-chip microcomputer)
DAC
Fully differential true 24-bit R2R resistor arrays
Volume Control Chip
NJW1195A
USB Input
384kHz/32bit, DSD256
Coaxial Input
192kHz/24bit
Optical Input
96kHz/24bit
USB Connector
Type-C
Display
Custom LCD screen
Power Supply
DC12V 2A external adapter
SE Power Output 1
L+R ≥ 460mW + 460mW (32Ω, THD+N <1%) [32Ω/single-ended/high gain]
SE Power Output 2
L+R ≥ 50mW + 50mW (300Ω, THD+N <1%) [300Ω/single-ended/high gain]
BAL Power Output 1
L+R ≥ 1300mW + 1300mW (32Ω, THD+N <1%) [32Ω/balanced/high gain]
BAL Power Output 2
L+R ≥ 220mW + 220mW (300Ω, THD+N <1%) [300Ω/balanced/high gain]
Frequency Response
20 Hz ~ 50 kHz (attenuation <1.3 dB)
SNR
≥115 dB (A-weighted)
Noise Floor
PO < 7.2 μV (A-weighted); BAL < 14.1 μV (A-weighted)
Output Impedance
PO < 1Ω (32Ω load); BAL < 1.5Ω (32Ω load)
THD+N
LO < 0.02% (1kHz/10kΩ)
Processing Time
This product is in Pre-order period. Pre-orders are provided for items that have not reached us and will take some time to be shipped out.
Pre-order Period: Delivery time TBD, depending on your position in the queue.
Note:
- No cancellation of orders once ordered.
- All orders to be shipped out sequentially.
Shipping Policy
Which countries do you ship to?
We are generally able to ship to most countries via Express Shipping, and many countries via Standard Shipping. You may clarify this with our team to check whether Standard Shipping is available to your country.
We cannot ship to addresses that are "PO boxes or APO/FPO".
*Note: Generally, we can only do Selected Shipping to India and Russia. We can only do Express Shipping to Africa, Argentina, Hawaii, Kuwait, Mauritius, Montenegro and Sri Lanka, to name a few.
This may be subjected to changes due to unpredictable issues such as Covid, war, and etc.
How much does shipping cost?
We have two shipping methods - Standard Shipping and Express Shipping.
Standard Shipping is free for most countries, while Express Shipping is 15-35USD depending on your country. If your order is over 270USD, Express Shipping is free*.
*This applies for most countries. However, large items such as headphones and desktop DAC/AMPs (e.g. HarmonicDyne G200, MUSICIAN MDP-2, and etc.) are excluded.
Shipping fees exclude import taxes or processing fees that may be applicable for your country. Linsoul is not responsible for such fees. Should you refuse to pay the tax/customs fees, shipping fees will still be deducted from the amount paid for thetwo-way freightcharges. The cost of the freight charges may be more than the amount reflected on your order due to tax and other miscellaneous fees.
Some parcels claimed to be “returned to the seller” may be destroyed by the post office or customs officers when buyers refuse to accept their parcels or fail to pay for their taxes.No refundwill be processed for such cases.Standard Shipping via YunExpress is a tax-inclusive option for some countries. However, Linsoul will not be responsible for additional administrative or handling fees charged by your local courier company or customs. Please kindly check this with your local customs.For certain remote areas, there may be additional charges via Express Shipping. We will contact you if there is a need to make additional payments. Please contact us before placing an order, should you have any queries regarding shipping.
How long does it take to receive the order after it is placed?
For in-stock products, your order will be shipped within 3 working days. You may check with our staff regarding the in-stock status of any products.
Customized items will take a longer time. Please contact our staff for more information.
On normal non-sale days, once your parcel has been shipped out:
- For Standard Shipping, it takes about 2-4 weeks for items to be delivered after shipping out. For some countries, it might take up to 2-3 months, depending on your country, its customs and other factors.* The duration for transit is something beyond our control. Linsoul will not be making refunds for such cases. Please consider an upgrade to Express Shipping or keep the waiting time in mind.
- For Express Shipping, it takes about 3-7 days for items to be delivered after shipping out.
*Note: Timings might be affected due to festive seasons or other unforeseen circumstances
What happens if the parcel has been shipped but not delivered?
First, kindly contact your local courier using the local tracking number.
If your parcel were to be in transit for at least 3 months, it may have been lost in transit.
For orders below $50USD, you may either opt for a one-time reshipment of parcel OR a full refund of the amount paid in cash via PayPal/Credit/Debit card.
For orders above $50USD, we will only process a 50% refund of your order paid in cash via PayPal/Credit/Debit card. Should there be any concern about Standard Shipping, you are encouraged to opt for DHL Express Shipping instead.
Customers are to bear the consequences and fees incurred, if the parcel was undelivered due to any of the following situation:
- Wrong address or phone number provided by recipient
- Recipient was uncontactable when courier company contacted
- Refusal to sign for the package by recipient
- Lost or damaged parcel because recipient opted for “no-signature delivery”
- Refusal to pay for the local tax/processing fee by recipient
- Refusal to provide supporting documents for custom clearance by recipient
Who will pay for the import tax/custom fees
Customers have to bear any form of custom/import/processing fees that are applicable for your parcel.
Should you be unwilling to pay for the fees and reject the delivery of the parcel, you will still have to pay for the shipping cost. Linsoul will only refund the amount of your order after deducting the two-way shipping fees incurred.
What shipping companies do you use?
We collaborate with these courier companies:
- Standard Shipping: 4PX, UBI, NinjaVan, and Yun Express
- Express Shipping: DHL Express, FedEx and SF Express
Customer Support
How do I get help for my order?
Cancellation or/and modification of orders can only be done manually via our staff, provided that our Warehouse Team has not processed your order.
As our Support Team might not be available during non-working days and weekends, please place your order wisely.
Should you really need to cancel or/and modify your order after purchase, please contact us via our support email (Support@Linsoul.com) or website chat. We will help you with the changes if that could be done.
In general, upon receiving your parcel, please confirm the contents of the package and ensure that the package is in good condition before signing for it. All customers are strongly advised to take an unboxing video of their parcel and packaging when opening their parcels and products.
For faulty/missing items, please send an email to support@Linsoul.com for after-sale services. The following details are required.
- Send an email to support@Linsoul.com with an appropriate Subject Title
- Provide your order number and state the issue clearly
- Attach photos and videos to show that your product is faulty/missing. Shipping details on the parcel packaging have to be clearly visible.
If the photos/videos provided are insufficient to prove the stated issue, we will enquire more. Once the issue has been confirmed, we will arrange for a replacement, partial refund or a full refund (where applicable). For incorrect products, Linsoul reserves all rights in deciding whether you need to return the incorrect item or not. Please kindly contact us via email first. Our team aims to review your email within 3 working days.
For other queries, the fastest way to contact us is via our website or Discord
Linsoul Audio will not be responsible for parcels that have been damaged during the transit process.
Do I get tracking details for my order?
After placing an order, you will receive the order confirmation email. After your order has been shipped out, you will also receive a tracking email. You can track your order via the tracking number online. Should you not have received the emails or face any difficulties tracking your order, please kindly contact us for support.
For more than 1 orders placed under the same account and shipping address, Linsoul will automatically combine the orders and ship them out via one tracking number. Should you have special requests to have the orders shipped separately, please kindly contact us via Discord or our website's chat. We will do our best to help.
How do I cancel my order?
Cancellation or/and modification of orders can only be done manually via our staff, provided that our Warehouse Team has not processed your order. Orders that have been shipped cannot be cancelled and modified.
As our Support Team may not be available during non-working days and weekends, please place your order wisely as support cannot be guaranteed for such requests.
Should you really need to cancel or/and modify your order after purchase, please contact us via our support email (support@Linsoul.com) or website chat. We will help you with the changes if that could be done.
30-Day Return Policy
Where should I send the product for the return process?
To initiate the return shipment, kindly send an email to support@Linsoul.com within 30 days upon receiving the sealed product(s). The RMA form and details will be provided to you via email.
When must the product be returned after receiving the RMA form and details?
After receiving the return instructions from us via email, kindly arrange the return shipment of the parcel within 5 working days, and update us with the tracking link via email again. Failure to do so will result in a cancellation of the return process.
When will I receive my refund after returning the product?
In most cases, after receiving and inspecting the returned product, your refund will be processed within 5 business days. Refunds may incur a currency exchange loss or transaction fee, depending on your source of payment (e.g. Bank or PayPal). Linsoul will not be responsible for such fees.