Name: FiiO K11 – Compact Desktop DAC/Headphone Amplifier, 1400 mW Balanced
Brand: Fiio
Price: 142.99 USD
Availability: InStock

FiiO K11 – Compact Desktop DAC/Headphone Amplifier, 1400 mW Balanced

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FiiO K11 – Compact Desktop DAC/Headphone Amplifier, 1400 mW Balanced

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Truly balanced·Truly brilliantDesktop DAC and Headphone AmplifierVariety of inputs and outputs | 1400mW large power output3 gain levels, 3 volume... Read more

ColorBlack / US

ColorBlack

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Description

Truly balanced·Truly brilliant
Desktop DAC and Headphone Amplifier
Variety of inputs and outputs | 1400mW large power output3 gain levels, 3 volume curves |$pecially-designed audio circuitSpecially-designed power supply| Supports 384kHz/32bit, DsD256Slim build | Custom LCD screen| Adjustable RGB logo lightingMulti-function knob |USB DAC driver-free mode

Specifications

Weight: 200gr
Usage: Indoor & outdoor

Pros and cons

Sustainably produced
Ideal for everyday use
May discolor in direct sunlight

Desktop DAC and Headphone Amplifier

Variety of inputs and outputs |1400mW large power output3 gain levels,
3 volume curves | Specially-designed audio circuitSpecially-designed power supply |
Supports 384kHz/32bit, DSD256Slim build | Custom LCD screen|
Adjustable RGB logo lightingMulti-function knob | USB DAC driver-free mode

Selling points

Over the years, we have launched the K5 Pro, K7, K9, andK9 Pro series of amplifiers at various price points.The K series of amplifiers have sold well around the world.As they have users’ changing and increasingly growing desktop HiFi usage needs.Thanks to continuous research and progressWe have a new understanding of entry-level amplifiers.The K11 will feature lots of connectors, large power output, and a slim build.The beautiful screen is a display of its prowess as your desktop HiFi companion.

A variety of inputs andoutputs ready for you

On the K11 are USB*, optical and coaxial inputs* as wellas 4.4mm,6.35mm, RCA line-out, and coaxial outputsHaving more inputs and outputs than other typical entrylevel amps means the K11 is more than capable ofmeeting your needs of putting together a capable audiosetup.
*USB connection to phones for decoding does not consume the phone'sbattery*Coaxial input and output share the same physical connectorcoaxialoutput can only be used in USB mode

1400mW large poweroutput capably pushing

Under a 320 load, the K11 is capable of pushing1400mW under balance
modes. This allows it toeasily drive many HiFi earphones and headphones
tofully unlock their potential.

<h3>3 gain levels3 volume curves<br/>The K11 has 3 separate gain levels,</h3>

3 gain levels3 volume curves
The K11 has 3 separate gain levels,

each gainlevel having its own volume curve. This allows theK11 to give you a better listening experience withvarious types of headphones, whether you areusing sensitive earphones or harder to drive over-ear headphones.

Specially-designed audiocircuit Specially-designedpower supply

Within the K11's slim build lies a specially-designedaudio circuit designed for great sound quality. This isbacked by more than 16 low-noise LDOs for precisevoltage stabilization and powered by an external 12Vswitching power supply. All of this leads to a purer andmore robust supply of power, leading to stable highquality audio and thus truly enjoyable music all of thetime.

Slim on one sideStable on the other

The slim aluminum alloy body allows you toeasily place the K11 anywhere,
making it easierto put the device in a way that complements therest
of your desk. Thanks to the silicone anti-slippad, the K11
rests stably and firmly on your tableto0.

A beautiful screenFull of clarity

A custom, high-contrast and durable LCD screen*allows
you to easily see the sampling rate, volume.gain,
or output mode with just a glance.
"Durable LCD screen, always on with no burn-in

Adjustable RGB logo lighting

The FllO logo is illuminated with RGB lighting, giving youa
quick way to identify the sampling rate of the currentaudio
being played back. Six LED strips work inconjunction with
a carefully placed reflective film and partsof the body
designed to refect light to make the light showuniform and elegant.
*Brightness, color, and light pattems all adjustable using the knobg state

Driver-free modeWorry-free operation

The K11 used in USB DAC mode does not require adriver
on Windows 10 and above systems, and canalso be used
with video game consoles such as thePS5 and the Switch.
Simply plug and play for worry-free usage whether you are
enjoying music or beingimmersed in games.
*Installing the driver unlocks support for higher sampling rates

Three elegant colorsAdding a dash of liveliness

Obsidian black
Understated chamm, an earthly beauty
Midnight silver:
Exquisitely elegant, stylishly radiant
Titanium:
Retro texture, exuding a gentle and elegantcharm

Basic parameters

Colors: Obsidian black, Midnight silver, TitaniumMain control chip (single-chip microcomputer): GD32F303RET6DAC: CS43198
Supported audio formats:384kHz/32bit PCM, DSD256USB connector: Type-C
792K 48
Display type: Custom LCD
Dimensions:147x133x32.3mm(including feet)Weight: About 407g
Power supply: DC12V 2A external adapter
SE power output 1: L+R≥520mW +520mW (320,THD+N<1%) (320/single-ended/high gain)SE power output 2:L+R≥60mW+60mW (3000,THD+N<1%)(3000/single-ended/high gain)BAL power output 1:L+R≥1400mW+1400mW (320,THD+N<1%)(320/balanced/high gain)BAL power output 2:L+R≥250mW+250mW (300Q,

Packing list

1-----K11 *1
2-----Power adapter (including AC cable)*1
3-------USB A to C cable*1
4------6.35mm adapter*1
5-------Quick start guide*1
6-------Warranty card*1

General Specifications

Name/Model

K11

color

Black/Silver/Titanium

Weight

About 407g

Gain

L/M/H

Driver-free mode (switch mode)

Supported

Max supported sampling rate

192kHz-24bit (Coaxial)96KHz-24bit (Optical)

Adaptive impedance

PO: 8~150ΩBAL: 8~350Ω

Sampling rate indication

LOGO indicator light shows as default: Cyan: 48KHz and below/Yellow: 48kHz and above/Green: DSD

Firmware upgrade

Supports upgrade through USB

Buttons and Ports

Single-ended line-out

RCA port

balanced output interface

standard 4.4mm socket

USB

Type-C (data transmission)

Digital coaxial out

RCA port (only works in USB mode)

Power Supply Parameters

Power Supply

DC 12V/2A

Battery capacity

No battery

Audio Parameters

Parts of performance and parameters of Line-out output (RCA)

THD+N & Noise

＜0.00035% (1kHz/-0.3dB@10KΩ)

Frequency response

20Hz~50kHz: damping＜0.1dB20Hz~20KHz: damping＜0.1dB

Line output level

1.95Vrms

Parts of performance and parameters of headphone output (6.35mm)

Output power

L+R≥720mW +720mW (16Ω, THD+N＜1%)L+R≥520mW +520mW (32Ω, THD+N＜1%)L+R≥60mW+60mW (300Ω, THD+N＜1%)

Output impedance

＜1.2Ω

Peak output voltage

12Vp-p

THD+N & Noise

＜0.00059% (1kHz/-8.1dB@32Ω)

Frequency response

20Hz~50kHz: damping＜0.2dB20Hz~20KHz: damping＜0.1dB

Parts of performance and parameters of headphone output (4.4mm)

Output power

L+R≥570mW+570mW (16Ω, THD+N＜1%)L+R≥1400mW+1400mW (32Ω, THD+N＜1%)L+R≥250mW+250mW (300Ω, THD+N＜1%)

SNR

≥123dB (A-weighted)

Frequency response

20Hz~50kHz: damping＜0.2dB20Hz~20KHz: damping＜0.1dB

Output impedance

＜2.4Ω

Crosstalk

≥106dB

Peak output voltage

24.5Vp-p

THD+N & Noise

＜0.0010% (1kHz/-14.5dB@32Ω)

Noise floor

＜4.9uV (A-weighted)

FAQ

1.Quick start guide, Windows USB DAC driver download link

K11/K11 R2R Quick start guide download link: Click here

FiiO USB DAC driver download (For Windows computer): Click here

2.What should l do if the K11 is abnormal?

[No sound, noise, unable to boot, indicator light off, etc.]

You can try the following methods to help you solve the problem:

1. Restart K11;

2. Re-plug the power cord.

How to restore factory firmware for K11? (K11 comes with backup system. When you meet the system failure (for example fails to enter menu), you can try to restore the factory firmware via the backup system.

1.When K11 is powered off, long press the knob to turn it on. Keep holding when 'FiiO' shows and stop holding when the screen turns off. The display will shows 'bACkUP' and you can enter the backup mode.

2.In the backup menu, click the knob to enter the selection menu, then scroll the knob to select between REVERT/UPDATE/RETURN options.

When selecting 'REVERT', the system will restart and enter the backup system (i.e. factory firmware system). At this time, the system will overwrite the system with part of the code of the backup system, and then restart automatically. Then the basic backup system becomes a normal available system. (Nomater the normal system fails or not, after selecting 'REVERT', the original system will be overwrited with the backup system)

When selecting 'UPDATE', the system will enter the MCU update mode, the display will show 'RETURN'. You could exit the mode after updating.

When selecting 'RETURN', the system will have no operation and restart automatically.

[Over-current protection]

K11 doesn't have overload, over-temperature protection mechanisms but only over-current protection mechanisms.

After the protection is triggered, you must turn off the power to restore it. You can turn it off and then on through the knob, or directly unplug the power supply to restore it.

The over-current protection is to prevent the machine from damaging the earphones. If it keeps triggering and then triggers again soon after recovery, it means that the device has a rare problem and needs to be returned to the factory for repair. Please contact the seller or support@fiio.com about that.

3.What accessories does the K11 include?

Power cable x1

Power adapter x1

USB cable x1

Headphone jack adapter x1

Quick start guide x1

Warranty card x1

4.Operation introduction for K11 and K11 R2R

Setting menu options difference between K11 and K11 R2R

K11 R2R has no FILT option with SAM and IDLE options added. Other setting options are the same as the K11.

1. Power on/off

Plugging in a DC power supply and short pressing the power button (volume knob), the device will be turned on. When the device is on, hold the power button for about 5s to turn it off.

2. Volume knob operation

(1) Switch working mode: Turn on the device. On the homepage, short press the volume knob to enter the working mode menu. Rotate the knob to successively switch between USB IN, OPT IN and COAX IN. After selecting the desired mode, short press the volume knob to complete the switch and return to the homepage.

If no mode is selected, hold the knob to return to the homepage.

(2) Settings menu: Turn on the device. On the homepage, hold the volume knob for about 2s to enter the Settings menu. Rotate the knob to switch between different settings. When the current setting needs to be changed, short press the volume knob, and there will be flashing characters showing up on the menu. At this time, rotate the knob to switch between different settings, and short press the knob to confirm the setting. Then, the new setting will take effect with no character flashing anymore. Other settings can still be changed.

On the settings menu, hold the volume knob for about 2s to return to the homepage.

(3) Adjust volume: On the homepage, rotate the volume knob to turn the volume up and down.

(4) Quickly switch output:

K11: On the homepage, double press the volume knob with physical button to immediately switch between PO and LO.

K11 R2R: On the homepage, double press the volume knob with physical button to immediately switch between PO, LO and LO SE (volume adjustable).

3. Introduction to Settings menu

Settings menuIntroductionGAINH: High Gain, suggested using with high-impedance headphonesM: Medium Gain, suggested using with common headphonesL: Low Gain, suggested using with high-sensitivity headphonesOUT: Switch outputPO: Front panel headphone output, adjustable volumeLO: Rear panel line-out, adjustable volume

PRE: Rear panel line output, adjustable volume(Only support in K11 R2R)

FILT: Digital filter(Only available in K11)1) Minimum phase fast roll-off filter2) Fast roll-off, Phase-compensated filter3) Minimum phase slow roll-off filter4) Slow roll-off, Phase-compensated filter5) Wideband flatness filter6) Non over-sampling filterUAC: USB working mode1) UAC1.02) UAC2.0LCD-b: Display brightness1~3 levels adjustableLCD-T: Screen timeout1/2/5/10/30 minutes adjustable, “0” means constantly onRGb-M: RGB status setting0/1/2/3/4/5/6/7/8 (default)Each represents: Follow the audio, Red, Blue, Cyan, Purple, Yellow, White, Green, Follow a cycleRGB-P: RGB pulsing statusY: RGB light pulsesN: RGB light constantly onRGB-b: RGB light brightness0/1/2/3/4/5 each represents: Off/1/2/3/4/5-level of brightnessUPDATE: Firmware update entranceShort press the volume knob to enter the menu. Select “Y” (yes) on the “Y/N” menu to enter the firmware update mode.RESET: Factory resetShort press the volume knob to enter the menu. Select “Y” (yes) on the “Y/N” menu to factory reset the K11.FW VxxxFirmware versionRETURNReturn to the homepageIDLE:Smart idle time(Only available in K11 R2R in USB mode)Y: ONN: OFFSAM:Oversampling settings(Only available in K11 R2R)NOS: Over sampling OFFOS: Over sampling ON

SAM(Oversampling settings):The default option is OS and over sampling is on. When external audio datas transform to the K11 R2R, it will be oversampled and converted to a 384k sampling rate (in simple word: upscaling). Then the data will be sent to the R2R module for decoding. The purpose of oversampling is to change the distribution of quantization noise and improve the SNR.

The sampling rate displayed on the K11 R2R is still the original sampling rate but not 384k.

When the SAM option is set to NOS, oversampling is off. The audio data will be decoded and processed in its original sampling to present the original sound experience.

IDLE(Smart idle time): This option is for selecting whether to enable smart idle function. The default option is N and the smart idle function is off.

When selecting Y, the smart idle function is enabled: when no playback for 30min, the system will turn off part of the circuit power supply in the background to save power consumption with RGB indicator off automatically. When the K11 R2R resumes playback, the system will restore power supply and enter working state with the RGB on automatically.

5.K11 signal input, output, gain description

[Input supported by K11]

K11 supports USB, Coaxial input, Optical input, a total of 3 input methods, by clicking the volume knob to enter the working mode menu for switching working mode.

(The K11 could remember the selected input mode still after restart.)

[Output supported by K11]

USB input mode: supports coaxial out, rear panel line-out, front panel 6.35mm single-ended headphone output and 4.4 balanced headphone output

Optical/Coaxial input mode: supports rear panel line-out, front panel 6.35mm single-ended headphone output and 4.4 balanced headphone output

[Output selection]

PO: Front panel headphone output, adjustable volume

LO: Rear panel line-out, adjustable volume

Note:

1.Quickly switch output: On the homepage, double press the volume knob with physical button to immediately switch between PO and LO.

2.The coaxial output only works in USB mode. In optical/coaxial decoding mode, coaxial outputs no signal.

[Which gain should I use when using headphones]

K11 supports three levels of gain, toggle switch adjustment, respectively L/M/H, the corresponding gain is 0dB/4dB/10dB.

The gain adjustment needs to be determined according to your earphones. It is recommended to use H gain for high impedance headphones, M gain for normal impedance headphones, and L gain for low impedance headphones. After switching the gain, the output power doesn't change, but the volume level will change. It is designed in order to avoid excessive volume/popping noise after gain switching and to improve the listening experience.

Note: Gain is invalid in LO output mode.

6. How to use the K11 as a USB DAC for mobile phones?

To connect the K11 to an Android phone, player or Apple phone, you need to purchase an additional Type-C to Type-C, lightning to Type-C OTG cable (such as FiiO LT-TC1, LT-LT3) to connect:

1. After the K11 is turned on, use the OTG cable to connect to the mobile phone;

2. K11 input mode switch to USB;

3. K11 output setting: switch to the corresponding output port according to the interface used, switch the headphone or speaker output on the front panel to PO, and switch the line output on the rear panel to LO to decode the audio signal of the mobile phone.

【Android phone】

After the mobile phone is connected to the K11 through the purchased OTG cable, the song can be played on the mobile phone. After being decoded by the K11, it is output from the headphone port to enjoy high-quality music.

[Note] If there is no sound after you connect, you need to pay attention to the following points:

1. Mobile phone playback software settings. If there is a USB output that needs to be turned on, some devices have to turn off the USB output to have sound;

2. Confirm that the mobile phone developer mode has enabled USB debugging;

The mobile phone needs to open USB debugging, open "Developer options", and then open "USB debugging" or "OTG" function;

3. Confirm that the transfer cable supports OTG function, whether the direction of the cable is reversed;

4. Since the USB audio of various brands of mobile phones is not standardized at present, FiiO does not guarantee full compatibility. According to the above connection method, if it is not supported, it is recommended to try other mobile phones or connect to the computer DAC to rule out whether the hardware of some devices is bad (such The probability of the situation is small), if you can’t connect to the computer, you can contact our customer service for further confirmation.

【iPhone/iPad】

It is necessary to purchase a Lightning to Type C cable with OTG function (such as FiiO LT-LT3). Connect K11 and iPhone/iPad/iPod, play songs and enjoy high-quality music.

【Note】

1. Only Apple devices with iOS10.0.2 and above systems are supported. Those with versions lower than this version can not be supported due to the Apple system itself;

2. When the iOS device is decoding, adjusting the volume of the iOS device is invalid and needs to be adjusted on the K11.

7.How to use the K11 as a USB DAC for computer?

【Windows computer】

1. Install the FiiO DAC universal driver on the computer;

Driver download link: Click here

2. K11 input mode switch to USB;

4. Connect the computer and K11 through a Type C USB data cable, set the audio output of the computer system and the audio output of the playback software to K11 and then use it.

5. With a computer: How to play general lossless tracks and music in DSD format? Click to view

【MAC computer】

1. MAC computer does not need to install the driver, just change the sound output device to K11 after connection.

2. It is recommended to adjust the system volume to the maximum, and adjust the output volume of the machine by adjusting the potentiometer.

Apple computer DAC setting introduction: click

Notice:

1. When K11 is connected to Mac, it can play DSD tracks up to DSD128. This is because under OSX, the DoP can only support DSD128 (DSD256 needs to be packaged in 768K under MAC, and K11 supports up to 384kHz).

2. In theory, OSX can connect to K11 to play DSD256 through Native, but the corresponding playback software needs to pass through MFi and support Native output, such as Audirvana Plus, Amara Symphony.

【Linux computer】

The Linux system is driver-free. In theory, it can be used directly by connecting it directly. However, due to the large number of versions, it can not be guaranteed that all systems can be adapted. If it is connected, it is recommended to use another data cable or USB port to check. is not supported.

8.How to use the coaxial and optical decoding function of K11?

1.After powering on the K11, switch the input mode of K11 to the corresponding input: OPT IN (optical fiber), COAX IN(coaxial), and connect to the corresponding optical fiber/coaxial input line;

2.K11 output setting: switch to the corresponding output port according to the interface used, switch the headphone or speaker output on the front panel to PO, and switch the line output on the rear panel to LO to decode the audio signal of the mobile phone.

3.Scroll the volume knob and adjust the volume of the K11 to a suitable level before playing music. And select the GAIN (gain) according to personal preference;

4.Play music on the front device to enjoy the music.

Note: When there is no output from the K7, please try to play other music first.

9.The sample rate supported by K11 and K11 R2R?

USB decoding up to 384kHz/32bit, DSD256;

Coaxial supports up to 192kHz/24bit, does not support DSD64;

Fiber supports up to 96kHz/24bit.

Why can the USB mode sampling rate only support up to 384K/DSD256?

During the debugging process, we found that when decoding some DSD512 and songs with a sampling rate above 768k, there will be some noise. We have tried many times to solve this problem, but we can't completely solve it. Due to the quality control requirements of our company, and there are not many songs with sampling rates above DSD512 and 768k on the market, we finally decided not to support sampling rates above DSD512 and 768k.

10.The RGB indicator light status indication of K11

[RGB Indicator]

1.After powering on, the RGB indicator light is cyan blue and always on when there is no input; after powering off, the indicator light is off;

2. When working in the digital input state (UAC/OPT/COAX), the indicator light will display different colors according to different samples:

48k and below--cyan blue,

above 48k--yellow,

DSD--green;

no signal input--cyan blue and steady;

[Can I turn off the RGB indicator like for the K11?]

Yes, you could set the RGB-b option to 0 in the setting menu to turn off the RGB indicator.

[Brightness, color, and light patterns all adjustable using the knob]

RGb-M: RGB status setting

0/1/2/3/4/5/6/7/8 (default)

Each represents: Follow the audio, Red, Blue, Cyan, Purple, Yellow, White, Green, Follow a cycle

RGB-P: RGB pulsing status

Y: RGB light pulses

N: RGB light constantly on

RGB-b: RGB light brightness

0/1/2/3/4/5 each represents: Off/1/2/3/4/5-level of brightness

11.How to update the firmware of K11/K11 R2R?

K11 firmware download link and update instruction: Click here

K11 R2R: There is no new firmware for K11 R2R currently.

K11 contains firmware of 3 modules:

Decoding module/MCU: Support USB upgrade, upgrade through the USB port on the computer.

12.What power adapter is suitable for the K11?

The AC power input of the power adapter comes with K11 supports AC power between 100V and 240V.

The specification of the DC port for K11 is 5.5x2.1mm.

The DC output of the power adapter comes with K11 is 12V/2A. You could use 12V3A power supply as well. It is recommended to use the power adapter that comes with the K11 or FiiO linear power supply PL50.

13.The difference between K11 and K11 R2R

Outlooking differences: K11 R2R comes with R2R logo while K11 does not have. The other appearances are same,
Internal circuitry differences: K11 uses CS43198 as the DAC chip, while the K11 R2R uses sign-magnitude R2R as the DAC chip. Some of the corresponding circuits are slightly different.
Parameters differences: The THD+N & Noise and noise floor of K11 and K11 R2R are nearly the same.
Software settings function differences: K11 uses the CS43198 as DAC chip so it comes with a filter setting function. The K11 R2R uses sign-magnitude R2R as the DAC chip, so it has no filter function and the filter setting option is removed. But the oversampling mode and smart idlefunction are added for K11 R2R.
In terms of sound, as the first R2R product of FIIO, consumers are certainly more interested in the product's sound performance. After a number of inner comparisons, as well as the exhibition listening, the general feedback is that the K11 R2R has better flexibility in low frequency, thicker vocals and richer feelings, while the K11 is better in resolution!

14. How to update the firmware for K11/K11 R2R?

Before upgrading the firmware for K11, please note the following:

1) Only Windows computers can be used to upgrade firmware, please use computers with Windows 10 or above;

2) In addition to connecting the K11 to the computer, it is recommended to unplug all other devices or decoders on the computer USB interface;

3) During the firmware upgrade process, please do not disconnect the power supply or unplug the USB cable. If there is a power outage, it will actively enter the firmware upgrade state the next time it is powered on.

Update steps:

1. Install the Windows computer driver:

https://forum.fiio.com/note/showNoteContent.do?id=202105191527366657910&tid=17

2. Turn on K11, press and hold the knob for 2 seconds to enter the menu settings, and rotate the knob until the word "UPDATE" appears on the screen. Short press the knob again to enter the "Y/N" option, rotate the knob and select "Y", and short press to enter the firmware upgrade state. At this time, the word "RETURN" is displayed on the K11 screen. Connect the K11 to the computer via USB.

3. Open the "GD32_MCU_HID_IAP_Programmer" burning tool (this tool requires no installation). Note: The setting of "IAP Device" must be "GD32 USB IAP in FS Mode", please do not change it!

4. Click "open" and select the file "k11_app-vxxx.hex".

5. Click "OK" to start the firmware upgrade. After the upgrade is completed, "Download successfully!" will be displayed. Click "确定" and then "Cancel" to exit the upgrade tool.

Note: As shown in the figure below, please click the "Cancel" button in this interface to exit the software; do not click "OK", otherwise the software will re-enter the upgrade state.

6. After the K11 firmware upgrade is completed, the word "RETURN" will be displayed on the screen. Short press the knob to see the "Y/N" option. Select "Y" to exit the upgrade mode. After that, the K11 will restart. You could go to the menu FWxxx to check the firmware version.

Description

Specifications

Pros and cons

Desktop DAC and Headphone Amplifier

Selling points

A variety of inputs andoutputs ready for you

1400mW large poweroutput capably pushing

3 gain levels3 volume curvesThe K11 has 3 separate gain levels,

Specially-designed audiocircuit Specially-designedpower supply

Slim on one sideStable on the other

A beautiful screenFull of clarity

Adjustable RGB logo lighting

Driver-free modeWorry-free operation

Three elegant colorsAdding a dash of liveliness

Basic parameters

Packing list

General Specifications

Audio Parameters

Parts of performance and parameters of headphone output (4.4mm)

FAQ

3 gain levels3 volume curves
The K11 has 3 separate gain levels,