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AKG K840 KL - Black

Kleer Technology Lossless Wireless Music Streaming from Portable Player


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Wireless and Sound Quality United

In many cases, portable wireless music streaming has meant a convenient novelty at the cost of sound quality. The AKG K840 KL featuring Kleer technology is the AKG solution to wireless music streaming. With Kleer technology, the AKG K840 KL streams lossless, CD-grade music from a portable device directly to the AKG K840 KL headphones. The overall experience of the AKG K840 KL is among the cleanest portable wireless headphones.

The Sound of quality

Sonic Electronix, one of the leaders in car audio, recently visited Harman, the premium global audio and infotainment group, at their research and development locations in Northridge, California and Detroit, Michigan. The purpose of these visits was to utilize and combine the powerful brand of Harman and the industry leading knowledge behind Sonic Electronix to begin working together on developing future car audio projects.

Product Features:

  • Over-head, wireless on-ear headphones
  • Uncompressed sound from wireless streaming
  • With the included adapter connected to a portable device, the headphones receive a high fidelity wireless sound
  • Compatible with iPod, iPhone, and iPad
  • Uncompressed 16-bit stereo over 2.4GHz
  • Extended battery life up to 2 weeks of regular use
  • Approximately 65.6ft range
  • Lightweight and comfortable for extended periods of use
  • Volume controls on earcup for convenient and easy volume adjustment
  • Compatible with iPhone, iPod, and iPad
  • Hardcase and Charger included
  • 3D-AXIS folding design makes for a portable and easy to store headphone
  • May also be used as a standard headphone via 1/8" (3.5mm) stereo mini port universal gold-plated contacts
Technical Specifications
  • Dynamic drivers
  • Closed back headphones
  • Black with aluminum accents
  • Frequency response: 10-31,000Hz
  • Sensitivity: 120dB
  • Impedance: 32 Ohms
  • Maximum input power: 25mW
  • Charging cable length: 4.9ft
  • Bypass cable: 3.9ft
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Headphone Design

Headphone Type

Headphone type refers to the construction of the headphones.

Around the Ear means that the headphones wrap around the ear to provide a secure fit. This is most often seen in active and sports headphones.

Around the Neck means that the headphones wrap around the neck. This is also seen in active and sports headphones.

Earbuds means that the right and left sides of the headphones are separated and will fit securely into the ear. These are small, compact, and user friendly.

Over the Head headphones mean that the right and left speakers are connected with a support that goes over the head and rests on top. This is the typical headphone type.

Over the Head
Earpiece Design

This is the design of the earpieces on the headphones. Some headphones go inside the ear, while others rest on the outside of the ear. This helps you know exactly what type of headphones you will be receiving.

In-Ear: The ear buds go into the ear. Most often, the right and left ear buds are two separate pieces.

Enclosed-Ear: Usually are found on the larger headphones. They rest on top of the ear and have padding for comfort, as well as enclosing the ear to the speaker. This type of headphone helps to filter out surrounding noise.

On-Ear: This type of headphone involves the speaker sitting gently on the ear without going in the ear or sealing it off.

Specifically For
Some headphones can use an IR Transmitter in your vehicle, while some can be plugged into your media device and be used on the go or at home.

This is the lifestyle that the headphones are designed for. Each style has unique features that make it perfect for particular people.

Designed for those that are active. These headphones are made to stay in the ear during workouts. Whether you frequent the gym a lot or go running outside in the fresh air, these active style headphones will be your best friend.

For those that need the best in music quality. These audiophile headphones are engineered to produce high fidelity and accurate audio replication.

Disc Jockeys (DJs) require a special type of headphone that can meet their professional needs. These headphones are durable, loud, and will often allow for one ear listening.

Fashion Enthusiast:
For those that want to make a fashion statement with their headphones. Not only are these headphones designed with great sound quality in mind, but also great looks!

This lifestyle speaks for itself! If you love video games and want a pair of headphones that will deliver explosive sound and allow you to communicate with others, this is where you need to shop!

Music Lover:
These headphones are made to sound great. They are designed to produce rich, brilliant sounds that will play your music in a manner that the artists would appreciate. These headphones are for those that love music.

Musical Production / Recording Artists:
You're a music creator. Whether you're producing and mixing it down or in the studio recording yourself, you need a pair of headphones that will reproduce the music perfectly without any coloration. Look here for reference quality studio monitoring headphones.

Headphones need to be affordable and durable to keep up with the student lifestyle. A variety of styles can be considered a pair of student headphones.

Those that often find themselves on planes or on the road a lot. These headphones are compact, lightweight, and have a portable design. Some of the headphones in this lifestyle will feature noise cancellation technology that will help shut out outside noise.

Music Lover

General Features

Noise Reduction technology removes unwanted noise from a signal. Background or ambient noise can be removed to produce clearer speech and enhanced hearing. Typically these Active Noise Canceling (ANC) headphones are powered and use batteries to activate the noise canceling technology. Also referred to as Noise Reduction or Noise Cancellation.
Headphone Connection
This is how the headphones connect to the audio source.

Corded means that the headphones use a cord to transfer the audio signal.

Wireless means that the audio signal is transmitted wirelessly to the headphones.

1/4" Stereo Jack Adapter
Some headphones will come with a 1/4" stereo jack adapter to connect the usual 3.5mm jack to a 1/4" stereo plug.

1/4" Stereo jack is a larger audio jack that select electronics have.

Volume Adjustment
Volume Adjustment means that the headphone (independent of the source) can adjust the playback volume. Many headphones and ear buds have in-line volume control, which allows adjusting the audible volume from a switch on the headphones cord. Other headphones have a volume knob on the headphone can.
Built-In Microphone
This means that the headphones or earbuds have a built-in microphone. This can be a microphone on the cord, built into the headphone, or even a boom microphone. These mics can be used for music devices like iPods, for Smartphones to make and receive calls, or for gaming purposes.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
10 - 31000 Hz
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
120 dB
Driver Type
The physical design of the driver in the headphones.
The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
32 ohms
Primary Color
This is the main color of the item.
Secondary Color
A color that compliments the main color of the product.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating

Dieter Bernhard


A Good Purchase

March 10, 2013

The workmanship is excellent.
The diameter of the earphones could be a little bit bigger, then it would be the optimum.

9 of 10 found this helpful

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Great, but...

January 13, 2014

It's an amazing wired headphone and a great wireless headphone. So many and good accessories. The only important con is the range, because it doesn't work when I put de transmitter in my pocket, what is really bad (you can't use it walking arround pluged into your phone).

4 of 7 found this helpful

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September 1, 2014


3 of 7 found this helpful

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B Maestro

Colorado Springs, CO

No Doubt, BEST!

July 24, 2012

I want to say up front, that these headphones were purchased to replace my bluetooth Beats.

Now when I got them and set them up and they worked, I was immediately relieved. because I went through 2 of the beats before I shopped these. The connecting of the devices was pretty simple. Im not a genius, but I didnt even need the manual. That was a relief to have them work the first time. Maybe not everyone feels the same, but when you spend this much money and are let down 2 times!!!!!!! especially when the first one was a dud right out of the box. and the second one worked for 2 months. Thank GOD they took them back so S.E. could hook me up on these. I have owned AKG before, but not in over 10 years, so I was unsure if the products were still the same. Well, they are. For headphones that are this light, they really pack a punch. They have incredible range, so while im working around the house, I have both hands to work with and no wire tangling me up! I love them. Sound quality is 9 out of 10. I remember my old open air AKG's were a little fuller, but for wireless streaming, these are incredible. separation between all the voices and instruments, balanced, but dont over saturate any frequencies. These are the best wireless I have ever used. and about 1/10th the size of my Sony wireless! the sound that emits from these little headphones would rival the best. very, very happy. keep it up AKG

3 of 8 found this helpful

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Hong Kong


November 6, 2014

Bought it at a low price with excellent quality. The delivery with a good shocking protection packing. The inner box is in very good condition after a long distance delivery (from US to Hong Kong).
Highly recommend this shop!!

2 of 7 found this helpful

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Accessory Tools and Products

Accessories added

CYK Studio Headphone T-Stand (White)

Stylish Headphone Stand w/ Silicon Cable Holder

Your Price $24.99

Browse 1 question and 2 answers
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Why did you choose this?
Sonic Electronix Store
YAN L on Nov 13, 2014
wireless-akg-Lossless that's all
FENG H on Nov 7, 2014

Product Summary


Model Number

K840 KL





Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: AKG K840 KL - Black