Sennheiser HD 650 Wired Over-Ear Audiophile Reference Headphones

HD 650

A benchmark for total audio immersion, the HD 650 reproduces the subtle details in your music with the same confidence as the highlights. With a fluid signature tuned for hours of fatigue-free listening, it is the headphone to reach for when the music matters most.

The (high) definition of smooth.

With expertly balanced acoustics, luxurious construction and timeless design, the HD 650 has all of the perks of a high-performance sports car and none of the quirks. This open-back headphone is beloved by audiophiles for its musical, non-fatiguing sound while still offering intimate levels of detail. Upon the first note, your favorite tracks reveal their true potential, and each moment of that performance becomes an opportunity to react all over again. For the hi-fi enthusiast that prioritizes engaging sound quality the HD 650 is an instant upgrade.

Imaging your Imagination

The HD 650's signature sound starts with our in-house acoustics. Audiophiles know that the best components perform at their peak when nothing stands in their way. It's no surprise that the response and dimensional soundstage of the HD 650 are smooth-its open earcups provide each and every soundwave ample room to expand as they would in nature. The 42mm transducer deploys a 38mm diaphragm with aluminum voice coil specifically tuned for extended, critical listening: overall treble and low-frequency presence are effortless while midrange is reproduced with lifelike composure-none sacrificing their organic roots to get there. Modern high-resolution sample rates benefit especially well from the HD 650's willingness to reveal subtle nuances without resorting to over-hyping the treble range. Each transducer manufactured is measured against rigid specifications and paired with a perfect match for consistent representation of the entire frequency spectrum in both channels. By reducing variances between left and right channels, the headphone reproduces mastering-grade sound independent of room acoustics or loudspeaker positioning.

Made For More

Everything about the HD 650 was made with more in mind: more details discovered, more musicality, and definitely more time for blissful listening. Made in Ireland at a state-of-the-art production facility, the HD 650 combines the best of modern transducer manufacturing with the attention to detail required to handle a wide variety of acoustic materials. Our production tolerances are extremely tight, ensuring that your HD 650 experience is consistent with those all over the globe, whenever or wherever it was purchased. For example, the resonators feature stainless steel mesh to guarantee uniform performance after manufacturing. Even better, most parts on the HD 650 are modular, making them a dream to keep as your go-to hi-fi playback headphones for as long as you cherish them. From the velour pads to the earcup grille pattern, each component was crafted to guarantee a next-level personal sound experience so you can enjoy your music even more.

It's All About Connection

Your HD 650 comes with a detachable, impedance-matched cable with ultra-low capacitance. The ¼-inch / 6.3mm stereo connector offers the audiophile-standard plug for connection to devices such as headphone amplifiers and A/V receivers, digital audio players, analog gear, and more. At 9.8 feet / 3m long, it offers unencumbered listening on gear deep within your shelves or in a favorite listening chair. A premium adapter is included to reduce the 6.3mm to 3.5mm / ?-inch for plugging into countless other audio devices.

K11 - Truly balanced, Truly brilliant - Desktop DAC and Headphone Amplifier

Variety of inputs and outputs | 1400mW large power output
3 gain levels, 3 volume curves | Specially-designed audio circuit
Specially-designed power supply | Supports 384kHz/32bit, DSD256
Slim build | Custom LCD screen| Adjustable RGB logo lighting
Multi-function knob | USB DAC driver-free mode

Over the years, we have launched the K5 Pro, K7, K9, and K9 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 progress
We 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 and outputs ready for you

On the K11 are USB*, optical and coaxial inputs* as well as 4.4mm, 6.35mm, RCA line-out, and coaxial outputs*. Having more inputs and outputs than other typical entry-level amps means the K11 is more than capable of meeting your needs of putting together a capable audio setup.

*USB connection to phones for decoding does not consume the  phone's battery
*Coaxial input and output share the same physical connector;  Coaxial output can only be used in USB mode

1400mW large power output - Capably pushing headphones

Under a 32O load, the K11 is capable of pushing 1400mW under balance modes. This allows it to easily drive many HiFi earphones and headphones to fully unlock their potential.

3 gain levels - 3 volume curves

The K11 has 3 separate gain levels, each gain level having its own volume curve. This allows the K11 to give you a better listening experience with various types of headphones, whether you are using sensitive earphones or harder to drive over-ear headphones.

Specially-designed audio circuit - Specially-designed power supply

Within the K11's slim build lies a specially-designed audio circuit designed for great sound quality. This is backed by more than 16 low-noise LDOs for precise voltage stabilization and powered by an external 12V switching power supply. All of this leads to a purer and more robust supply of power, leading to stable high-quality audio and thus truly enjoyable music all of the time.

Slim on one side - Stable on the other

The slim aluminum alloy body allows you to easily place the K11 anywhere, making it easier to put the device in a way that complements the rest of your desk. Thanks to the silicone anti-slip pad, the K11 rests stably and firmly on your table too.

A beautiful screen - Full 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 FIIO logo is illuminated with RGB lighting, giving you a quick way to identify the sampling rate of the current audio being played back. Six LED strips work in conjunction with a carefully placed reflective film and parts of the body designed to reflect light to make the light show uniform and elegant.

* Brightness, color, and light patterns all adjustable using the knobg state

One knob - One source of total control

In the K11's minimalist design, the volume knob acts as a crucial source of total control. The K11's multi-function volume knob is used to power the device on and off, for menu operation, for volume adjustment, and for other functions. The knob is designed so that you can quickly execute various complex actions by simply pressing and turning the knob. You can also quickly switch between LO/PO* modes by double-pressing the knob, making it easier for you to appropriately connect to different headphones or audio setups. 

*LO/PO modes remember the last volume set in each mode independently, no need to readjust the volume when switching between modes

Driver-free mode - Worry-free operation

The K11 used in USB DAC mode does not require a driver on Windows 10 and above systems, and can also be used with video game consoles such as the PS5 and the Switch. Simply plug and play for worry-free usage whether you are enjoying music or being immersed in games.

*Installing the driver unlocks support for higher sampling rates

Two elegant colors - Adding a dash of liveliness

Obsidian black: Understated charm, an earthly beauty

Midnight silver: Exquisitely elegant, stylishly radiant