Massdrop x Sennheiser HD 6XX Headphones

Massdrop x Sennheiser HD 6XX Headphones

Complete Setup:
Drop TRRS Balanced 2.5mm Headphone Cable
Drop + THX AAA™ 789 Linear Amplifier
Drop Premium Earpads
Add Drop 3-year Warranty with Accidental Coverage (US Only) +$30.00
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Our All-Time Best Seller

If you know audio gear, you know the Sennheiser HD 650. The company’s flagship from 2003 to 2009, this open-back headphone has shown serious staying power. Praised for its richly detailed, effortlessly enjoyable sound, it remains one of the most talked-about products on Head-Fi today—and is still widely considered among the best headphones under $1,000. So when we teamed up with Sennheiser on its first-ever community-driven design partnership, the HD 650 was a natural place to start. A new revision of the popular all-rounder, the Massdrop x Sennheiser HD 6XX has that same great sound plus a few updates, and a price that makes it even easier to love.

Massdrop x Sennheiser HD 6XX Headphones

Refreshed Aesthetic, Improved Utility

Crafted with the modern audiophile in mind, the HD 6XX replaces the HD 650’s gray colorway with something darker and more dramatic: a deep midnight blue. The silver nameplates have been swapped for black plates with contrasting silver text—and the Massdrop logo is silk-screened on the inside of the headband, just above the right cup, with the serial number located just above the left cup. Based on feedback from the community, this iteration has also been updated with a detachable 6-foot cable (compared to the original’s 10-foot cable) and a ⅛-inch plug, which is more versatile for everyday laptop, phone, and DAP use than the standard ¼-inch plug. Of course, the HD 6XX comes with a ¼-inch adapter for those who want it.

Massdrop x Sennheiser HD 6XX Headphones
Massdrop x Sennheiser HD 6XX Headphones

Classic Sennheiser Sound

Good news for fans of the HD 650: In this revision, the driver structure and sound signature haven’t changed a bit. You’ll get the same smooth, laid-back presentation, with a balanced midrange and natural-sounding bass. The HD 650 is considered more refined and better damped than its predecessor, the HD 600, with less energy in the upper midrange (which some listeners may find less fatiguing) and an overall balance that’s a bit warmer and bassier. Its neutral response provides a pleasant listening experience with any musical genre from a range of sources. Plus, it responds well to improved sources and amplification, and headphone amplifiers of any output impedance could potentially make a good match.

Massdrop x Sennheiser HD 6XX Headphones

Final Thoughts

Because the HD 6XX’s open-back design won’t isolate you from outside noise or prevent sound from being heard by those nearby, it may be best-suited for quieter home and office environments. Like all headphones in Sennheiser’s HD 600 line, this new model can be disassembled by hand to its component parts, all of which can be easily replaced. Many of its parts are interchangeable with others in the series, and owners of the HD 6XX can benefit from the rich aftermarket and brain trust of modifications and gear matching—along with excellent long-term support from Sennheiser itself.

Massdrop x Sennheiser HD 6XX Headphones
Massdrop x Sennheiser HD 6XX Headphones

Optional 2.5mm Balanced Cables

Designed specifically for our Sennheiser HD 6XX and HD 58X headphones, these balanced headphone cables allow you to confidently plug in your headphones to 2.5mm compatible digital audio players, portable amps, and the latest premium audio devices. Made with a durable PVC jacket with a similar weight and feel to the stock Sennheiser cables, these cables will feel right at home on your existing pair. Use one together with our 4-PIN XLR-to-2.5mm adapter and take advantage of the balanced, ultra-clear sound and power of the THX AAA 789 Linear Amplifier.

Massdrop x Sennheiser HD 6XX Headphones

Optional Massdrop Objective 2 Headphone Amp: Desktop Edition

In 2011, audio engineer NwAvGuy published a blog post titled “O2 Headphone Amp,” in which he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design. Our version of NwAvGuy's famous O2 amplifier, the Objective 2 Desktop Edition features updates based on feedback from the community. It’s an ideal baseline reference amplifier, capable of powering everything from IEMs to HD 800s with linear ease. We recommend the medium gain version if you plan to primarily use this amp with IEMs. If you don't plan to use IEMs, if your headphone has a 300-ohm or higher impedance, or if your source is weak (less than 2V output), opt for the standard gain version to ensure enough power.

Massdrop x Sennheiser HD 6XX Headphones

Optional Massdrop O2 + SDAC DAC/Amp

For the objectivist audiophile seeking a complete desktop solution, there’s the Massdrop O2 + SDAC: a DAC/amp that brings two great products together in one affordable, easy-to-use package. It features the Massdrop Objective 2 (or O2), the community’s favorite solid-state amp, alongside the Massdrop x Grace Design Standard DAC (or SDAC), a collaboration with a company long known for its incredibly accurate, transparent studio gear. The result is an all-in-one unit that measures objectively well and works with a variety of headphone impedances. Plus, its small form factor is designed to stack with the Massdrop × Cavalli Audio Liquid Carbon X Amp and other Massdrop Made audiophile products.

Massdrop x Sennheiser HD 6XX Headphones

Sennheiser Brand Spotlight

jude's Review on Head-Fi TV


Massdrop x Sennheiser HD 6XX Headphones

  • Massdrop x Sennheiser
  • Color: Midnight blue
  • Transducer principle: Open, dynamic
  • Frequency response: 10 Hz – 41 kHz
  • THD: < 0.05%
  • Nominal impedance: 300 ohm
  • Cable length: 6 ft (1.8 m)
  • Connector: ⅛ in (3.5 mm)
  • Weight without cable: 9.2 oz (260 g)
  • Made in Romania 


Massdrop x Sennheiser HD 6XX Headphones
Massdrop x Sennheiser HD 6XX Headphones


Massdrop x Sennheiser HD 6XX Headphones 

  • ⅛–¼ in (3.5–6.35 mm) adapter
  • 2-year manufacturer’s warranty 

Drop Extended 3-year Warranty with Accidental Coverage

Drop is offering a purchasable extended warranty with accidental coverage for this product. Select the option at checkout, and your purchase will be protected from drops, spills, accidents, and everything but theft for 3 years. See the full details of our warranty program here.


We get it. Sometimes what you ordered just doesn’t work out. If that’s the case for you, don’t fret! All customers (both US and international) may return this item in new, unused condition within 30 days of delivery.


Estimated ship date is Feb 2, 2022 PT.

Payment will be collected at checkout. Cancellations are accepted up to 2 hours after checkout for in-stock items, or up until pre-order ships.

Top Customer Questions328
What’s the difference between the HD6XX and the HD650?
Jul 15, 2019
Top Answer
There is no difference other than branding - these will have Drop logos/HD6XX printed on the headband, while the 650 will have no Drop logo and will say HD650 instead. Acoustically, they are...Read More
Oct 3, 2019
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What is the best amp (or amp/dac) to pair with the HD6XX?
Jul 15, 2019
Top Answer
They go well with my Modi/Magni Schiit stackRead More
Oct 3, 2019
See 65 More
What are "open back headphones"?
Sep 11, 2019
Top Answer
Open backs project sound both towards your ears and out the sides of the earpieces. This makes the sound feel as if they are coming from further away. Good for replicating the directions of where...Read More
Oct 3, 2019
See 6 More
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