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A hand holds the Sennheiser HD 599 in front of a window with greenery.

Sennheiser HD 599 review

Open-back headphones with a bit of oomph.
By
October 10, 2023
7.5
Sennheiser HD 599
The bottom line
For casual listening at home, it's difficult to beat the comfort of the Sennheiser HD 599 for long sessions. Its open-back design offers almost no isolation and limits where you can use it. For the price, the build quality is average with a lot of plastic, but the removable cables prolong the life of the headset.

Sennheiser HD 599

For casual listening at home, it's difficult to beat the comfort of the Sennheiser HD 599 for long sessions. Its open-back design offers almost no isolation and limits where you can use it. For the price, the build quality is average with a lot of plastic, but the removable cables prolong the life of the headset.
Release date

October 15, 2016

Price

Original: $249

July 2022: $149

Dimensions

3m (cable)

1.2 (cable)

70 x 45mm (ear pad internal)

Weight

250g

Model Number

‎506831

Waterproof
What we like
Very comfortable
Decent bass for open-back headphones
Removable cables
What we don't like
Some distortion with loud volume
Frequency response is not ideal for all music
Adapter is clunky
7.5
SoundGuys Rating
7.7
User Rating
Rating Metric
Our Rating
User Rating
Sound Quality
9.3
8.3
8.0
Bass
8.6
7.7
8.0
Midrange
9.7
7.8
8.0
Highs
9.6
8.3
8.0
Durability / Build Quality
6.7
8.0
8.0
Value
6.9
7.9
8.0
Design
7.4
8.2
8.0
Connectivity
6.5
7.2
7.0
Portability
2.9
6.3
6.0
Feature
6.5
6.6
7.0
Comfort
8.3
8.5
9.0

It can be hard to find headphones that add bass to music without entering skull-shaking territory, but not anymore. With a foot in the camps of both audiophiles and general consumers, the Sennheiser HD 599 seeks to please many listeners, ranging from headphone to music enthusiasts. Can it pull off this hefty task? We tested the Sennheiser HD 599 for two weeks to find out.

Editor’s note: this Sennheiser HD 599 review was updated on October 10, 2023, to include new charts, the AKG K371 in alternatives, and to answer FAQ.

Music fans who like open-back headphones and prefer (high) bass and midrange emphasis to their music will like the HD 599. And anyone looking to invest in headphones for at-home use will appreciate the comfort and removable cables with different lengths on this headset.

What’s it like to use Sennheiser HD 599?

On a wood surface the Sennheiser HD 599 lays on its side showing the cable with pots and window in the background.
How you feel about metal flake earth tones, and whether they suit your decor might play a role in whether the HD 599 is right for your home.

Available in a divisive pearlescent ivory and brown colorway, the Sennheiser HD 599 suggests a retro-futuristic vibe. The ivory is almost the exact same shade as early 1990s beige PC towers with a sheen, while the shape and lines are more modern.

Build quality seems average, with a foam headband covered in brown vinyl, and notched size adjustments. The HD 599 is made mainly of plastic and sports removable velour ear pads with 70mm x 45mm clearance for your ears. These ear pads feel like the midpoint between the stiffer, rougher AKG K702 and the deluxe Beyerdynamic DT 900 PRO X. Clamping force feels secure — not tight and not super loose. Aiding in a comfortable fit, each headphone swivels slightly on horizontal and vertical planes, but does not fold. All of this, in combination with the heat-regulating open-back design, means you can wear the Sennheiser HD 599 for hours at a time even in summer.

A man on a couch rests his head on a pillow while wearing the Sennheiser HD 599 and looking at a phone.
The HD 599 is a rare example of over-ear headphones you can wear while horizontal without ruining the fit.

For a fuss-free experience, you ought to use the Sennheiser HD 599 in a quiet space at home. The long cable allows you to hook it up to your computer or home listening setup, and sit across the room relaxing. You can use the HD 599 for critical listening, but you may find the sound is not studio grade enough to rely on it for accuracy. This is totally fine — most of us listen to music for pleasure and not as our job, after all.

Included with the 250g headset are two removable cables and an adapter from 1/4-inch to 3.5mm. The thicker 3m cable terminates in a 1/4-inch jack and the skinnier 1.2m cable has a 3.5mm jack, and you get a somewhat clunky 1/4-inch-to-3.5mm adapter too. You basically have to give the cable a quarter turn to unlock the cable’s TRS connection to the HD 599 to swap it out.

Does the Sennheiser HD 599 have good isolation?

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If you want isolation you will need to consider closed-back headphones. Open-back headphones are like the ultimate transparency mode: you hear your environment, and everyone hears your music. You’ll want to listen in your private office or while relaxing on the couch without others around. Most of us do not have ideal environments. Even when I’m home alone, I can still hear the neighbor mowing the lawn through the HD 599 if my window is open.

How does the Sennheiser HD 599 sound?

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Paired with the right source material, the 38mm dynamic drivers make the HD 599 sound good. However, the frequency response we measure deviates from our headphone preference curve, which we consider to work best for the majority of source material and listeners. There’s a sizeable volume bump where the low mids meet with the bass frequencies. While Sennheiser imbues the HD 599 with a favorable curve in the highs (i.e., it’s sort of close to our ideal before 10kHz), the exaggerated low-mids and bass can make that added treble clarity and detail get lost, especially above 10kHz.

You can still hear upper harmonics and overtones, but you might find the uppermost octave to be lacking, especially during very complex tracks. It also depends on your source material, because this curve works just fine with some genres like electropop or new wave.

The Sennheiser HD 599 rests on top of an audio interface with the 1/4-inch cable held in a hand inserting it into the headphone output. A wrapped 3.5mm cable rests nearby.
You get two cables with the HD 599. One terminates in a 1/4-inch jack and measures 3 meters, and the other terminates in a 3.5mm jack and measures 1.2m.

It’s unusual to find a set of open-back headphones with bass exaggeration, as those frequencies tend to get lost with open-back designs. The HD 599 does indeed roll off the sub-bass, but it exaggerates where a lot of bass instruments reside.

No, your ears have a much more limited range of hearing than the headphones’ stated output range. Also, there’s no tolerance specified here, which means that the transducers will output some energy to the extremes of this range, you just won’t hear much of it.

Our frequency response chart shown above gives an accurate representation of the real-life response of these headphones when placed on our acoustically representative test head with realistic ear simulators.

Lows, mids, and highs

A close up of a man wearing the Sennheiser HD 599 holding the ear cup.
The HD 599 skimps on the highest highs and the lowest lows at the extremes of your hearing range.

Listening to The Rock by The Aluminum Group, vocals come through clearly with the keys. The kick drum thumps with a good amount of volume. The bass guitar could be a little louder, especially on the lowest notes. Finally, cymbals and snare suffer from some inaccuracy that makes them slightly “hollow” sounding. For reference, this comparison is against the KZ ZSN Pro X, which has more volume above 10kHz and follows our ideal closely through the mids and bass. In contrast, the male vocals, piano, horns, and strings, which make up most of the song, sound pretty good.

Trying a shoegaze track with high vocals like Sweetness and Light by Lush, the guitar volume seems too loud relative to everything else, while the soprano vocals are overwhelmed by the guitars (even for shoegaze). Cymbals crash too quietly relative to the snares, though percussion overall is at a good volume. Meanwhile, the kick drum is audible, but the bass guitar is far too quiet. It’s really tempting to turn up the volume to better hear parts, though I’m aware I will only hear more guitar. This sound is not horrible but leaves room for improvement.

Chart shows the equalizer suggestion for the Sennheiser HD 599.
One thing to remember is that pushing the volume on the sub-bass frequencies can lead to distortion (THD) with this headset.

Above is a good starting place to tweak the EQ on the Sennheiser HD 599. Take your favorite equalizer and basically turn up the lowest and highest frequencies, and turn down between 70Hz to 1kHz, and 3-8kHz. Conversely, just download our Wavelet EQ settings and give that a whirl.

Should you buy the Sennheiser HD 599?

A close up photo of the Sennheiser HD 599 resting on its side on a turquoise surface with a TV in the background.
With its comfy headband and ear cups, the HD 599 is a good companion for relaxing at home.

Not quite audiophile-grade and not quite consumer-oriented in sound, the Sennheiser HD 599 occupies an unusual space where it ticks a lot of boxes, though not all. For the price, it does a good job of feeling super comfortable and has some frills like removable cables and ear pads. Those of us who don’t like “V-shaped” frequency responses, but do like a little more bass and midrange emphasis than what studio headphones offer will mostly enjoy the sound of the HD 599. You would not want to mix music on it, but it’s great for binging Netflix and podcasts.

However, if you don’t live alone or have a room sequestered away from family or roommates to listen in private, the HD 599 has some limitations in its use. This is true of all open-back headphones, but even so, it bears mentioning because the HD 599 is already a sort of niche product. I would not hesitate to recommend the HD 599 for pop music fans, except for fans of Beats-style headphones or folks who want very neutral headphones. Liberal use of equalization will really make this comfortable set of headphones shine a bit brighter.

Sennheiser HD 599Sennheiser HD 599
Sennheiser HD 599
MSRP: $126.46
The Sennheiser HD 599 SE in black/silver against a white background.
Sennheiser The only difference between the Sennheiser HD 599 SE and HD 599 is the paint.

The Sennheiser HD 599 SE is just a black/silver version of the Sennheiser HD 599. Other than the new paint job, you get the same two cables and the same set of ear pads as you’ll find with the standard HD 599. The HD 599 SE from Sennheiser retails for $199, but if you see it on sale, it’s the exact same internals and fit as the HD 599. So grab whichever is on sale (or appeals more to your taste).

What’s the difference between the Sennheiser HD 599 and Sennheiser x Drop HD 6XX?

The Sennheiser HD 6XX headphones in black against a blurred out blue, shimmering background.

While you might look at the names and think the Sennheiser x Drop HD 6XX is one number higher, so it must be better, you’d be mistaken as these two headphones do not have quite the same purpose. Though nobody can blame you for inferring a similarity through Sennheiser’s naming scheme, the HD 6XX, unlike the HD 599, is meant for critical listening.

In everyday terms, the HD 599 excels at casual music and media consumption, while supplying a comfortable fit. In contrast, the HD 6XX offers a more “flat” frequency response designed for critical listening and mixing audio. You can listen on the HD 6XX for fun as well, but its studio-style sound will be notably more subdued in the low frequencies, even though both headsets have a sub-bass roll-off. The highs, particularly above 10kHz, will be more audible on the HD 6XX as well.

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Besides these case use differences, both headphones are open-backed with primarily plastic builds using velour ear pads. The HD 599 edges ahead in comfort, as the HD 6XX can feel tight after an extended session. Both headphones have removable cables but use different connections. While the HD 599 requires a single cable with a TRS 3.5mm locking end into the headset, Sennheiser ships the HD 6XX with a Y-split cable with a two-pin connection to the headphones. The former is actually a less obstructive solution, but harder to replace. Finally, the Sennheiser HD 6XX may need a headphone amp to really access its potential, while the HD 599 does not.

Sennheiser x Drop HD 6XXSennheiser x Drop HD 6XX
Sennheiser x Drop HD 6XX
Sound quality • Removable/replaceable cable • Open back
MSRP: $399.00
If you're looking for a set of headphones to stay by the computer, few offer a better price-to-performance ratio than the Drop x Sennheiser HD 6XX. Based on the design of the legendary Sennheiser HD 650, the HD 6XX is a steal at half the price.

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While not totally dissimilar, the Massdrop (these days just “Drop”) collaboration with Sennheiser HD 58X Jubilee has a much more “neutral” sound aimed at yielding audio free from undue over-emphasis of any frequency. It’s fairer to compare the HD 58X to our studio curve, rather than the consumer curve, for this reason. The HD 58X also has more in common with the HD 6XX than with the HD 599.

Both the Sennheiser HD 599 and HD 58X are open back, so you get about the same amount — nearly zero — isolation. In terms of comfort, the HD 599 rates as far more comfortable. Even though both headphones are built mainly of plastic, the ear pads have more give on the HD 599 with a lighter clamping force. Like the HD 6XX, the HD 58X has the same Y-split cable configuration. Which you ought to pick up relies entirely on your case use.

Massdrop x Sennheiser HD 58X JubileeMassdrop x Sennheiser HD 58X Jubilee
Massdrop x Sennheiser HD 58X Jubilee
Overall sound quality • Comfortable • Strong removable cable
MSRP: $170.00
For $170 USD, the HD 58X Jubilee from Sennheiser and Drop (formerly Massdrop) is hard to beat. Those who just need a dedicated pair of listening headphones for your desk or listening station, get this set of open-back cans.

What are some alternatives to the Sennheiser HD 599?

The Audio-Technica ATH-M50x from the side with the headband expanded to show the metal notches.
Built mostly of plastic, but the ATH-M50x has metal where it counts.

The Audio-Technica ATH-M50x features more bass and closed-back ear cups. It’s suitable for listening to most kinds of music, and it isolates significantly better than the Sennheiser HD 599. The fit of the ATH-M50x is reasonably comfortable, though, not as forgiving as the HD 599. On the other hand, the closed-back design is more versatile in less-than-ideal environments extending its flexibility for $169 at Amazon. You can also try its optional hardwired or Bluetooth-friendly counterpart, the ATH-M50xBT2 ($198 at Amazon).

The AKG K371 wired over-ear headphones' ear cup rotated back 45 degrees while being worn by a woman in profile.
You can flip the ear cup up on the AKG K371.

Keeping in the vein of closed-back headphones, the AKG K371 is one of our favorite pairs of value-to-performance wired headphones. They provide excellent sound, do not require a headphone amp, and they’re not too pricey either ($176 at Amazon).

For an open-back alternative, the Philips Fidelio X3 $139 at Amazonboasts a fairly neutral frequency response, and it’s comfortable for folks with glasses. This relatively accurate-sounding headset means what you hear is basically representative of how the audio is mixed on larger 50mm drivers. Like the Sennheiser, the Philips Fidelio X3 possesses the same limitations of open-back designs, including virtually zero isolation.

Beyerdynamic DT 900 Pro X laying on table
Upgrade to the Beyerdynamic DT 900 PRO X for better sound quality.

Of course, if want you really want are open back headphones with a more neutral frequency response, the Beyerdynamic DT 900 PRO X delivers. The price is a bit more dear ($269 at Amazon) but, it’s more versatile and playback is more representative of your source material.

Frequently asked questions about the Sennheiser HD 599

Sennheiser appears to market the HD 599 as a kind of budget audiophile headset. Given that audiophiles tend to develop their own tastes and usually have multiple pairs of headphones, the HD 599 can fill a niche. It is not objectively the most accurate, or the most consumer-focused set of cans, but it has a specific high bass and midrange emphasis that can appeal to some people looking for that sound quality.

Nope, the Sennheiser HD 599 has an impedance of 50Ω and a sensitivity rating of 106dB SPL (1kHz/1Vrms), so you don’t need an amp.

The Sennheiser HD 599 does not have an in-line remote with any controls. The cable just has a basic 3.5mm headphone without any added buttons.