After thoroughly testing them, we are ready to write our review of the HE-R9, closed-back headphones from Hifiman, which are highly unusual not only in design, but also because they use dynamic drivers instead of the planar magnetic drivers that are typical of the Chinese company, and because of their unique sonic signature, which some people may love, but not everyone will appreciate.
We should note that we tested these headphones both in wired mode and with the Bluetooth module. For enthusiasts who want to listen wirelessly, it is worth remembering that they can use the Bluemini R2R module, available either in a bundle or separately (meaning that users who already own this module—for example because they have a pair of Deva Pro at home—can move the module freely between devices, including the HE-R9).
That said, let’s start by examining some technical specifications:
- Frequency response: 15Hz–35kHz
- Impedance: 32 ohms
- Sensitivity: 100dB
- Weight: 328g
As you can see, these are relatively lightweight headphones compared to the average Hifiman devices, which are well known for delivering excellent sound for the price at the cost of above-average weight. As shown in the images, the design is truly unique, with large dark red metallic earcups designed to allow the powerful dynamic drivers inside to breathe, giving a sense of spaciousness that is generally difficult to achieve with closed-back headphones.
We remind beginners that the differences between open-back and closed-back headphones are very important: open-back models tend to offer a more natural and airy sound but are sensitive to external noise, while closed-back models provide better isolation and typically deliver stronger bass response.
At the time of writing, the wired HE-R9 are priced at around €280 without the Bluetooth module, placing them firmly in the entry-level range (especially considering their recent price drop over the past year). Before going deeper into sound performance, we should warn you: these are not headphones for everyone. They are heavily bass-oriented, designed for true “bass lovers.”
The HE-R9 come in Hifiman’s typical packaging with a 3.5mm cable included. The design is so distinctive that you either love it or hate it, but technically it makes sense because it allows a more open and less “congested” soundstage than most closed-back headphones in the same price range.
Hifiman uses its proprietary Topology diaphragm to extend high-frequency response up to 35 kHz, a technology based on nano-material coatings applied to the diaphragm surface, designed to achieve a more natural sound—also used in other higher-end Hifiman headphones.
Comfort is definitely one of the HE-R9’s strengths: the relatively low weight combined with soft ear cushions makes them surprisingly comfortable, allowing long listening sessions without fatigue.
How the HE-R9 sound
Due to their closed-back design and dynamic drivers, the HE-R9 are not easily comparable to other Hifiman headphones (not even the Sundara Closed Back, although that is the closest model). For those familiar with the brand, these headphones are very different from the typical Hifiman sound you might expect (relative to their price range).
We tested them with several DAC/amps, including the Hifiman EF600. What immediately stands out is their strong emphasis on bass: low frequencies dominate the presentation, being extended, quite detailed, and punchy, shaping the overall sound in a “bass-driven” way. This is typical of closed-back headphones in general, but the HE-R9 do not aim for balance: they are designed for those who enjoy strong bass presence.
As a result, they are particularly well suited to bass-heavy genres where powerful low frequencies are desirable:
rock, dub, rap, and electronic music, depending on the artist. Be careful: the HE-R9 are not intended for classical music or delicate singer-songwriter genres.
Hifiman’s engineering is especially noticeable in the soundstage, which—despite being closed—is relatively wide, with proper instrument placement. Another positive aspect is the clean reproduction of high frequencies, without harsh spikes, while the midrange tends to be slightly overshadowed by the bass but remains controlled.
If we had to describe their tonal character, we would call it “dark.” The sound is warm, dense, rich, and full. The dynamics are also quite unique compared to other planar Hifiman headphones, which are typically more precise and analytical; here the presentation is more fluid and organic, yet still musical (albeit with a bass-heavy coloration).
Everything described above refers to wired mode.
Different amplifiers do affect the final result, of course, but the core character of the HE-R9 remains clearly recognizable.
Comparison with Sundara Closed Back: the closed version of the Sundara has dropped significantly in price, sometimes below €170. However, do not assume these models are similar simply because they come from the same brand. In reality, they are very different, as shown in our Closed Back review. In short, the Sundara Closed Back retains a balanced tonal character with only moderate bass emphasis, while the HE-R9 are, as mentioned, strongly bass-focused.
HE-R9 review: conclusions
Some headphone enthusiasts may absolutely love the HE-R9, but be careful: they are not for everyone. You need to know what you are getting. To appreciate them, the listener’s preferences are crucial. These are headphones for bass lovers, for those who listen to rock and other genres where low frequencies are central. In that case, given their current price, the HE-R9 are a very compelling option, delivering powerful bass while maintaining a unique musical character and excellent comfort.
They are not suitable for classical music listeners, nor are they neutral or balanced headphones. They have a very strong personality, and are therefore recommended for those who specifically want bass-emphasized sound in the isolation of a closed-back design.
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