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Their strengths are the naturalness and realism of the sound, along with the incredible freedom and purity of the sound. The main issue I have with the Deva’s detail retrieval has to do with some slight grain in the treble, and perhaps a less clear midrange due to some unevenness around 800-1khz. Perhaps this makes things sharper and clearer -- but it really lacks any soundstage, and that's one of Hifiman's signature things. Once again, Hifiman uses its Ultra-Thin Diaphragm inside for the lowest distortion, fast response, and high level of detail. Yes, this is typical planar bass, excelling at cleanliness and speed, and I do miss some dynamic driver warmth to be totally honest, but within planar presentation of bass, the Deva Pro really does hold its own and I do not feel that it is overshadowed in the Hifiman lineup until we start reaching models that stretch into the 4 figure sums.
It’s the 3rd headphone to receive the stealth magnet array after the HE-1000SE’s original inheritance from the Susvara. In addition to its wireless connectivity, the Bluetooth dongle can be used as a powerful integrated DAC/amp for smartphones and other low-power devices, simply by connecting a USB-C cable. This means that it’s not quite as revealing of the resonant harmonics for certain instrument tones and a bit more forgiving for worse recordings. As for bass levels, slam and punch themselves, these are not designed to batter your head or hit you with a hammer while you get up and yell for more, the bass is tuned towards a more neutral or reference approach and it fits like glove given the newly added technicalities.Their quality and functionality appealed to me a lot and guaranteed that I would not give up their freedom and purity of sound for a long time. This means that vocals are not quite as forward as on other models and added to the slight reduction in the low mids, and that peak at 5kHz, can mean that they lose a little of their richness, along with a bit of an extra sizzle that can be a little piercing depending on the track in question.
The Deva Pro as a bluetooth headphone, it is good, but when it is being used as a wired headphone, the performance is even better as it is scaling with your amp and dac setup. And so maybe the ‘open character’ is simply correlated with the additional benefits that are gained from the fact that it’s an open-back headphone. Meanwhile, the neo-supernano diaphragm refers to the nano-scale thinness of the diaphragm itself, with a sub-micron level voice coil traced onto the diaphragm. The solitary button can be used to power on or off via long-press, whereas a short-press disconnects the Deva Pro from the current device. Starting off with the subbass, the roll off is more pronounced than on other sets of Hifiman planars.One thing I did notice is that the voice that informs you that you are powered on and/or connected is at the same volume independent of your source volume or previous listening levels. It's impressive how Fiio has considered the upgrade path for E7 DAC owners by integrating an iPod-style dock connector into the E9. Everything, from slight touches of the strings, to them vibrating and resonating in a quite funky and pleasant way is presented to you without even the slightest sign of hesitation. A general note: measurements from the GRAS 43AG will be available for future reviews, but as of writing this it's still in the setup stages and hasn't been configured.
What’s worth noting is that the Deva Pro has a shinier and more pronounced treble, which could be a hit or miss for some people. Initially, I planned to devote a separate article to it, but since it is dedicated to deva pro by default, but not only. A further step to reach low acoustic impedance based on the original Window Shade system, now enhanced with stealth magnets.The soundstage is impressive, with this open-back headphones you get an airy, resolute and detailed experience. The primary downside to the Mobius is that when you turn off its ‘3D’ simulation effect (something I prefer not to use), the headphone has a much more narrow and intimate soundstage, meaning that the Deva definitely wins there. I know there were lots of people who weren’t overly fond of the original colour scheme so I think that the more classical black and silver look will please them. These are incredibly comfortable, slightly darker, but very natural headphones with a beautiful and dynamic presentation.
As we get into the mids, the transition from the bass area is excellent, with not a hint of anything becoming stressed or muddy. The bass is more rumbly than punchy, the sub-bass extension has a far reach and goes quite deep but it does not envelope you in bass. During USB, Bluetooth and analog wired mode charging is happening at the same time if you wish so – very convenient.Thanks to the addition of the Stealth Magnets and the fact, that the Bluemini is now so much better than the original one, the Deva Pro is simply a no-brainer if you’re looking for quality, open-back headphones that can be both wireless and wired. I have compared the Deva Pro quite a bit to the HE400se in this review, at least in regards to sound. LDAC is smooth and doesn’t seem to have any issues staying connected, allowing me to freely roam my office while my phone is on my desk. The cable included is…it’s a basic, black Hifiman cable, there’s nothing more to say about it, to be honest.
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