HIFIMAN EF400

The review sample was kindly provided free of charge in exchange for my honest review.
I haven't received monetary or any other kind of compensation and I don't use affiliate links.
The price is $599 and you can order it directly from HiFiMan store.

EF400/Technical highlights

The EF400 is a compact desktop sized DAC/amp that comes as a successor to the legendary EF6 (do you remember it?) that was introduced back in 2012.
Of course the EF6 was a pure headphone amplifier/preamplifier without a DAC section that is now added to the EF400.
The DAC section of the EF400 is based on the "HIMALAYA" R2R DAC module that was first introduced in the HiFiMan Deva Pro wireless headphone.
Two such modules are to be found inside the EF400 in a four channel differential structure with a buffer, an active filter and a balanced, high current, class AB headphone amplifier that can output a massive 10.7 Vrms or 4.4Wpc on a 32Ω load.



Two gain settings are available for better matching with various headphone loads.
The unit is powered by a large, oxygen free copper wounded toroidal transformer with 30000μF of total filter capacitance.
Except for the headphone outputs the EF400 has fixed level, balanced and single ended, line outputs that bypass the amplifier stage.
The active low pass filter can be switched between regular oversampling (OS) or non-oversampling (NOS) modes.



User interface

The EF400 is pretty simple to use, the only thing you have to do is to plug a USB cable into the regular or type-C ports that are located at the back of the unit, power ON and you are ready to go.
The type-C port has priority while there are no other digital inputs, like coaxial and optical, nor analogue, so if you are an old school CD spinner or a vinyl junkie, then you are out of luck as the EF400 will not handle your library.
The unit supports PCM up to 24bit/768kHz and that's it, no DSD nor MQA.
An aluminum rotary knob at the left side of the front face is used to switch between four available filter and gain settings: High Gain NOS, High Gain OS, Low Gain OS and Low Gain NOS.
The right side features the volume knob which is also made from aluminium while there are four different headphone outputs, 6.35mm, 3.5mm, 4.4mm pentacon 4-pin XLR.
The potentiometer has a smooth action, good user feedback and is noise free without any audible scratches.
At the back of the unit, except for the USB inputs, there are also located the ON/OFF switch, the power cord plug and the XLR/RCA line level outputs.
Sampling rate or lock status are not displayed.



Build quality and appearance

The EF400 has a black painted metal chassis with an aluminum faceplate that has a plastic inner part that doesn't look so premium and can be easily scratched.
Build quality and paint job are typically good, the unit feels sturdy and well made but similarly priced devices from other brands, like the YULONG Aurora, are entirely made from aluminium and have more premium feeling and appearance.
Anyway, the EF400 is still beautiful looking and pretty compact so it can fit any desktop or gear rack.



Needs burning time

The EF400 requires an excessive burning time in order to sound as intended.
At first it is a touch harsh, dry, boring and unrefined but it settles down after about 150 hours.
If you are not a believer, then do as you wish but don't say that you haven't been warned.



Associated gear

The digital front end of the audio system consists of the Silent Angel Munich M1T streamer with the external linear power supply and the Bonn N8 Ethernet switch.
Everything is powered through two iFi power stations.
The EF400 was tested with various headphones including the Focal Clear Mg, HiFiMan Arya V3 and Ananda with the Lavricables Ultimate upgrade cable, Sennheiser HD8XX and HD660S among others.

Power output

The EF400 is very powerful and it had no problem driving all the headphones with ease in the low gain setting, not even reaching half of the volume range.
I don't have very difficult to drive headphones, like the HiFiMan Susvara but I am sure that there is plenty of power for driving them.
Despite the amplifier being dead silent, it is not suitable for use with sensitive IEMs due to the excessive power and the increased gain factor of the lowest setting.
Under the low gain setting, sensitive earphones become loud too quickly without much of a usable range to properly adjust the volume.
The amplifier performance is excellent, the matching between it and the DAC is superb, so there is absolutely no need to resort to an external amplifier, unless you want to add some tube flavor or tame the power for sensitive earphones use.

NOS vs OS

The EF400 was extensively tested both in OS and NOS modes, with the former giving considerably better sound performance, at least as far as I am concerned.
NOS mode sounded a little bloomy and unrefined, with less controlled bass and some upper-mids, treble haziness.
The OS mode is superior both in technicalities and overall sound performance so the following impressions apply to this mode alone.



As a standalone DAC

The DAC section of the EF400 retains all the sound qualities and you can happily use the line outputs to an active speaker or an external amplifier and have the same excellent sound performance.

High output impedance

Third party measurements suggest that all headphone outputs are of rather high impedance.
3.5mm SE > 18 ohm
6.4mm SE > 5.7 ohm
4.4 balanced > 10.3 ohm
XLR balanced > 9.85 ohm
This means that the EF400 is not the optimal match with low impedance headphones at least the dynamic driver ones.

Listening impressions

The sound quality is good, very good, almost excellent, with a linear frequency response, great technicalities for the category, and an utterly musical, smooth and engaging character above all that makes the EF400 to shine over the competition.
This is an analogue sounding DAC with the most natural timbre and an organic texture that makes your music sound like real music.
There is a great factor of realism, every single instrument and voices alike are heard with a very convincing tonality and quite close to reality.
The EF400 is expressive and enveloping with a wealth of overtones and colorful harmonics, listening to your music with it is an act of pure pleasure, when you start a session it is almost impossible to stop and the hours keep passing by without even noticing.
Mid-range presentation is deliciously harmonic, listening to classical music is a mind blowing experience, with the right headphones everything sounded extremely close to reality, not only for the timbre alone but also for the concert like scale of the presentation.



The EF400 is inherently dynamic and impactful with a visceral yet controlled, fast and firm bass.
The soundstage is widely expanded with great depth layering, it surrounds the listener in a holographic and large scale manner while positioning is sharp and accurate.
If classical and acoustic music are not your favorites, don't worry because the EF400 has all the technicalities, the bite and the clarity that are needed for all other genres, actually there is nothing that the EF400 can't play with guaranteed success regarding the listeners enjoyment.
It might not be as crystalline, sharp toned or analytical sounding as some other chip based DACs but it is not actually missing much in detail retrieval, transparency and treble fidelity.
What also stands apart in favor of the EF400 are both the tonal coherence and the naturalness of the music flow, with all the individual parts bonded together to form the most integrated and musical sounding whole.
Like when listening to this fine performance of Brahms piano concertos where the EF400 for one more time proved to be a great performer and wholly satisfactory.



Compared to the YULONG DA-ART Aurora ($520)

If you have been reading the Aurora review then you already know that it was rated very highly as one of the most musical sounding D/S DAC/amps of the category.
Before we get into sound comparison, it must be said that the Aurora has better functionality than the EF400.
You get coaxial and optical digital inputs plus an analogue RCA input while the DAC output can be switched between fixed and variable.
Still, no other bells and whistles for the Aurora, like sampling rate display while it misses a gain switch and a 3.5mm headphone plug but on the other hand it decodes both MQA and DSD.
The Aurora is also considerably more compact in size while it has a full aluminium chassis.
Power output is almost the same, the Aurora is a beast on its own with 4W/32Ω and as the EF400, is also not ideally suited for sensitive earphones.



Sound-wise both are excellent sounding, punching well above the category and there is no way to go wrong with any of them.
They do sound very musical and engaging with only some minimal differences.
As is to be expected, the Aurora has the slightest lead in technicalities with increased transparency, more control, punch and firmness on the bass while treble is more resolving, has better bite and a higher textural quality.
On the other hand, the EF400 is more effortless in the music flow, it sounds very analogue and organic with more convincing timbre while the soundstage has better holography and a grander scale.
Two audio devices that are not afraid to sound musical and engaging despite the ongoing better-measurements race and this is why they both get the highest recommendation.

In the end

The HiFiMan EF400 is really unique, it must be the only mid-priced R2R ladder DAC/amp in a D/S overcrowded market where most manufacturers are afraid to experiment with something that is out of the norm.
Functionality and design are not really perfect, there is room for improvement but at the end of day what matters the most is the sound.
And the EF400 is actually very good sounding, musical, coherent and expressive with the most analogue timbre, it will play your music very close to reality with every headphones you throw at it, even the difficult to drive ones.
If you are tired of following the D/S chips war and you are looking for something different and unique that leads to another listening path, then you should definitely try the EF400, you might get very positively surprised.

Test playlist

Copyright - Petros Laskis 2022.

I have been lucky enough to receive a few exciting things recently and one of them is the Hifiman EF400, a DAC/Amp combo, that I will be talking about today.

The EF400 has been sent to me on extended loan by Hifiman for me to test and publish my thoughts and opinions on it, therefore I will be as honest and unbiased as possible (like always). However, as I always mention, it is good to keep in mind that it has not cost me anything to spend time with this unit.



Intro…

My first experience with the Hifiman EF400 was back in May, when I attended the High End Munich show. Hifiman had the EF400, along with it’s bigger brother, the EF1000, in their listening room and I got to spend a bit of time listening to some headphones.

Of course, show conditions are not the best for getting in depth impressions of anything really, they give you a quick taste but, especially in my case, a lot of the time I was listening to music I am not too familiar with, through sources that I do not know, using headphones that I hadn’t tried before. Yes, Hifiman did have a few headphones that I know and love (such as the Ananda, Edition XS, Arya, etc.) but to be honest, I was more interested in trying out things I had not had a chance to try previously (yes, the Susvara was the main candidate!).

Therefore, when Hifiman sent me the EF400 to try with my own music, my own headphones, and in my own home, of course I was extremely happy to do so! Add this to the fact that I also have another very nice amplifier that I am putting through its paces at the moment (the Felkis Audio Echo Mk2, with a review coming soon), which I have been feeding from the R2R DAC of the EF400, I have to say that I have been struggling to actually turn off the music to do other things. It was especially difficult to stop listening and start putting together this review!

Anyway, this review is already going to turn into a long one (as my Hifiman, and my DAC/Amp reviews, usually do), so enough with the chit chat and lets get into the interesting part.



Presentation…

There is nothing exciting about the presentation of the EF400. If you are wanting beautiful packaging, tons of accessories and an incredible unboxing experience, well… I'm afraid you’re going to be a bit let down.

The unit is packaged inside a regular cardboard box, with a black stripe that shows a small image of the product, along with some details and specs.

Inside the box, surrounded by black foam inserts to protect it, we find the unit itself, an IEC cable inside another smaller black box with some QR Codes on it to register the warranty and… well… that's it. As far as I remember you don’t even get a user manual, not that it is needed as the basics are printed on the black stripe of the box.

So, a regular cardboard box which gets sent to the storage room to join many other boxes or random sizes and colours. As I said, nothing exciting but there is no need for anything more.



Build and aesthetics…

The build quality seems to be very good. Completely made of metal, with a lovely metal face plate, I really can’t find anything to complain about. It weighs a fair bit but I can’t see why anyone would want to be moving this around anyway.

As far as aesthetics, we all know they are personal but in my case I really like it. It is a simple no frills look, but at the same time, it is far more interesting than many of the black boxes we see over and over again. The brushed metal look of the face plate, with the dual matching knobs and a black center section, make it look very symmetrical and quite elegant, all in my personal opinion of course.

I can see this being something that will age well and not look out of place due to some trendy look that goes out of fashion.



Functionality…

Ok, so, getting into the more exciting bits, first up is how the EF400 works and how things are laid out.

I already mentioned that there isn’t an instruction manual included but really there isn’t much that isn’t very self explanatory.

On the front of the unit we have two knobs (possibly the most complex part of the unit), with the left one allowing selection of 4x modes. The modes are clearly marked at the side of the knob and they are High Gain NOS, High Gain OS, Low Gain OS and Low Gain NOS. If anyone is wondering what OS and NOS are, they stand for “Oversampling” and “Non Oversampling”, more on that later in the review.

The knob located on the right hand side is even simpler, you turn it clockwise to increase volume and counterclockwise to decrease it. I’m sure that is more than enough of an explanation

In the center of the front panel we have 4x outputs. From left to right these are TRS 6.35mm (unbalanced), 3.5mm (unbalanced), 4.4mm (balanced) and 4pin XLR (balanced). This should meet the needs of almost everyone, especially on a desktop unit.

Moving around to the back of the unit, we have a balanced XLR output, an unbalanced RCA output, a type C USB input, a type B USB input, and IEC power input and the power switch (I’ll complain about that in a moment).

Finally, on the bottom of the unit, there is a sliding switch to choose between 110v an 230v, depending on where you are located.

So, in general, this is a very complete unit and well laid out unit, except for a couple of small things that are maybe more of an issue for me than for other people, but I will mention them anyway.

The first, of course, is the power switch on the back. This is something that I complain about with Schiit products and I am obviously not going to overlook it on this device either. For people who are using this as a desktop all-in-one, it may not be much of an issue, however, as my equipment is mounted in a rack, the switch on the back is a pain. It means that I have to leave enough space to the left of the unit to be able to reach around and access the switch. As my rack is a full 19” wide, it is fortunately not a problem for me to do so, but I would still much rather have the switch accessible from the front.

My other little complaint is the lack of digital inputs. It is nice that they have chosen to include both USB-C and USB-B but only one is usable at a time and I really don’t see the need for both. However, I do miss having an optical and/or a coaxial input. I know my set up is a little more complex than most but I have multiple sources and a small optical network that allows me to feed many things to different set ups, I would really like to be able to join the same optical network with the EF400 but as it only has a single digital input, I am limited to it being fed by only one source, in my case a Pi4 running RopieeeXL.

As far as power is concerned, I can finally say there is no lack here. I say “finally” because I did have a very strange experience with certain USB cables that were causing a noticeable reduction in power. I am not going to go into detail as it was not something that I feel was actually related to the EF400, although I really don’t know what caused the issue. Whatever the case, it is now solved and the EF400 is performing as expected as far as power. That is to say that with a max output of 4.4w, there shouldn’t be many headphones that it can’t push without breaking into a sweat.



My use case…

As with all my DAC and Amp reviews, I like to mention a little about how I use the device as your use may be completely different. This will allow you to get a better grasp on why I like (or dislike) something and what positives (or negatives) may apply to your own scenario.

Usually I will spend time with a device on my desk at work and then move it to home, where I will come up with my final opinions. In the case of the EF400, I did use it for a couple of days in the office but, as I was planning on this being a bit of a longer term review, I moved it to home and installed it into my main system, where I have been using it constantly.

I have been connecting it directly to a laptop on occasions but the majority of the time I have been having it connected to a Pi4, running RopieeeXL, via a powered hub and sending my music via network from any of my other devices (PC, laptop, tablet, phone, etc.).

I have used both the unbalanced and balanced outputs with many headphones and IEMs, and have also been using it’s analog outputs to feed other amplifiers. I have been using it both in OS and NOS mode. I am not going to go into too much detail about technical differences between the two, as there are people with much more expertise out there that can do so, but in short, a NOS DAC takes the digital data and converts it using an analogue filter, whereas an OS DAC uses a digital reconstruction filter to convert to analog, resampling it along the way. As with anything in audio, there are many opinions as to which is best and why, but as the EF400 has both as an option, I will get to my preferences on this particular unit in the sound section.

While touching briefly (with emphasis on “briefly”, as I am not an engineer and don’t pretend to be one), I guess I should mention what is special about this also being an R2R DAC. As a very brief explanation, the difference between an R2R DAC and a Delta Sigma DAC (the most common), is that an R2R DAC uses a ladder of resistors to do the Digital to Analog conversion, whereas DS DACs use a different technology. This is another subject that has many preferences and opinions in the audiophile world, which I am, again, going to skip.

That's enough tech talk for this review, so let's get on to my completely subjective opinions on how this sounds…



Sound…

I am going to start this section of by reminding readers that my opinions on the sound of the EF400 (or any DAC/Amp that I review) are completely subjective and based only on my experiences, not on any kind of scientific measurements or single/double/triple/infinite blind tests.

I feel that expectation biases and personal preferences can play a large role in what sound we hear (or think we hear) from a source, the brain is a very powerful tool (sometimes, other times no so much ). I have read and heard many conversations where R2R and NOS are described as “more musical”, “less detailed”, etc. etc. This means that it is quite possible that these expectations play a part in my opinions on what I hear, no matter how much I try to avoid them doing so. At the end of the day, how I think I hear something is basically the end product for me, whether or not what I hear is actually there or is just being added by my brain.

Anyway, let’s get on with it!

I am not going to get into details on each and every headphone (and IEM) that I have used with the EF400 as this review would go on forever and I am sure it is already going to be one of my usual “too much rambling” entries, but to give you an idea, over the past few weeks I have used the HE1000se, Arya Stealth, Arya v2, Edition XS, Ananda, HE400se, Deva Pro (via cable obviously), HD6XX, DT1990 Pro, Beyer’ Custom Studio and a couple more that I am probably forgetting. As far as IEMs, I have used a bunch but as far as actual detailed listening, I have mostly used the Dunu Vulkan, Letshuoer S12, Moondrop Blessing 2 Dusk and the Yuan Li.

I really can’t say that I have anything negative to say about the pairing of any of the above mentioned headphones/IEMs. I found that each time I connected something new to the EF400, I just enjoyed the result. I didn’t find any lack of dynamics and detail with the Hifiman pairings, but honestly, if a Hifiman amp doesn’t sound good with Hifiman headphones, then they are doing something wrong!

In general, my opinion was that, in comparison to my usual test chains, the EF400 has a more smooth and relaxed sound. This could just be expectation bias on my behalf, my brain telling me that I am hearing what I want to hear, but at the end of the day, as long as I enjoy the outcome, I am not bothered where it comes from (even if it does come from my mind).

When trying out the Ananda, I did get the impression that it wasn’t quite as “in your face” as it is on other combinations, but at the same time, I didn’t notice any lack of details. The HD6XX sounded very alive, and while it is not the best I have heard from the HD6XX, it certainly wasn’t a negative experience.

It is difficult to actually pinpoint what the amp is doing on the EF400 (as there is no analog input) however, after testing the DAC section, which I am coming to next, I feel that the amplification is just a no frills clean sound and that a lot of the smoothness is actually coming from the DAC itself. Again, I can’t do any specific A/B comparisons of the amp vs other amps I know well, but when comparing the EF400 directly vs the EF400 feeding the THX789 (volume matched but still sighted), I didn’t feel that the outcome was hugely different. I did feel that the EF400 was maybe slightly smoother, especially in higher mids/lower treble in the comparison, but that could just be me believing it, I am not sure I would easily differentiate between the EF400 direct and the EF400+789 in a blind test.

So that brings me to the DAC section of the EF400, which I feel is the real star of the unit. I have no idea how this measures, to be honest I am not really bothered either, but I do feel that it has a large impact on the sound when paired with other amplifiers in my chain, in comparison to other DACs that I usually use, such as the SU-8, multiple Toppings, Modi 3+, Gryphon and a couple of mixing consoles.

Now, it is difficult to be able to do an exact A/B comparison with other DACs, due to the EF400 only having USB input (I usually use SPDIF for comparisons as I can run the same signal to all my DACs simultaneously) but I did use a set up that was as close as possible while still being fairly simple. Basically I used two laptops, both playing FLAC files from Foobar, feeding a DAC each and then using an input switcher to switch between DACs.

But enough rambling about non-scientific tests that pretend to try to be scientific and on to my subjective opinion of the EF400 DAC stage… I really like it.

With all the amplifiers I tested it with, there was a sensation of things being smoother and not as harsh, without any loss in detail. I couldn’t really say exactly what was causing the sensation, as there are no differences in FR (yes, I did some measurements to check) but there is just a sensation of things working better together.

My favourite pairings have been with the Asgard 3 and the Feliks Audio Echo Mk2 (I'll go into more detail on this combination in the upcoming Echo review). No matter what I connected to these setups, I found it enjoyable. I said there was no loss in detail and there isn’t, however, I find that it takes the focus away from actually pushing detail at you and makes it all click together a little better. Rather than there being images placed everywhere, there is just one overall image that contains everything in the right places. I feel it is a little like the difference between a recording before and after masterization, the info contained is the same, yet everything is just mounted better.

I know of many that roll their eyes at things like “musicality” to describe the sound of a DAC, and to be honest I do try to avoid similar terms when possible, but sometimes the description just fits.

Finally, before getting to the end of my rambling, I just wanted to mention quickly the OS and NOS options, as I really haven’t commented on them at all and I said I would.

I don’t really have any experience with upsampling etc. as I don’t use HQPlayer and I also don’t have any DACs with this option. I tried the various modes, with various sources, and to be totally blunt, I can’t hear a difference. I mean, I like to think I can, but honestly I really don’t think I am hearing it, just wanting to hear it. If someone was to set the mode without me looking, there is no way I would know which it is, at least not yet, maybe I need to keep listening and also give HQPlayer a try, but that is for another day.



Conclusion…

I have no doubt that the Hifiman EF400 gives you a lot for what it costs, with a great build quality, good performance and a very reasonable price.

Is it the best system I have ever heard? No.

Is there something I have heard for this price that I feel is better? No.

My only complaint would be the lack of a digital input other than USB. I would usually mention the lack of an analog input to use just the amplifier section of the unit but in this case, I feel that the star of the show is the DAC.

I find the DAC to be a great pairing with my system, making everything a little more enjoyable than the more analytical options I have, and if I could add it into my usual optical network, then I think I would use the EF400 for 100% of my listening time. Even with something as “cold and straight to the point” as the THX789, the EF400 gives it a little flavour that is very enjoyable.

As it is, it has now got it’s own dedicated RopieeeXL source, and has become its own little independent system feeding the Echo and Asgard (well, maybe not little ), which I am always looking forwards to connecting to and sitting back with my favourite headphones to just enjoy music.

(As alwyas, this review is also available in Spanish on www.achoreviews.com and on www.youtube.com/achoreviews)

I can’t remember when I first saw the announcement of the EF400, but it was the reason I went out and bought myself a pair of HE6se. Somehow in the back of my mind, I was counting on those two being a good pairing.

Of course, the EF400 kept me waiting a few months, during which I lost my patience and got a Monopiece THX 887 to drive my Arya, HE6se, and numerous other less capable headphones. During this time, I also upgraded my audio interface to an RME UFX II, which had surprisingly powerful and clean headphone outputs, so I started using my Arya directly out of the RME because my THX was largely redundant at that point. The HE6se was collecting dust for a while because I thought it sounded too strident out of the THX amp.

Enter the EF400. I have had this unit for over a month at this point, much of which was spent out of town on an opera performance. During the past few days, I finally had time to give it a proper listen.

In short, I am going to be repeating what everyone else has said- the R2R DAC sounds great and very flattering/forgiving, the amp is plenty powerful, definitely powerful enough to drive my HE6se. For the first time, I am able to say I quite like my HE6se’s. Out of all the Hifiman cans I’ve heard, I have to say they are the brightest of them all, although part of that brightness comes from being under-driven.

VS Monoprice THX 887



I was using the internal R2R DAC of the EF400 for this test, as there is no other choice. It would have been nice if there was a set of analog inputs, but I guess I can’t have everything. The rear XLR outputs were handy when I want to stack my THX amp right on top of the EF400 for a quick A-B comparison.

With the EF400, the main difference is that now there IS bass. I’m not saying the pairing with the THX didn’t have ANY bass, however, switching back and forth between the two amps can reveal how much of the low-end information is missing from the THX.

The other major difference is the warmth and body of the sound. I would say the THX has a slight edge in the definition of the highs as well as the outline of instruments/voices. I listen mostly to classical music, more specifically early music, a genre in which bass instruments form the core of the ensemble, but don’t necessarily take center stage in terms of presence and volume. In this case, more treble definition is not what I need at all, since Hifiman headphones are already very sparkly up top, and I have mostly Hifiman cans. The warmth and extra body from the EF400 are very welcome. To make an analogy, if EF400 sounds like a nice stew of beef and potatoes, THX 887 sounds kind of like the same stew but with the broth dumped out and replaced with distilled water. It is in no way offensive to listen to on its own, but after switching back and forth with an EF400, I find it just not as interesting or pleasant to listen to in general. With the HE6se, it makes more of a “yes” or “no” difference. Now, I am happy to say that I can properly enjoy my HE6se’s and appreciate them as the capable cans they are.

VS RME UFX II



Besides the massive price gap, I use those two devices for very different purposes. The RME is my work unit, I do all of my recording and mixing on this device, and have no doubt I am getting a high quality, faithful sound out of it. The biggest surprise is that the Arya pairs incredibly well with its headphone jack and delivers a very transparent yet 3D and lively sound. The EF400 presents music very differently, in a more laid-back, lush way. For longer listening sessions, it’s definitely less fatigueing. In terms of driving power, while the RME is quite powerful for an audio interface, it doesn’t have nearly as much power as the EF400. I did try plugging in my HE6se just for the heck of it- and surprisingly, I didn’t hate this combination, although they don’t sound nearly as full and “alive” as they do on the EF400. Despite the RME being nearly 3x the price, I find the EF400 holding its own very well.

Who’s it for?

I would say look no further if you have some low-sensitivity planars on your hands, or if you have decided to go the planar way. I guess if you can afford a pair of Susvara’s, you’d have big bucks to spend on a big amp as well. For those of us who don’t want to invest that much in a headphone system, the EF400 offers an incredible value with its very capable built-in dac.

Since I have my RME UFX II+ Arya in my studio, I am using this EF400-HE6se combination in the bedroom, sometimes just before bed. Being a professional musician as well as an audio engineer sometimes means you don’t have a lot of time listening to music for leisure; personally, I haven’t had a proper sit-down with headphones for months before my EF400 arrived. The EF400-HE6se combo is so good that I actually look forward to my late-night listening sessions now. It’s a rare thing for me to just enjoy the music without thinking about microphone placements, mixing, or getting competitive and start analyzing other engineers’ sound. This combo makes me forget about the technicalities and just immerse in the music. A nice treat indeed.

Gear used:

Hifiman Arya

Hifiman HE6se

Beyerdynamic DT990 pro

Beyerdynamic DT770 pro

RME Fireface UFX II

Monoprice THX 887



Reference recordings:

Cavalli: L'amore Innamorato — L'Arpeggiata - Christina Pluhar

Bach: Matthaus-Passion - Pygmalion, Raphael Pichon

Rameau: Les Indes Galantes- Les Arts Florissants, William Christie

Italian Virtuosi Of The Chitarrone, Jakob Lindberg