IMR R2 Aten review: Will do everything.


The R2 aten with its dynamic and ceramic driver hybrid sounds very good. The open back design helps a lot with the stage size. Coming from BA based earphone that doesn’t have much heft to the lower end the R1 feels like a bass heavy earphone with most of the nozzle, the best thing is that one can change nozzles as per their preference. I had settled with the red nozzle initially but that too was bassy so I settled with purple/pink nozzle and filter. I don’t know how IMR is doing it but these nozzles do bring a lot of changes to the sound, subtle but perceptible.

The overall sound signature can vary from flat and slightly dry (balanced) to very juicy and warm (L shaped) depending on the filter and nozzle combo. Nevertheless the overall tonality and timber is very neutral and organic irrespective of the nozzle and filters used.

In their words:

“Utilising a high resolution piezo ceramic driver combined with an all new beryllium composite dynamic driver with larger uprated neodymium motors for a huge soundstage and precise instrument placement and with a FR from 10-50000Hz.”

I for a change will break the sound into filters specifically.


With an impedance of 32ohm the R2 Aten is very easy to drive even out of weak sources and the amount of details doesn’t take a hit at all. It is one of those rare IEMs who don’t lose any micro details even when driven out of mobile devices. It can be driven equally efficiently from both Samsung A7 2016 and Shanling M6, it gets very loud with ease. Use any decent source and the R2 is happy to entertain. It takes the native qualities of the source and doesn’t bother much about anything else. If you pair it with less capable sources like Tempotec V1a it still does well. Better sources do bring out more out of it but even if you use top class sources the R2 Aten doesn’t respond accordingly, you just can’t get more and more out of it once you are past the good source mark, it will just inherit the tonality and stage of it, no significant gains in details or clarity.

How much power can I throw at it.. A lot it seems.


One of the biggest USP of the brand IMR is their tuning filters and nozzles. The Filters have “acoustic effects”, in simpler words the filters affect the treble transparency and stage and the nozzles have bass effects. Nozzles come in a handful of colors. (highest bass first) Black, gold, red, pink/purple and green. The filter comes with an additional blue color.  You can always mix match the nozzles with filters. I love the combination of golden filter with pink nozzle, it has the required amount of bass with very good clarity.

In their words the R2 Aten is:

“Fully customisable via the all new interchangeable acoustics nozzles and dampers to give you a multitude of settings for your perfect sound signature. These acoustic nozzles allow you to alter every aspect of the sound from the treble, midrange and bass.”

P.S. I will denote a pair of same color nozzle and filter as a set. (purple and pink are same)

Black and Gold sets:

These sets have least dynamic range and contrast.

The quantity and quality of bass varies a lot with nozzles. The bespoke Aten driver has a lot of grunt and slam when used with black and gold filters. The sub-bass has nearly bass head level of slam and body, it is heavy and wooly, moves good amount of air, more so with the black set. The mid bass has more linear gain with black filter where the golden one feels a bit sudden with rise of energy and body. The overall body is full and meaty, there is good amount of texture and details. The decay speed is on the adequate side with very good precipitation. It really gets in the league of the Shozy pola but the Pola has better details and a bit more sub bass presence. The upper bass is well behaved with all the sets. Coming from precision minded BA based earphones this really feels like a different kind of beast.

The mid range kind of takes the back seat. The transition phase is not exactly great, the energy is lacking and clarity is slightly missing, especially at the lower mid range. The overall signature is less V shaped and more L shaped. Instruments don’t have fantastic clarity or transparency. The body feels to be on the heavier side hence notes don’t have very good agility. The finishing on the notes is blunt and don’t have much bite or attack. Vocals are slightly on the thicker and heavier side, female vocals don’t have the required sharpness and male vocals have excess smoothness. Both Male and female vocals have nice texture and tonality but are not very accurate. Upper mids is not very defined and the micro details are blunt. Notes don’t have above average accuracy or precision.

Treble region doesn’t have much clarity and transparency even when the filters are supposed to have the best energy and clarity (not the gold). The spark and attack is missing. The extension is very good but instruments just have above average transparency and definition, everything above the upper mid range feels a bit veiled and blunt. The notes have thicker body and the air is not up to the mark. The energy and peaks on the graph is felt but thanks to their bluntness they do not make their presence felt.

Stage size of the open back IEM is always going to be bigger than anything else and even when the black and blue filters are supposed to have smaller stage it is considerably bigger than BA based earphones and a bit bigger than the DUNU DK-2001 too. The stage is sadly not very rounded. The bass region has more height than rest of the spectrum. The expansion though feels effortless, the treble region feels a bit less dense and dwells in the lower end for layering and separation. The vocals start at center of the head with expansion slightly out of head. Most of the instruments are placed out of the head with good sonicality and dynamics. The imaging is nice but the resolution is not the best.

If you are a bass lover and don’t like much of the treble bite, these sets are perfect. If you want to change the scene, you can try these nozzles with green and Blue filters which do have better treble clarity.

The best matching is Black nozzle with green filter.

Red set:-

This is more balanced set with better treble clarity. The overall amount of details, sonicality, transparency and clarity is improved. This set is a bit more mature and accurate from every aspect.

The bass is slightly less prominent but is not much behind the black and gold set, the sub-bass is equally rumbly with equally good extension. The difference is at the mid bass decay speed and notes body. Decay is faster and body is slightly less meaty and full, in other words, tighter. They all have similar texture and details but due to the faster decay speed it is less wooly. The mid range is a bit less in the V with slightly better transparency. The micro details have a bit more clarity and notes are less blunt. The transition from upper bass to lower mid is a bit more energetic. Vocals are slightly more accurate and havesimilar tonality and equally good texture. Notes have smaller foot print with a bit better agility. The energy and bite along with attack is more present. The upper mid range is more energetic and slightly shouty. The treble region feels more sparkly and energetic with better transparency. The extension is equally good. Notes are more accurate with better sharpness.

The stage is similarly impressive with marginally better bigger treble stage bringing a bit more roundness. It has better density and air between instruments.

And the problem with the Black and gold filters are kind of patched with the red set.

Pair the red nozzle with blue filter and you have the best balance of everything, nice bass with very good treble energy and clarity.

Pink/Purple set:-

This set improves on the red set with better balance between bass and rest of the spectrum. Recommended set for sure. The lower region is less bloat and the wooliness is gone. The slam is gone, the rumble is not much (more than any BA driver when it comes to size). The decay is faster giving a better sense of accuracy and precision while not giving up on musicality. It has similar texture and notes have more definition. The mid range is balanced with very good transparency and clairty. Notes have nice decay and sharpness. Vocals are more accurate, slightly dry in comparison but the tonality and texture are retained. Female vocals are considerably more accurate compared to the Blue and golden sets. The whole mid range has better resolution and clarity, the micro details have very good transparency. Treble region too has a bit more energy and spark than the red set. The extension is equally good with better instrumental attack and clarity. The mid treble region might feel a bit elevated thanks to sharper notes (which were not much evident with black and golden filters).

The stage is even more rounded with equal height and width and a bit better depth. There is very good amount of air between instruments, layering and separation is improved and now it is better than the Fibae 3. The sonicality is improved with even better cue placement.

The pink set is already there where it is supposed to be, it already is fantastic, even better balance than the red and blue filter combo.

The Avener – castle in the snow feels a lot more alive and agile with this filter, the stage and imaging makes things outstanding.

Green set:-

Oh my my… I was expecting BA type sound and the green filter doesn’t disappoint there but the acoustic seal is not there, there is no pressure created by the drivers, it kind of feels awkward, if you can move past that the green filter literally brings out the most technical side of the R2 aten, it now turns into a precision and accuracy based IEM. With this the notes are drier and have a bit of hollow feel to them. The notes don’t have nice (thin) base but the body and finishing is not as thin.

The most affected part is the bass, it now is in the league of the ER-4 micro, dry, very fast, lean, highly detailed and insanely accurate. The notes vanish into thin air. The extension is there but the notes don’t have rumble or slam to them, the body is negligible but the mid bass hump keeps the lower region alive. Mid range now feels exceptionally clear transparent, the instruments have BA like precision and the huge stage size gives a sense of huge amount of air between instruments. You can close your eyes and can pin point the instruments without even paying attention. Vocals now lose some body but the texture and tonal accuracy is there. The treble now shows its real color, the transparency and clarity is marvelous, even comparable to earphone two three times the price of R2 Aten. It now gets in line with the big boys. The extension is fantastic as the energy and spark is even more evident.

The stage is now reversed, the lower region has least height with treble having a lot of depth and height. The stage now has the highest amount of projection outside the head. The vocals shift from the center of the head to outer side of the head. It gives a totally different perspective.

After the black and gold sets the green set really turns head over heel. It can qualify as the best filter for someone looking for sheer amount of clarity, details and accuracy but for the rest the green nozzle is a waste of effort. It feels awkward, the seal is missing, the imaging is drastically changed and bass can be labeled as missing.

Some owners might find this filter very odd but man, it is something, only if it has a bit more bass without losing the overall transparency and clarity it would have been the go to set.



Suman Sourav Meher

Suman Sourav Meher

My humble audiophile journey started in 2010, when I was in college, where I fell in love with the elements, nuances, and variations of this mesmerizing world. The ability of tiny earphones to recreate amazing sounds made my bad days tolerable and good days better! Now I am a full-time audiophile with a preference for musical tracks, especially vocals and engaging ones. I must admit I am addicted, but not to drugs or alcohol, but to earphones. Come join me as I share my experiences, bad or good, and let’s have some fun!


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