Link to my review and measurement index thread where one can also find a full review overview, more information about myself as well as my general-ish audio and review manifesto: https://www.head-fi.org/threads/956208/
I only give full stars. My ranking/scoring system does not necessarily follow the norm and is about as follows:
5 stars: The product is very good and received the "highly recommended" award from me.
4 stars: The product is very good and received the "recommended" award from me.
3 stars: The product is good/very good, but not outstanding/special enough to get any of my two awards. ["Thumbs Up"]
2 stars: The product is only about average or even somewhat below that and somewhat flawed/flawed in some areas. [neither "Thumbs Up" nor "Thumbs Down"]
1 star: The product is bad/severely flawed to outright bad. ["Thumbs Down"]
InEar ProPhile 8
Source:
Personal unit.
Miscellaneous:
8 BA drivers per side; four acoustic ways; single-bore design.
They come in a large cardboard box packaging with many included accessories.
Definitely a premium unboxing experience and way improved over InEar’s past unboxing experience I had when I bought their StageDiver SD-2 which didn’t have any proper packaging at all (which, on the other hand, is a good way to reduce waste).
Large, protective and sturdy carrying case with proper rubber and foam padding on the inside - unfortunately it doesn't have any holder for the cleaning tool that is also used to access the two switches on each shell (my UERMs' case is superior in this regard as it does have a holder for the cleaning tool). There's unfortunately no holder for the drying capsule either.
Proper industry standard cable with twisted conductors - supple, light and flexible. 2-pin connectors.
Ergonomically shaped shells with engraved model and serial number. High comfort.
Matte, sand-blasted finish. It's a matter of taste, but I have to say that I like them better in person than on the photos I had seen before I bought the in-ears.
Two switches on the inner side of each shell (the one closer to one's back of the head is the bass switch whereas the other one is the treble switch - definitely easy to remember). Unfortunately they cannot be operated without separate tools (and the shells must also be removed from one's ears).
Sound:
Largest included black silicone tips.
Standard “both switches down” sound signature pretty much all of the time – I never use the bass switches and only activate the treble switches on very rare occasions.
Tonality:
Natural-neutral tuning; very coherent, even and linear. Very close to that of the Ultimate Ears Reference Remastered to-go and therefore also comparable to the UERMs’ sound signature except for the more linear (upper and super) treble tuning the ProPhile 8 have got.
The bass switches add around 3 to 4 extra dB to the lows without spilling into the lower mids/upper fundamental range while adding around 1 additional dB of extra upper treble, whereas the treble switches add around 2 dB of extra boost to the upper treble and around 4 dB to the super treble past 15 kHz; activating both types of switches simultaneously adds the bass boost of the bass switches as well as the treble boost of the treble switches to the sound.
I'd characterise the tuning as natural-neutral, therefore it's closer to my Ultimate Ears Reference Monitors or the Ultimate Ears Reference Remastered to-go in tonality than to my Etymotic ER-4S or the ER4SR which I consider “sterile studio neutral” sounding. So definitely still in the neutral sounding realm, but not as flat-neutral sterile as the Etys when listening to music, noise signals and sine sweeps.
The (compared to diffuse-field flatness) mild bass lift takes place low so it doesn't radiate into the midrange, and its quantity is around 3 dB more than diffuse-field flatness to my ears.
The very low sub-bass is slightly less present than the upper sub-bass and low midbass, but at neutral quantity and not really rolled off.
The mids are just very slightly on the warmer and darker side to my ears but without any real colouration – quite similar to the mids of my UERM, although a touch less present around 2 kHz. The timbre is accurate here.
The presence range and middle treble are on the more relaxed side compared the diffuse-field target and the Etymotic ER-4S as well as ER4SR. Here, the ProPhile 8 are tuned a lot like the UERM; therefore they sound still accurate and don't lack anything, but are bit more relaxed sounding here when performing sine sweeps, listening to music or when directly compared to the Etys.
Going up in the upper treble, the level is at mostly neutral level. In fact, I'd consider the default treble switch "down" position to be just a tad below absolute flatness by 1 dB, whereas it seems to be a tad above absolute flatness in the "up" position, wherefore for ultimate treble perfection to my perception, I would have wished for just one dB more quantity in the default “treble switches down” position.
Cohesion and evenness are very good and the timbre is natural; there are no sudden peaks or dips, which is the main reason for this impression.
Personally, my perception of the ProPhile 8s’ tuning is that they are still clearly in the neutral realm, but are closer closer to the sound of a really good, neutrally tuned hi-fi speaker setup in a properly treated acoustic environment than to a sterile, lifeless set of studio monitors in a properly treated acoustic environment.
Compared to my UERM, my ProPhile 8 have got pretty much exactly 0.5 dB less bass quantity, are less "warm" in the upper fundamental range/lower midrange, are a tad darker in the presence range at 2 kHz (but similar at 3 kHz), and pretty similar in the rest of the treble, but lack the UERMs' >10 kHz peak (that is however only bothering when performing sine sweeps and if a note hits it exactly) wherefore they sound ultimately more linear and realistic, more accurate in the highs and are, as a result, quite similar to the UERR that are however tuned a little darker.
When compared with my ER-4S or the ER4SR, the ProPhile 8 have got a low-end that is pretty much exactly 3 dB stronger in quantity, with mids that are a tad warmer and darker (not really in a coloured way; still very natural) and more relaxed in the presence range as well as middle treble wherefore they sound less “brutally direct” but more “musically neutral”.
In contrast to my InEar StageDiver SD-2, the ProPhile 8 are a good bit less warm and thick sounding, especially in the lower midrange and fundamental range, and a bit less “bassy”, with audibly less midrange warmth and a less relaxed treble response.
Frequency Response:
ER-4S-Compensation
Effect of the Bass Switch
Effect of the Treble Switch
Effect of both Switches
Resolution:
Tight, fast, highly resolving. Excellent midrange resolution and speech intelligibility. Clean note separation. They never start to sound diffuse, even with super dense, fast and complex tracks.
Definitely flagship territory, and even somewhat above my UERM or the NocturnaL Audio Atlantis. In the territory of my Campfire Audio Andromeda but obviously with a very different approach to tonality (the Andromeda are clearly bassier and warmer, with an audibly more relaxed and darker upper midrange/presence range, and the brighter, sharper, more gimmicky treble tuning) and a different bass presentation (tight and fast on the ProPhile 8, visceral and rumbling, with a more lingering decay on the Andromeda).
Not that it really mattered most of the time (unless one is mostly listening to dense and very fast music) anyway, as all of those in-ears are excellent and deliver flagship performance, and even compared (but not directly head-to-head) to my ER-4S or the ER4SR (that I ultimately personally prefer for their superior sterility and flatness, whereas I am using my ProPhile 8 a bit more often because of their higher comfort and less deep insertion (their superior technical performance doesn't matter as much to me most of the times in real-world listening sessions)), the technical superiority of my ProPhile 8 isn't always as important when listening to music for the sake of listening to music and not for the sake of listening to the technical performance of the in-ears, although I tend to prefer them with very fast tracks and densely arranged Classical pieces.
Nonetheless when listening for the sake of determining the in-ears' performance, hands down, the ProPhile 8 beat the comparably tuned UERR as they sounds tighter, faster and better controlled in the lows in comparison, with generally somewhat higher resolution and cleaner note separation. Therefore they also deliver just that bit of extra resolution I sometimes/rarely desired from my UERM when listening to very dense, fast and complex tracks.
Soundstage:
Three-dimensional and especially precise, clean imaging, layering and instrument separation, but not as large, open and expansive sounding as most other in-ears in this price range. For example, the UERM, Andromeda or Atlantis have an audibly larger soundstage in comparison. Somewhat larger than the Etys' soundstage, though (and more precise in comparison).
In terms of size, the ProPhile 8s’ soundstage is really nothing special to my ears and could even be considered to be on the small-ish side (I would have definitely wished for a larger perceived soundstage at this price point), but these in-ears really make up for that with their precise imaging and don’t even struggle with densely arranged and at the same time fast arrangements.
Just like with the resolution, the soundstage remains rock-solid during fast, complex and dense recordings and doesn't start to appear foggy.
- - - - - - - - - - - -
Comparisons:
Ultimate Ears Reference Remastered to-go:
Both are tuned remarkably similar to my ears, featuring a “natural neutral” kind of tuning in contrast to the more “studio neutral”-like sound that the ER4SR and my ER-4S have to my ears.
To my ears, the ProPhile 8 have got pretty much exactly 0.5 dB less bass than the UERR and UERM, are slightly less “warm” in the fundamental range/lower midrange, and sound otherwise pretty similar to the UERR in the treble.
In terms of resolution though, I would position the ProPhile 8 a bit over the UERR. The InEars’ bass is even tighter, faster and better controlled in direct comparison to the UERM, and even a bit more so when compared to the UERR, with the generally somewhat higher resolution and note separation, wherefore they have somewhat of an advantage in very dense, fast and complex music passages.
In terms of soundstage, just as with the resolution, the ProPhile 8 are somewhat above the UERR when it comes to imaging precision and note separation with very densely arranged recordings.
Etymotic ER-4S:
To my ears, the ER-4S represent more of a “sterile studio reference neutral” tuning whereas the ProPhile 8 fall more into the range of being “naturally neutral” tuned.
That said, the ProPhile 8 have around 3 dB more bass than the ER-4S and sound warmer in the fundamental range and lower mids, but are a bit less “warm” than the ER-4XR and have also got slightly less bass.
The ER-4S are slightly more forward/intimate sounding in the mids whereas the ProPhile 8 present the middle frequencies in a comparatively more relaxed way due to the more recessed presence range, but with still accurate timbre and no audible colouration.
Both are very even, realistic and accurate in their treble reproduction, which is something not too many in-ears achieve.
In terms of resolution, precision, bass speed and tightness, the ProPhile 8 are ultimately ahead, which is the most audible during very fast and complex, dense music, but not as strikingly obvious otherwise most of the time. So to say, the ProPhile 8 don’t yet “cave in” when the ER-4S already start to do.
Regarding perceived soundstage, that of the ProPhile 8 isn’t even all that much larger to my ears but only somewhat, but as with the resolution, the In-Ear in-ears are ahead when it comes to imaging precision and remain cleaner, better separated when the track is densely arranged and/or very fast.
Conclusion:
Recommended.
Natural-neutral sound signature with highly convincing technicalities, a realistic timbre, linear treble, fast and tight, controlled bass and precise imaging. The pure soundstage size is not really overwhelmingly large, though, and could be even seen as being on the smaller side.
I only give full stars. My ranking/scoring system does not necessarily follow the norm and is about as follows:
5 stars: The product is very good and received the "highly recommended" award from me.
4 stars: The product is very good and received the "recommended" award from me.
3 stars: The product is good/very good, but not outstanding/special enough to get any of my two awards. ["Thumbs Up"]
2 stars: The product is only about average or even somewhat below that and somewhat flawed/flawed in some areas. [neither "Thumbs Up" nor "Thumbs Down"]
1 star: The product is bad/severely flawed to outright bad. ["Thumbs Down"]
InEar ProPhile 8
Source:
Personal unit.
Miscellaneous:
8 BA drivers per side; four acoustic ways; single-bore design.
They come in a large cardboard box packaging with many included accessories.
Definitely a premium unboxing experience and way improved over InEar’s past unboxing experience I had when I bought their StageDiver SD-2 which didn’t have any proper packaging at all (which, on the other hand, is a good way to reduce waste).
Large, protective and sturdy carrying case with proper rubber and foam padding on the inside - unfortunately it doesn't have any holder for the cleaning tool that is also used to access the two switches on each shell (my UERMs' case is superior in this regard as it does have a holder for the cleaning tool). There's unfortunately no holder for the drying capsule either.
Proper industry standard cable with twisted conductors - supple, light and flexible. 2-pin connectors.
Ergonomically shaped shells with engraved model and serial number. High comfort.
Matte, sand-blasted finish. It's a matter of taste, but I have to say that I like them better in person than on the photos I had seen before I bought the in-ears.
Two switches on the inner side of each shell (the one closer to one's back of the head is the bass switch whereas the other one is the treble switch - definitely easy to remember). Unfortunately they cannot be operated without separate tools (and the shells must also be removed from one's ears).

Sound:
Largest included black silicone tips.
Standard “both switches down” sound signature pretty much all of the time – I never use the bass switches and only activate the treble switches on very rare occasions.
Tonality:
Natural-neutral tuning; very coherent, even and linear. Very close to that of the Ultimate Ears Reference Remastered to-go and therefore also comparable to the UERMs’ sound signature except for the more linear (upper and super) treble tuning the ProPhile 8 have got.
The bass switches add around 3 to 4 extra dB to the lows without spilling into the lower mids/upper fundamental range while adding around 1 additional dB of extra upper treble, whereas the treble switches add around 2 dB of extra boost to the upper treble and around 4 dB to the super treble past 15 kHz; activating both types of switches simultaneously adds the bass boost of the bass switches as well as the treble boost of the treble switches to the sound.
I'd characterise the tuning as natural-neutral, therefore it's closer to my Ultimate Ears Reference Monitors or the Ultimate Ears Reference Remastered to-go in tonality than to my Etymotic ER-4S or the ER4SR which I consider “sterile studio neutral” sounding. So definitely still in the neutral sounding realm, but not as flat-neutral sterile as the Etys when listening to music, noise signals and sine sweeps.
The (compared to diffuse-field flatness) mild bass lift takes place low so it doesn't radiate into the midrange, and its quantity is around 3 dB more than diffuse-field flatness to my ears.
The very low sub-bass is slightly less present than the upper sub-bass and low midbass, but at neutral quantity and not really rolled off.
The mids are just very slightly on the warmer and darker side to my ears but without any real colouration – quite similar to the mids of my UERM, although a touch less present around 2 kHz. The timbre is accurate here.
The presence range and middle treble are on the more relaxed side compared the diffuse-field target and the Etymotic ER-4S as well as ER4SR. Here, the ProPhile 8 are tuned a lot like the UERM; therefore they sound still accurate and don't lack anything, but are bit more relaxed sounding here when performing sine sweeps, listening to music or when directly compared to the Etys.
Going up in the upper treble, the level is at mostly neutral level. In fact, I'd consider the default treble switch "down" position to be just a tad below absolute flatness by 1 dB, whereas it seems to be a tad above absolute flatness in the "up" position, wherefore for ultimate treble perfection to my perception, I would have wished for just one dB more quantity in the default “treble switches down” position.
Cohesion and evenness are very good and the timbre is natural; there are no sudden peaks or dips, which is the main reason for this impression.
Personally, my perception of the ProPhile 8s’ tuning is that they are still clearly in the neutral realm, but are closer closer to the sound of a really good, neutrally tuned hi-fi speaker setup in a properly treated acoustic environment than to a sterile, lifeless set of studio monitors in a properly treated acoustic environment.
Compared to my UERM, my ProPhile 8 have got pretty much exactly 0.5 dB less bass quantity, are less "warm" in the upper fundamental range/lower midrange, are a tad darker in the presence range at 2 kHz (but similar at 3 kHz), and pretty similar in the rest of the treble, but lack the UERMs' >10 kHz peak (that is however only bothering when performing sine sweeps and if a note hits it exactly) wherefore they sound ultimately more linear and realistic, more accurate in the highs and are, as a result, quite similar to the UERR that are however tuned a little darker.
When compared with my ER-4S or the ER4SR, the ProPhile 8 have got a low-end that is pretty much exactly 3 dB stronger in quantity, with mids that are a tad warmer and darker (not really in a coloured way; still very natural) and more relaxed in the presence range as well as middle treble wherefore they sound less “brutally direct” but more “musically neutral”.
In contrast to my InEar StageDiver SD-2, the ProPhile 8 are a good bit less warm and thick sounding, especially in the lower midrange and fundamental range, and a bit less “bassy”, with audibly less midrange warmth and a less relaxed treble response.
Frequency Response:

ER-4S-Compensation

Effect of the Bass Switch

Effect of the Treble Switch

Effect of both Switches
Resolution:
Tight, fast, highly resolving. Excellent midrange resolution and speech intelligibility. Clean note separation. They never start to sound diffuse, even with super dense, fast and complex tracks.
Definitely flagship territory, and even somewhat above my UERM or the NocturnaL Audio Atlantis. In the territory of my Campfire Audio Andromeda but obviously with a very different approach to tonality (the Andromeda are clearly bassier and warmer, with an audibly more relaxed and darker upper midrange/presence range, and the brighter, sharper, more gimmicky treble tuning) and a different bass presentation (tight and fast on the ProPhile 8, visceral and rumbling, with a more lingering decay on the Andromeda).
Not that it really mattered most of the time (unless one is mostly listening to dense and very fast music) anyway, as all of those in-ears are excellent and deliver flagship performance, and even compared (but not directly head-to-head) to my ER-4S or the ER4SR (that I ultimately personally prefer for their superior sterility and flatness, whereas I am using my ProPhile 8 a bit more often because of their higher comfort and less deep insertion (their superior technical performance doesn't matter as much to me most of the times in real-world listening sessions)), the technical superiority of my ProPhile 8 isn't always as important when listening to music for the sake of listening to music and not for the sake of listening to the technical performance of the in-ears, although I tend to prefer them with very fast tracks and densely arranged Classical pieces.
Nonetheless when listening for the sake of determining the in-ears' performance, hands down, the ProPhile 8 beat the comparably tuned UERR as they sounds tighter, faster and better controlled in the lows in comparison, with generally somewhat higher resolution and cleaner note separation. Therefore they also deliver just that bit of extra resolution I sometimes/rarely desired from my UERM when listening to very dense, fast and complex tracks.
Soundstage:
Three-dimensional and especially precise, clean imaging, layering and instrument separation, but not as large, open and expansive sounding as most other in-ears in this price range. For example, the UERM, Andromeda or Atlantis have an audibly larger soundstage in comparison. Somewhat larger than the Etys' soundstage, though (and more precise in comparison).
In terms of size, the ProPhile 8s’ soundstage is really nothing special to my ears and could even be considered to be on the small-ish side (I would have definitely wished for a larger perceived soundstage at this price point), but these in-ears really make up for that with their precise imaging and don’t even struggle with densely arranged and at the same time fast arrangements.
Just like with the resolution, the soundstage remains rock-solid during fast, complex and dense recordings and doesn't start to appear foggy.
- - - - - - - - - - - -
Comparisons:
Ultimate Ears Reference Remastered to-go:
Both are tuned remarkably similar to my ears, featuring a “natural neutral” kind of tuning in contrast to the more “studio neutral”-like sound that the ER4SR and my ER-4S have to my ears.
To my ears, the ProPhile 8 have got pretty much exactly 0.5 dB less bass than the UERR and UERM, are slightly less “warm” in the fundamental range/lower midrange, and sound otherwise pretty similar to the UERR in the treble.
In terms of resolution though, I would position the ProPhile 8 a bit over the UERR. The InEars’ bass is even tighter, faster and better controlled in direct comparison to the UERM, and even a bit more so when compared to the UERR, with the generally somewhat higher resolution and note separation, wherefore they have somewhat of an advantage in very dense, fast and complex music passages.
In terms of soundstage, just as with the resolution, the ProPhile 8 are somewhat above the UERR when it comes to imaging precision and note separation with very densely arranged recordings.
Etymotic ER-4S:
To my ears, the ER-4S represent more of a “sterile studio reference neutral” tuning whereas the ProPhile 8 fall more into the range of being “naturally neutral” tuned.
That said, the ProPhile 8 have around 3 dB more bass than the ER-4S and sound warmer in the fundamental range and lower mids, but are a bit less “warm” than the ER-4XR and have also got slightly less bass.
The ER-4S are slightly more forward/intimate sounding in the mids whereas the ProPhile 8 present the middle frequencies in a comparatively more relaxed way due to the more recessed presence range, but with still accurate timbre and no audible colouration.
Both are very even, realistic and accurate in their treble reproduction, which is something not too many in-ears achieve.
In terms of resolution, precision, bass speed and tightness, the ProPhile 8 are ultimately ahead, which is the most audible during very fast and complex, dense music, but not as strikingly obvious otherwise most of the time. So to say, the ProPhile 8 don’t yet “cave in” when the ER-4S already start to do.
Regarding perceived soundstage, that of the ProPhile 8 isn’t even all that much larger to my ears but only somewhat, but as with the resolution, the In-Ear in-ears are ahead when it comes to imaging precision and remain cleaner, better separated when the track is densely arranged and/or very fast.

Conclusion:
Recommended.
Natural-neutral sound signature with highly convincing technicalities, a realistic timbre, linear treble, fast and tight, controlled bass and precise imaging. The pure soundstage size is not really overwhelmingly large, though, and could be even seen as being on the smaller side.