Hello everyone, this is my first review here so please enjoy responsibly (LOL) . 
A note on audio formats: I listen to all kinds of modern, all-digital recordings in order to get pure, natural sound.
I don't listen to high resolution audio because it's no better than 44/16 (you can find a good explanation of the high res audio misconception on XIPH.ORG, highly recommended). I also don't listen to analog audio because I find it to sound unnatural, distorted and lacking, especially in the top end. To me, ''analog warmth'' simply sounds distorted, colored, and definitely not clean.
So, as you probably expected, all music that I used in this review is either FLAC (44/16), MP3 w/ 320 kbps or iTunes Plus (AAC w/ 256k), either from Filesh*ring or from original CD's.
Sources: iPhone 6 Plus, iPhone 4, iPod touch 2G, iPad 2, 'MPIO' mp3 player from the fleamarket, gaming pc soundcard.
Music used:
Lossless: Avicii- Sunshine, Wake Me Up, Hey Brother, Broken Arrows, City Lights, The Nights. Hardwell- Follow Me, United We Are, Dont stop the madness, here is here now, young again. Parra For Cuva - Wicked Games, Fifth Harmony - Worth It, Jack Johnson - The horizon has been defeated, Upside Down, Banana Pancakes, Inaudible Melodies, Enemy, Supposed to be. Zedd Clarity (album), The Script ''Hall Of Fame Original'', Fred V & Grafix Recognise LP (album)
Lossy. Dannic- Viper, Mayday, Forever, Dear Life (all 320). Avicii- The Nights (see below), Bondax & Friends The Mix Album (iTunes), Lana Del Rey Honeymoon (320)
Comfort- 8/10
I think the ER4P are very comfortable as long as you use tri-flange tips. The foam tips are terrible though. I also tried the mushroom tips, but besides looking cool, they only make the sound worse and easily pop out of the ears. I also tried comply's and did not like them at all, too squishy and terrible isolation. I gave the complys to my 9y/o cousin, who gave them to his 2y/o sister because he didn't like them either. She likes them however.
As to sports, they are OK under a motorbike helmet but I do not use them, and don't recommend using them for this purpose because they isolate so much. This can be very dangerous when riding a bike. The same goes for skiing. Something less isolating would be better under these circumstances.
Looks - 9/10
Looks are great with the ER4P in my opinion. Look-wise, they are the in-ear counterpart to the HD25, which I also have. Both look very subdued, professional and classy. They go well with every type of outfit you may be wearing- be it an expensive suit, motorbike clothing, colourful summer things, a skiing outfit, whatever. Still, more colorful earphones like the bose soundsports (review coming soon) look better in the winter.
Durability - 2/10
Durability is terrible with these. In the two years of owning them, I already have my THIRD (!) pair. On the first pair, the armature of one earphone had broken and it was rattling like crazy. This pair was already almost broken at the joints, but was replaced without problems. The second pair broke at the joints to the earphones. Fortunately, these were also replaced under warranty, albeit with some quirks. Also, the thick cable below the split is terrible. I got the most recent pair two months ago and the cable below the split is already so twisty it's unbearable. FYI, I mostly keep the earphones either in a small candy box, on my desk or simply in my pocket.
Cable - 1/10
As I wrote before, the cable is terrible. Apparently, the old version with colored split and earphone joints was much more durable (and looked much cooler too), but they don't make it anymore, which is a PITA. The plug is also quite small compared to other decent IEM's. Also, the cable is EXTREMELY stiff in cold weather.
Now for the best part, SOUND!
Sound is very good with these earphones. The presentation is very natural and realistic. Soundstage is definitely there but not very big. If you are looking for a huge soundstage I recommend trying the Beyerdynamic DT-150. Despite having an impedance of 250 Ohm, they do not need an amp at all and get very loud straight from the iPhone.
Back to the Etymotic:
Bass. It is definitely there but does not jump out at you like in some other 'phones. It is more like a natural part of the sound and blends in very nicely. The bass reaches quite deep, not as deep as the Philips SHE3590 but definitely until 35Hz. The bass is very flat, there is no mid bass bump like in most cheap earphones or deep bass emphasis like in the 3590.
The mids. The mids are extremely neutral and realistic with unbelievable resolution and texture. Zedd's crazy synths sound very grippy, defined and textured. The same goes for dubstep. The wobbles are very defined. The timbre is very natural too, which becomes evident when listening to Jack Johnson or Lana Del Rey. JJ sounds like he's right in front of you and you can hear every single guitar string being struck. The overtones and small details of JJ's voice are also very realistic and defined. Lana del Rey's voice stands right in the center of the room and sounds very realistic. Ellie Goulding's voice is also very nice to listen to, because you can hear all of the overtones like in reality.
Then there is the treble. According to the measurements from Etymotic, the treble is slightly rolled off in the ER-4P. However, since the treble is boosted like crazy in most modern recordings, the ER-4P still sound too bright IMO. In a lot of club tracks, for example, the treble is boosted so much it hurts. The solution is to either attenuate the treble in the sound files using a sound editor like audition, or simply attenuate it on playback using a digital equalizer.
The extension. The treble extends very far in the ER4P, up to about 17 or 18 kHz. Considering anything above ~19kHz is inaudible to most people over 10 years and most of the important information in music is below 17kHz, this is pretty decent.
Overall the etymotic ER-4P sounds very smooth, but since it is essentially flat, lacks some body in the sound. The speed of sound is impressive and puts even the HD800 to shame. However, since the treble is only rolled off ever so slightly, it sounds too bright on most modern recordings.
Now some impressions with certain CD's.
Everything Jack Johnson: Very natural sounding and excellent timbre. The next best thing to listening to JJ sing live in front of you, in an acoustically treated room, without any amplifier.
Zedd very grippy and textured, full of details, but too much treble. On ''Push Play'' from 'Clarity', the overtones of the synths are very defined. The acid-like synths sound very textured. Despite the track being mixed to achieve extreme loudness, the ER4P still keeps it tidy and does not allow anything to become muddy. 'True Colors' is not as spectacular, but still nice.
Hardwell like Zedd, very textured and full of overtones, but excessive treble boost.
Avicii ''True'' is not as treble-heavy as Zedd or Hardwell but still has an emphasis on the treble. Details are not as pronounced, the overall quality of the CD is humble. Sometimes you can hear pumping from the compression. ''Hey Brother'' sounds unnatural at times. Still, the ER4P keeps it tidy and shows all the faults of the recording. In Avicii's The Nights,
The ER4P immediately shows the ugly truth that ''The Nights'' in Lossless formats (I have tried copies from lots of different online music vendors) is actually sourced from a lossy MP3 file. This is shocking
since it's an official release and a Top 10 hit. Spectrogram (from official lossless file): http://i58.tinypic.com/295a4ub.png
'Stories' is more like Zedd with a heavy emphasis on the treble but better overall mix.
The Script ''#3''. Much more spacious sounding than other CDs tested. Nice emphasis on the bass, warm overall sound. Treble is just a tad too much.
Avicii ''Sunshine'' (sometimes labelled David Guetta). Very lush sounding track, very defined but overpowering treble. The layered synths in this track are sound very open and spacious on the ER4P.
Parra For Cuva & Anna Naklab ''Wicked Games'' lush sounding track, nice bass kick on the ER4P.
Fred V & Grafix Recognise LP: This album nicely shows the incredible speed and tightness of the ER4P. Transients are very clean but the treble is too much. The soundstage is medium here but the ER4P keeps everything tidy and the whole album sounds ''just right'' from start to finish, except
Bondax & Friends The Mix Album This is one of the few modern albums without the crazy treble emphasis. The treble is still emphasised but not to a big extent. Some tracks do have crazy treble emphasis however. Overall, the album sounds spacious, lush, natural and some tracks even sound full through the ER4P. Also, the sometimes very deep bass of this album truly comes to life through the ER4P.
OK, that's it for this review. Thanks for reading and I hope you enjoyed it. If you have any questions, critics, suggestions, please don't hestitate to post a comment!
~Soap
A note on audio formats: I listen to all kinds of modern, all-digital recordings in order to get pure, natural sound.
I don't listen to high resolution audio because it's no better than 44/16 (you can find a good explanation of the high res audio misconception on XIPH.ORG, highly recommended). I also don't listen to analog audio because I find it to sound unnatural, distorted and lacking, especially in the top end. To me, ''analog warmth'' simply sounds distorted, colored, and definitely not clean.
So, as you probably expected, all music that I used in this review is either FLAC (44/16), MP3 w/ 320 kbps or iTunes Plus (AAC w/ 256k), either from Filesh*ring or from original CD's.
Sources: iPhone 6 Plus, iPhone 4, iPod touch 2G, iPad 2, 'MPIO' mp3 player from the fleamarket, gaming pc soundcard.
Music used:
Lossless: Avicii- Sunshine, Wake Me Up, Hey Brother, Broken Arrows, City Lights, The Nights. Hardwell- Follow Me, United We Are, Dont stop the madness, here is here now, young again. Parra For Cuva - Wicked Games, Fifth Harmony - Worth It, Jack Johnson - The horizon has been defeated, Upside Down, Banana Pancakes, Inaudible Melodies, Enemy, Supposed to be. Zedd Clarity (album), The Script ''Hall Of Fame Original'', Fred V & Grafix Recognise LP (album)
Lossy. Dannic- Viper, Mayday, Forever, Dear Life (all 320). Avicii- The Nights (see below), Bondax & Friends The Mix Album (iTunes), Lana Del Rey Honeymoon (320)
Comfort- 8/10
I think the ER4P are very comfortable as long as you use tri-flange tips. The foam tips are terrible though. I also tried the mushroom tips, but besides looking cool, they only make the sound worse and easily pop out of the ears. I also tried comply's and did not like them at all, too squishy and terrible isolation. I gave the complys to my 9y/o cousin, who gave them to his 2y/o sister because he didn't like them either. She likes them however.
As to sports, they are OK under a motorbike helmet but I do not use them, and don't recommend using them for this purpose because they isolate so much. This can be very dangerous when riding a bike. The same goes for skiing. Something less isolating would be better under these circumstances.
Looks - 9/10
Looks are great with the ER4P in my opinion. Look-wise, they are the in-ear counterpart to the HD25, which I also have. Both look very subdued, professional and classy. They go well with every type of outfit you may be wearing- be it an expensive suit, motorbike clothing, colourful summer things, a skiing outfit, whatever. Still, more colorful earphones like the bose soundsports (review coming soon) look better in the winter.
Durability - 2/10
Durability is terrible with these. In the two years of owning them, I already have my THIRD (!) pair. On the first pair, the armature of one earphone had broken and it was rattling like crazy. This pair was already almost broken at the joints, but was replaced without problems. The second pair broke at the joints to the earphones. Fortunately, these were also replaced under warranty, albeit with some quirks. Also, the thick cable below the split is terrible. I got the most recent pair two months ago and the cable below the split is already so twisty it's unbearable. FYI, I mostly keep the earphones either in a small candy box, on my desk or simply in my pocket.
Cable - 1/10
As I wrote before, the cable is terrible. Apparently, the old version with colored split and earphone joints was much more durable (and looked much cooler too), but they don't make it anymore, which is a PITA. The plug is also quite small compared to other decent IEM's. Also, the cable is EXTREMELY stiff in cold weather.
Now for the best part, SOUND!
Sound is very good with these earphones. The presentation is very natural and realistic. Soundstage is definitely there but not very big. If you are looking for a huge soundstage I recommend trying the Beyerdynamic DT-150. Despite having an impedance of 250 Ohm, they do not need an amp at all and get very loud straight from the iPhone.
Back to the Etymotic:
Bass. It is definitely there but does not jump out at you like in some other 'phones. It is more like a natural part of the sound and blends in very nicely. The bass reaches quite deep, not as deep as the Philips SHE3590 but definitely until 35Hz. The bass is very flat, there is no mid bass bump like in most cheap earphones or deep bass emphasis like in the 3590.
The mids. The mids are extremely neutral and realistic with unbelievable resolution and texture. Zedd's crazy synths sound very grippy, defined and textured. The same goes for dubstep. The wobbles are very defined. The timbre is very natural too, which becomes evident when listening to Jack Johnson or Lana Del Rey. JJ sounds like he's right in front of you and you can hear every single guitar string being struck. The overtones and small details of JJ's voice are also very realistic and defined. Lana del Rey's voice stands right in the center of the room and sounds very realistic. Ellie Goulding's voice is also very nice to listen to, because you can hear all of the overtones like in reality.
Then there is the treble. According to the measurements from Etymotic, the treble is slightly rolled off in the ER-4P. However, since the treble is boosted like crazy in most modern recordings, the ER-4P still sound too bright IMO. In a lot of club tracks, for example, the treble is boosted so much it hurts. The solution is to either attenuate the treble in the sound files using a sound editor like audition, or simply attenuate it on playback using a digital equalizer.
The extension. The treble extends very far in the ER4P, up to about 17 or 18 kHz. Considering anything above ~19kHz is inaudible to most people over 10 years and most of the important information in music is below 17kHz, this is pretty decent.
Overall the etymotic ER-4P sounds very smooth, but since it is essentially flat, lacks some body in the sound. The speed of sound is impressive and puts even the HD800 to shame. However, since the treble is only rolled off ever so slightly, it sounds too bright on most modern recordings.
Now some impressions with certain CD's.
Everything Jack Johnson: Very natural sounding and excellent timbre. The next best thing to listening to JJ sing live in front of you, in an acoustically treated room, without any amplifier.
Zedd very grippy and textured, full of details, but too much treble. On ''Push Play'' from 'Clarity', the overtones of the synths are very defined. The acid-like synths sound very textured. Despite the track being mixed to achieve extreme loudness, the ER4P still keeps it tidy and does not allow anything to become muddy. 'True Colors' is not as spectacular, but still nice.
Hardwell like Zedd, very textured and full of overtones, but excessive treble boost.
Avicii ''True'' is not as treble-heavy as Zedd or Hardwell but still has an emphasis on the treble. Details are not as pronounced, the overall quality of the CD is humble. Sometimes you can hear pumping from the compression. ''Hey Brother'' sounds unnatural at times. Still, the ER4P keeps it tidy and shows all the faults of the recording. In Avicii's The Nights,
The ER4P immediately shows the ugly truth that ''The Nights'' in Lossless formats (I have tried copies from lots of different online music vendors) is actually sourced from a lossy MP3 file. This is shocking
'Stories' is more like Zedd with a heavy emphasis on the treble but better overall mix.
The Script ''#3''. Much more spacious sounding than other CDs tested. Nice emphasis on the bass, warm overall sound. Treble is just a tad too much.
Avicii ''Sunshine'' (sometimes labelled David Guetta). Very lush sounding track, very defined but overpowering treble. The layered synths in this track are sound very open and spacious on the ER4P.
Parra For Cuva & Anna Naklab ''Wicked Games'' lush sounding track, nice bass kick on the ER4P.
Fred V & Grafix Recognise LP: This album nicely shows the incredible speed and tightness of the ER4P. Transients are very clean but the treble is too much. The soundstage is medium here but the ER4P keeps everything tidy and the whole album sounds ''just right'' from start to finish, except
Bondax & Friends The Mix Album This is one of the few modern albums without the crazy treble emphasis. The treble is still emphasised but not to a big extent. Some tracks do have crazy treble emphasis however. Overall, the album sounds spacious, lush, natural and some tracks even sound full through the ER4P. Also, the sometimes very deep bass of this album truly comes to life through the ER4P.
OK, that's it for this review. Thanks for reading and I hope you enjoyed it. If you have any questions, critics, suggestions, please don't hestitate to post a comment!
~Soap
