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post #271 of 418
Quote:
Originally Posted by vlenbo View Post
 

once I get my ck10s back, I'll be able to compare and review the im-02s.

 

For now, have a nice read on the comparison between the ck100pro and the im-02s from the hardware forums.

 

http://forums.hardwarezone.com.sg/headphones-earphones-portable-media-devices-314/audio-technica-appreciation-thread-4032318-51.html

 

read the quoted post.

 

There is a comment that the im-03s are the successor of the ck100pros.

They are basically the same thing, but a bit improved and refined.

 

im-04 is entirely different from At's original ba lineup.

 

If you meant a comparison between the im-50s and im-70s, then I wish I could tell you, but maybe this forum might have information you are looking for.

 

 

 

 

 

 

 

 

Just cross-posting the short review I wrote for the ATH-IM02's from one of my local forums HardwareZone, over here since I see there have been some active discussions about the current IM balanced armature series in terms of Audio-technica's latest wave of releases. My pair of ATH-IM02's has been burnt in for at least 80 hours prior before I wrote the following review, as I got these sometime last year shortly after Christmas Day but since I'm more of a lurker and infrequent Head-fi poster, thus I was quite late in contributing my own impressions/findings about them.

 

I will not be A/Bing them against the CK100 as both models bear quite abit of different signature/SQ traits to them, but I personally do consider the ATH-IM02's to be a considerable good upgrade over the CK10. (despite both of them are similarly based on dual-drivers BA)

 

The ATH-CK100PRO was the previous BA line-up flagship model from Audio-technica, before the current IM series were being introduced. The CK100PRO's can often be misunderstood by many people especially if the listener has only listened to it only for a short amt of time, which also further implicate matters if you do not have the correct or pairing synergy of DAP/portable AMP as this ATH iem does suffer quite abit from acoustic/electrical damping issues due to the OI factor (output impedance) from various DAPs found on the current market. After some experimentation and findings via some taiwanese owners as well as my own, this issue can typically be fixed by using an additional impedance adapter (anywhere btw 30 ohms to 75 ohms depending on the OI of your player) btw the DAP and the iems, and it should solve the electrical damping issues of the CK100PRO, and gives it a more smoother response across the whole FR spectrum, w/o too much peaks around the upper-mids/lower treble regions.

Via my current Sony Walkman Z/TTVJ Slim combo setup it sounds quite alright to my ears, but is definitely not the most euphonic sounding pair of iems under my current possession. Best portable combo setups I have tried with the CK100PRO so far, were combinations such as the iPod Classic 5.5G + Centrance Hifi-M8 and an iPhone 4S + Fostex HP-P1. Single DAP setups that I have tried that sounds quite good to me were via the Astell & Kern AK120 and my previous older Sony Walkman the NW-HD5 which I still own today.

 

The overall signature of the CK100PRO's lies more on the aggressive, dry side of things and thus are not the most euphonic or musically-involving pair of iems that would invoke emotions easily when listening to vocals/acoustic stuffs with them. It is however a very revealing iem as reviewed/concured by another fellow Head-fier [URL="http://www.head-fi.org/t/687962/asg-2-ck100pro-ue900-and-fa-4e-xb-reviews-the-dysfunctional-family"]MoonYeol[/URL], so if you are someone who appreciates iem trait characteristics of highly-resolving detail and excellent clarity/transparency and you are a lover of genres such as classicals/orchestras, you owe it to yourself to at least listen to this pair of iems for yourself.

 

With the ATH-IM02 now in the picture, I consider the two family sibling members to complement each other quite well actualy. While the CK100PRO soundstage properties are quite abit more expansive, immersive and holographic to my ears, I personally think the IM02 is not too far behind either and has very decent depth/width properties. In terms of overall resolution/detail, the CK100PRO however does it better as it is extremely resolving at both low and high frequencies, as both its bass and treble texture are astoundingly detailed and other well-known TOTL universals on the market which have quad-drivers implemented in them such as the W4R/UE900 are no match against the CK100PRO's. (which another fellow headifer [URL="http://www.head-fi.org/t/585007/review-ck100pro-unboxing-impressions-a-retrospective-journey-with-audio-technica-and-versus-ck100/135#post_9650700"]a_recording[/URL] who has done many IEM/headphone reviews for the community agrees with me)

 

However, the ATH-IM02 do have some very good redeeming qualities to themselves and still manages to put up a pretty solid fight against the CK100PRO. IMO the ATH-IM02 are a much better vocal performer/specialist here, it possess a very nice midrange presence and its treble is of very good quality as well. (percussive instruments such as cymbals will not sound dead/rolled-off in short, as it has good sparkle and bite to it).

The ATH-IM02's are quite a pair of euphonic-sounding iems to my ears and they don't exactly bear any weakness when it comes down to either male or female vocalists (which cannot be said the same for the CK100 non-PRO model). In terms of sub-bass impact/rumble quality I also seemed to have noticed it performs quite abit more favourably to my ears against the rest of the CK100PRO/CK100/CK10 line-up respectively. (take note bass impact/rumble details are not to be mixed up with bass texture/resolution so do not be confused and mix them up)

 

I should however mention in terms of cables microphonic level/wearing comfort wise, it is indeed a tier lower compared to relatively well-known AT IEM's around the community here such as the CK100/CK10 models which was concured by another fellow Head-fier who is from my country as well, known as Randius on Head-fi. Owners will definitely encounter some microphonic issues with these, and in terms of wearing comfort they certainly do not compare that favourably against the previous CK10 as well. If you have never had any usage experience with either the CK100 or CK10, then this might not bother you so much but coming from previous AT flagship models like the CK100/CK10, I have to personally bring up this and admit that in this area, the AT-IM02 disappoints alittle here.

:(:(

 

At the current street pricing that these are retailing at, I do not see why anyone wouldn't be attracted by the IM02's even when comparing these to new heavyweights on the market such as the Westone's W20 or even the popular Shure's SE535 LTD Red edition that are known to be good with vocal genres. I would highly recommend these iems to anyone who are looking for something to listen to male/female vocals with, especially with their high C/P value tagged to it.

 

The ATH-IM02 gets the highly recommended, thumb of approval from me. Do check them out soon, and of course sorry about your wallet too if you do manage to take the plunge into these!

:etysmile: 

post #272 of 418
Quote:
Originally Posted by quartertone View Post  I noticed that immediately - I find that often tends to be the case with their stock tips. Thinner tips are better.


Yeah, thin, soft tips are good for the IM series.

 

I didn't think the tips were a big issue because I kept EQing the IM50's bass down and thought it was an issue of the tips not being good with the IM50/70, but I noticed the same issue with the IM04.

post #273 of 418
Quote:
Originally Posted by Haonan View Post























Just cross-posting the short review I wrote for the ATH-IM02's from one of my local forums HardwareZone, over here since I see there have been some active discussions about the current IM balanced armature series in terms of Audio-technica's latest wave of releases. My pair of ATH-IM02's has been burnt in for at least 80 hours prior before I wrote the following review, as I got these sometime last year shortly after Christmas Day but since I'm more of a lurker and infrequent Head-fi poster, thus I was quite late in contributing my own impressions/findings about them.

I will not be A/Bing them against the CK100 as both models bear quite abit of different signature/SQ traits to them, but I personally do consider the ATH-IM02's to be a considerable good upgrade over the CK10. (despite both of them are similarly based on dual-drivers BA)

The ATH-CK100PRO was the previous BA line-up flagship model from Audio-technica, before the current IM series were being introduced. The CK100PRO's can often be misunderstood by many people especially if the listener has only listened to it only for a short amt of time, which also further implicate matters if you do not have the correct or pairing synergy of DAP/portable AMP as this ATH iem does suffer quite abit from acoustic/electrical damping issues due to the OI factor (output impedance) from various DAPs found on the current market. After some experimentation and findings via some taiwanese owners as well as my own, this issue can typically be fixed by using an additional impedance adapter (anywhere btw 30 ohms to 75 ohms depending on the OI of your player) btw the DAP and the iems, and it should solve the electrical damping issues of the CK100PRO, and gives it a more smoother response across the whole FR spectrum, w/o too much peaks around the upper-mids/lower treble regions.
Via my current Sony Walkman Z/TTVJ Slim combo setup it sounds quite alright to my ears, but is definitely not the most euphonic sounding pair of iems under my current possession. Best portable combo setups I have tried with the CK100PRO so far, were combinations such as the iPod Classic 5.5G + Centrance Hifi-M8 and an iPhone 4S + Fostex HP-P1. Single DAP setups that I have tried that sounds quite good to me were via the Astell & Kern AK120 and my previous older Sony Walkman the NW-HD5 which I still own today.

The overall signature of the CK100PRO's lies more on the aggressive, dry side of things and thus are not the most euphonic or musically-involving pair of iems that would invoke emotions easily when listening to vocals/acoustic stuffs with them. It is however a very revealing iem as reviewed/concured by another fellow Head-fier [URL="[URL=http://www.head-fi.org/t/687962/asg-2-ck100pro-ue900-and-fa-4e-xb-reviews-the-dysfunctional-family]http://www.head-fi.org/t/687962/asg-2-ck100pro-ue900-and-fa-4e-xb-reviews-the-dysfunctional-family"]MoonYeol[/URL[/URL]], so if you are someone who appreciates iem trait characteristics of highly-resolving detail and excellent clarity/transparency and you are a lover of genres such as classicals/orchestras, you owe it to yourself to at least listen to this pair of iems for yourself.

With the ATH-IM02 now in the picture, I consider the two family sibling members to complement each other quite well actualy. While the CK100PRO soundstage properties are quite abit more expansive, immersive and holographic to my ears, I personally think the IM02 is not too far behind either and has very decent depth/width properties. In terms of overall resolution/detail, the CK100PRO however does it better as it is extremely resolving at both low and high frequencies, as both its bass and treble texture are astoundingly detailed and other well-known TOTL universals on the market which have quad-drivers implemented in them such as the W4R/UE900 are no match against the CK100PRO's. (which another fellow headifer [URL="[URL=http://www.head-fi.org/t/585007/review-ck100pro-unboxing-impressions-a-retrospective-journey-with-audio-technica-and-versus-ck100/135#post_9650700]http://www.head-fi.org/t/585007/review-ck100pro-unboxing-impressions-a-retrospective-journey-with-audio-technica-and-versus-ck100/135#post_9650700"]a_recording[/URL[/URL]] who has done many IEM/headphone reviews for the community agrees with me)

However, the ATH-IM02 do have some very good redeeming qualities to themselves and still manages to put up a pretty solid fight against the CK100PRO. IMO the ATH-IM02 are a much better vocal performer/specialist here, it possess a very nice midrange presence and its treble is of very good quality as well. (percussive instruments such as cymbals will not sound dead/rolled-off in short, as it has good sparkle and bite to it).
The ATH-IM02's are quite a pair of euphonic-sounding iems to my ears and they don't exactly bear any weakness when it comes down to either male or female vocalists (which cannot be said the same for the CK100 non-PRO model). In terms of sub-bass impact/rumble quality I also seemed to have noticed it performs quite abit more favourably to my ears against the rest of the CK100PRO/CK100/CK10 line-up respectively. (take note bass impact/rumble details are not to be mixed up with bass texture/resolution so do not be confused and mix them up)

I should however mention in terms of cables microphonic level/wearing comfort wise, it is indeed a tier lower compared to relatively well-known AT IEM's around the community here such as the CK100/CK10 models which was concured by another fellow Head-fier who is from my country as well, known as Randius on Head-fi. Owners will definitely encounter some microphonic issues with these, and in terms of wearing comfort they certainly do not compare that favourably against the previous CK10 as well. If you have never had any usage experience with either the CK100 or CK10, then this might not bother you so much but coming from previous AT flagship models like the CK100/CK10, I have to personally bring up this and admit that in this area, the AT-IM02 disappoints alittle here.
frown.giffrown.gif

At the current street pricing that these are retailing at, I do not see why anyone wouldn't be attracted by the IM02's even when comparing these to new heavyweights on the market such as the Westone's W20 or even the popular Shure's SE535 LTD Red edition that are known to be good with vocal genres. I would highly recommend these iems to anyone who are looking for something to listen to male/female vocals with, especially with their high C/P value tagged to it.

The ATH-IM02 gets the highly recommended, thumb of approval from me. Do check them out soon, and of course sorry about your wallet too if you do manage to take the plunge into these!
etysmile.gif  

This was a great dog fight, I hope you continue to enjoy the iems as I am, especially the vocals.

I have to say, I'm jelly. You have some seducing pictures of the ck100pro$, and it seems that my wallet is missing in action, which is lucky for it as I won't force it to drop it's money for.a pair of fine sound jewelry.
post #274 of 418
Quote:
Originally Posted by tomscy2000 View Post
 
Quote:
Originally Posted by quartertone View Post  I noticed that immediately - I find that often tends to be the case with their stock tips. Thinner tips are better.


Yeah, thin, soft tips are good for the IM series.

 

I didn't think the tips were a big issue because I kept EQing the IM50's bass down and thought it was an issue of the tips not being good with the IM50/70, but I noticed the same issue with the IM04.

 

The AT phones I've had all seemed to have the same tips, and the above is just as true of the CKM500 and CKS1000, for example.

post #275 of 418
Has anyone done a comparison of the ck10 to the im02? At first glance I've only seen some saying the im02 is better but not direct comparisons in bass, mids and treble.
post #276 of 418
Quote:
Originally Posted by Haonan View Post Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)


 

Just cross-posting the short review I wrote for the ATH-IM02's from one of my local forums HardwareZone, over here since I see there have been some active discussions about the current IM balanced armature series in terms of Audio-technica's latest wave of releases. My pair of ATH-IM02's has been burnt in for at least 80 hours prior before I wrote the following review, as I got these sometime last year shortly after Christmas Day but since I'm more of a lurker and infrequent Head-fi poster, thus I was quite late in contributing my own impressions/findings about them.

 

I will not be A/Bing them against the CK100 as both models bear quite abit of different signature/SQ traits to them, but I personally do consider the ATH-IM02's to be a considerable good upgrade over the CK10. (despite both of them are similarly based on dual-drivers BA)

 

The ATH-CK100PRO was the previous BA line-up flagship model from Audio-technica, before the current IM series were being introduced. The CK100PRO's can often be misunderstood by many people especially if the listener has only listened to it only for a short amt of time, which also further implicate matters if you do not have the correct or pairing synergy of DAP/portable AMP as this ATH iem does suffer quite abit from acoustic/electrical damping issues due to the OI factor (output impedance) from various DAPs found on the current market. After some experimentation and findings via some taiwanese owners as well as my own, this issue can typically be fixed by using an additional impedance adapter (anywhere btw 30 ohms to 75 ohms depending on the OI of your player) btw the DAP and the iems, and it should solve the electrical damping issues of the CK100PRO, and gives it a more smoother response across the whole FR spectrum, w/o too much peaks around the upper-mids/lower treble regions.

Via my current Sony Walkman Z/TTVJ Slim combo setup it sounds quite alright to my ears, but is definitely not the most euphonic sounding pair of iems under my current possession. Best portable combo setups I have tried with the CK100PRO so far, were combinations such as the iPod Classic 5.5G + Centrance Hifi-M8 and an iPhone 4S + Fostex HP-P1. Single DAP setups that I have tried that sounds quite good to me were via the Astell & Kern AK120 and my previous older Sony Walkman the NW-HD5 which I still own today.

 

The overall signature of the CK100PRO's lies more on the aggressive, dry side of things and thus are not the most euphonic or musically-involving pair of iems that would invoke emotions easily when listening to vocals/acoustic stuffs with them. It is however a very revealing iem as reviewed/concured by another fellow Head-fier [URL="http://www.head-fi.org/t/687962/asg-2-ck100pro-ue900-and-fa-4e-xb-reviews-the-dysfunctional-family"]MoonYeol[/URL], so if you are someone who appreciates iem trait characteristics of highly-resolving detail and excellent clarity/transparency and you are a lover of genres such as classicals/orchestras, you owe it to yourself to at least listen to this pair of iems for yourself.

 

With the ATH-IM02 now in the picture, I consider the two family sibling members to complement each other quite well actualy. While the CK100PRO soundstage properties are quite abit more expansive, immersive and holographic to my ears, I personally think the IM02 is not too far behind either and has very decent depth/width properties. In terms of overall resolution/detail, the CK100PRO however does it better as it is extremely resolving at both low and high frequencies, as both its bass and treble texture are astoundingly detailed and other well-known TOTL universals on the market which have quad-drivers implemented in them such as the W4R/UE900 are no match against the CK100PRO's. (which another fellow headifer [URL="http://www.head-fi.org/t/585007/review-ck100pro-unboxing-impressions-a-retrospective-journey-with-audio-technica-and-versus-ck100/135#post_9650700"]a_recording[/URL] who has done many IEM/headphone reviews for the community agrees with me)

 

However, the ATH-IM02 do have some very good redeeming qualities to themselves and still manages to put up a pretty solid fight against the CK100PRO. IMO the ATH-IM02 are a much better vocal performer/specialist here, it possess a very nice midrange presence and its treble is of very good quality as well. (percussive instruments such as cymbals will not sound dead/rolled-off in short, as it has good sparkle and bite to it).

The ATH-IM02's are quite a pair of euphonic-sounding iems to my ears and they don't exactly bear any weakness when it comes down to either male or female vocalists (which cannot be said the same for the CK100 non-PRO model). In terms of sub-bass impact/rumble quality I also seemed to have noticed it performs quite abit more favourably to my ears against the rest of the CK100PRO/CK100/CK10 line-up respectively. (take note bass impact/rumble details are not to be mixed up with bass texture/resolution so do not be confused and mix them up)

 

I should however mention in terms of cables microphonic level/wearing comfort wise, it is indeed a tier lower compared to relatively well-known AT IEM's around the community here such as the CK100/CK10 models which was concured by another fellow Head-fier who is from my country as well, known as Randius on Head-fi. Owners will definitely encounter some microphonic issues with these, and in terms of wearing comfort they certainly do not compare that favourably against the previous CK10 as well. If you have never had any usage experience with either the CK100 or CK10, then this might not bother you so much but coming from previous AT flagship models like the CK100/CK10, I have to personally bring up this and admit that in this area, the AT-IM02 disappoints alittle here.

:(:(

 

At the current street pricing that these are retailing at, I do not see why anyone wouldn't be attracted by the IM02's even when comparing these to new heavyweights on the market such as the Westone's W20 or even the popular Shure's SE535 LTD Red edition that are known to be good with vocal genres. I would highly recommend these iems to anyone who are looking for something to listen to male/female vocals with, especially with their high C/P value tagged to it.

 

 

 

The ATH-IM02 gets the highly recommended, thumb of approval from me. Do check them out soon, and of course sorry about your wallet too if you do manage to take the plunge into these!

:etysmile: 

How does it compare to the EX800st?

post #277 of 418
Quote:
Originally Posted by shotgunshane View Post

Has anyone done a comparison of the ck10 to the im02? At first glance I've only seen some saying the im02 is better but not direct comparisons in bass, mids and treble.

I finally returned to my ck10s after a while of resting for the holidays. 

 

Playing beatles, and racounteurs has helped me understand the sound sig differences.

 

The bass on both are about the same in texture, but there is more rumble with the im-02s when compared to the ck10s, possibly due to the plastic housing.

 

The mids are better, a bit more fuller, and still smooth on the im-02s, but not as smooth as the ck10s and is a bit more refined, as well as more sensitive.

 

Highs are my favorite on the im-02 phones, but it can make or break your music if you get the bad quality recordings, or raise the volumes to a high level.

 

As haonan said, the highs texture are around the same, but I give the thumbs up to im-02 for sounding more detailed at the same db as the ck10s. if the db of the im-02s exceed that of the ck10s, the highs will tend to be a bit harsher than the ck10.

post #278 of 418

The real question is comparing the CK90PRO MK2 with the IM02... I am 99% certain they're using the same drivers (without crossover changes) and acoustic horn path. The only difference would then be fit and possibly a damper change (ATH uses its own foam dampers, rather than ready-made ones from Knowles/Sonion), which do play into the perception of sound. The IM02 will feel fuller and more stable in the ear, leading to a perception of better sound. However, when I heard the IM02, I thought it sounded largely the same as the CK90PRO MK2.

post #279 of 418
Quote:
Originally Posted by tomscy2000 View Post
 

The real question is comparing the CK90PRO MK2 with the IM02... I am 99% certain they're using the same drivers (without crossover changes) and acoustic horn path. The only difference would then be fit and possibly a damper change (ATH uses its own foam dampers, rather than ready-made ones from Knowles/Sonion), which do play into the perception of sound. The IM02 will feel fuller and more stable in the ear, leading to a perception of better sound. However, when I heard the IM02, I thought it sounded largely the same as the CK90PRO MK2.

That is a good question. If that is true, than that is kind of sad for the ck10s, as the im-02s sound better to me than the ck10s. 

post #280 of 418
Quote:
Originally Posted by vlenbo View Post  That is a good question. If that is true, than that is kind of sad for the ck10s, as the im-02s sound better to me than the ck10s. 


That's always a possibility, but it's probably due to personal preference. The IM02 uses a Knowles GQ driver, which is a vented ED for lows and WBFK for highs, while the CK10 uses the TWFK, which has a vented FK for lows and WBFK for highs. An ED driver is about three times as big as the FK driver. It'll be able to deliver more convincing lows. In terms of the other areas, it depends on the resonance interactions between the low and high drivers. Even though the two both use a WBFK, they won't behave exactly the same because of resonance interactions, affecting the frequency response, perception of timbre, etc. BTW, this exact driver is what's used in the CK90PRO/MK2/IM02.

 


 

As an aside, I hooked up the IM50 to my Concero HP and applied the following simple parametric EQ:

 

 

The results are uncanny; it's hard to think that these earphones are only $50-ish.

 

I realize that I'm kind of cheating by hooking it up to one of the most revealing DAC/amps I've ever heard, but the IM50 does scale beautifully.

 

The dual drivers really do a good job of maintaining control over the entire spectrum.

 

At this point, however, I dislike the fact that I have to EQ down the bass in order to get a tonal balance that I prefer. I'm very lazy about EQing and prefer not to EQ at all.

 

I will probably put the IM50 up for sale once I get the AS Rockets.

post #281 of 418
Quote:
Originally Posted by tomscy2000 View Post
 


That's always a possibility, but it's probably due to personal preference. The IM02 uses a Knowles GQ driver, which is a vented ED for lows and WBFK for highs, while the CK10 uses the TWFK, which has a vented FK for lows and WBFK for highs. An ED driver is about three times as big as the FK driver. It'll be able to deliver more convincing lows. In terms of the other areas, it depends on the resonance interactions between the low and high drivers. Even though the two both use a WBFK, they won't behave exactly the same because of resonance interactions, affecting the frequency response, perception of timbre, etc. BTW, this exact driver is what's used in the CK90PRO/MK2/IM02.

 


 

very,very interesting. thanks for the info.:beerchug:

 

do you know what the rest of the im0# use??:popcorn:

post #282 of 418
Quote:
Originally Posted by Zelda View Post  do you know what the rest of the im0# use??:popcorn:

 

I don't know for sure; only the IM02 is confirmed from impedance/sensitivity measurements, along with visual confirmation. The IM01 uses a new driver, different from the CK70PRO. The CK70PRO used a Sonion 2359, but the IM01 now uses either something from the Sonion 2600 series or the Knowles RAB series. I'm leaning toward the latter. The IM03 uses a special assembly, I don't know what it is, but I do know it is the same as the CK100PRO's assembly. The IM04 uses the Sonion 1723 AcuPass, plus either the Knowles DTEC series or Sonion 3300 series.

post #283 of 418

Loving the IM04, perhaps the midbass a few dB more than my liking but really sweet IEM, very comfy fit. 

 

Sounds completely different to their older flagship (the ck100pro) but that is a good thing in my opinion. 

post #284 of 418
Woul
Quote:
Originally Posted by audionewbi View Post

Loving the IM04, perhaps the midbass a few dB more than my liking but really sweet IEM, very comfy fit. 

Sounds completely different to their older flagship (the ck100pro) but that is a good thing in my opinion. 
Would you mind making a mini review of IM04 and an A/B with CK100PRO? I'm very interested in this IEM and reviews are hard to find. Thanks in advance
post #285 of 418
Quote:
Originally Posted by sect44 View Post

Woul
Would you mind making a mini review of IM04 and an A/B with CK100PRO? I'm very interested in this IEM and reviews are hard to find. Thanks in advance

I do not mind but it is very hard for me to explain it in more indepth than what I have already wrote. Maybe if you can ask me some specific question I can give you the most honest answer I can possibly give.

 

Output impedance is really important for the IM04. For instance upon connecting to the Ak120 their was a great bleeding between the bass and mid-range which gave me a very bad shock. I tried with different tune and the sound was still the same when the bass and mid-range was the key player. As soon as I connected with an AMP problem was disappeared. CK100PRO did not have this problem with AK120 but IM04 does. 

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