Comply Foam Tips and the Effects of Tip Selection Page 2

Properly Preparing of Comply Tips for Insertion
Comply tips have two parts: the outer foam; and a stiffer inner tube of plastic that slides over the nozzle of the earphone. The rounded end of the foam extends further than the inner tube. When squishing the foam between your fingers prior to insertion, if you simply roll the tip between your fingers the foam remains longer than the tube. I think this extra foam at the tip can push against the side of your ear canal at the bend and may partially or completely block the end of the tube from which sound emits. This will muffle the sound.

On the other hand, if you prepare the tip by pressing the foam rearward as you compress it, you can make the inner tube the most forward part as it is inserted, making it far less likely to close off as it hits the bend in your ear canal.

I think a video will make this clear:

As an alternative, some people use a razor blade to cut off the end of the foam at the tip. Others will install the tip backwards as the foam and inner plastic of the tube are the same length at the back. These methods probably work fine, but I've simply not found the need if you prepare the tip as shown in the video.

Cleaning Comply Tips
Because of their tacky nature, Comply tips pick up dirt and ear wax rather easily. The best way to have clean tips is to clean you ears regularly, and have clean hands when preparing the tips for use. None the less, the tips will eventually get dirty.

The Comply tips are a very special material and can easily be damaged (disintegrated in some cases) if alcohol, mineral spirits, or other volatile chemicals are used for cleaning. Comply recommends that you simply dampen a cloth with warm water and wipe them down. Then leave the tip to dry overnight. If you soak the tips in water, some of the chemicals in the material will leach out and the tips may degrade more quickly.

Summary
I've found the Comply tips to have very little effect on the sound quality of my IEMs, which is born out in the measurements made. I've also found them to provide excellent isolation, though I didn't do measurements to confirm.

The comfort provided by Comply tips is simply extraordinary. In every case I've tried they are a significant improvement over the stock tips that come with the earphones. Additionally, the security of fit in my ears was much better than stock silicon tips.

Comply tips are about double the price of stock replacement tips, but the improved comfort and fit make them a no-brainer for me. Highly recommended!

Resources
Comply web site.
Head-Fi Comply Tip review and another.

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COMMENTS
inarc's picture

Thank you for the article.
I am surprised at the measured frequency responses of the Etymotic ER-4PT as they markedly differ from the previous measurement:
http://www.innerfidelity.com/images/EtymoticER4PT.pdf
Can you explain this?

ultrabike's picture

Thank you! Comply Tips make my ears happier, but they may not last as long as the stock silicon tips :(

EDITED OUT the Goldenears comparison comments, since I think you explained the performance difference cause fairly well. In any case, below is the link to Goldenears measurements for the Audeo PFE with and with out Comply tips:

http://en.goldenears.net/2184

Originally I read your article @ work and cannot watch the video there due to filters... Any how I just got around to watch it and I'm satisfied with your explanation. It is my best guess that Goldenears might have muffled the sound similar to what you just described during measurements.

My only concern with your advice for Comply tip insertion is that while it may improve the sound, the contact of the tube with the ear internals might cause some discomfort... What are your thoughts on that?

MacedonianHero's picture

Thanks for this Tyll. I've been curious about this subject for a while too. My experiences match your comments here as well. For the record, I use Comply tips with both my Westone 4s and TF10s.

dondapatirc's picture

First of all thanks for educating everyone about this Comply tips.
I do have the same angle in my left ear as yours.
When I started using Comply TX100 (with ear wax protection) tips for my Phiaton PS200 earphones, they started SINGING and whatever the sharp high frequency peaks present were gone (even at high volumes). With PS200 beautiful soundstage I enjoyed ever single song I played. But lot of people even ljokerl said that using foam tips affect sound quality. And for me they were perfect.
Please try it (as you have PS200 too).

thanks once again !

ultrabike's picture

I agree with you @dondapatirc, I felt Comply tips improved the sound by removing high frequency pics. But Tyll, correct me if I wrong. I thought you said Comply tips have no effect on frequency response at all unless somehow the tip of the Comply tip collapses and blocks the tube output... right?

I guess we have to avoid pushing the tip too far into the ear, or somehow avoid the tip to collapse once inserted as per the video.

Tyll Hertsens's picture
The measurements show a very small change in the highs in some cases, but it seems pretty minor to me. If it does reduce it a tad, I'm cool with that.
ultrabike's picture

I 100% agree. Even when improperly inserted, to say that I love the sound of my PFEs is an understatement.

I stopped using my Audeos for sometime because I didn't know how to use them in the first place, and probably hurt myself a few times by pressing both the silicon and Comply tips way too much into my ear canal, and by not properly removing them, subjecting my ears to all kinds of pressures. During playback I didn't have problems. But 10 min after removing them it felt as if I had water inside my ears... for days!

I'm OK now, but IMHO IEM have a user learning curve for sure... And this article further shows it. The obvious benefits are IEM have amazing sound for the price... Even a noob like me can vouch for that.

Again, Thank you for sharing these not so obvious tips on how to make the most of our gear.

br777's picture

i wouldn't rule out placebo in the perceived change due to comply tips.. as NwAvGuy so often reminds us with science, bias and placebo are very real in our world.

Comply tips are soft, and squishy, the "look" like they would muffle the sound, so some people may create the muffled sound with their expectations.

Tyll Hertsens's picture
This is an excellent point, and I think a rather likely explanation for why the idea is so prevalent.
karotte's picture

In Tyll's measurement, we cannot see any differences between ear sleeves. If some differences exist, they are little significant. However, I feel the differences, specially, between Triple Flange and Black Foam.

Here I link some articles. These reflect well my experiences

http://rinchoi.blogspot.com/2012/04/effect-of-ear-sleeves-etymotic-resea...

http://rinchoi.blogspot.com/2012/04/effect-of-ear-sleeves-etymotic-resea...

http://rinchoi.blogspot.com/2012/04/effect-of-ear-sleeves-sony-mdr-ex100...

I think the effect of chainging ear sleeves in IEM is effected by his or her ear canal shape also. So, not only ear sleeves but also the shapes of the coupler contribute to frequency response data, I think.

Anyway, check the data in the links. These are different with Tyll's measurement. :-)

AstralStorm's picture

Indeed, Comply tips seem to cause a bit less resonances than most silicone, both at low and high frequencies. It's usually really not an issue, in fact beneficial if the resonant peaks are in odd places (e.g. natural ear canal resonances at 3-4kHz, 7-8 kHz).

The resonances seem (yes, I can't measure that, I don't have an in-ear probe) to move lower by approximately 1/4 octave (for my ears) and reduced by 1-3 dB in all the IEMs I have. (VSonic GR07, HifiMan RE272, Brainwavz M2 and Ultimate Ears 4vi)
In case of the VSonic, it's enough to drop it from "sibilant" to "touched up presence". UEs are improved a bit less and are still highly annoying.

I'd attribute that to increased Vas of the ear/IEM system (same reason why foam is sometimes used in speakers) - this should be most relevant for vented and closed IEMs, more noticeable with larger dynamic driver based ones, like your Monster.

Frequency response is not the whole story - care to run a THD test? This should show a measurable difference if I'm right, especially in bass.

chahahc's picture

I was thinking along the same thing too. Kind of along the line that a tube that is sealed at both ends resonates more than a tube that is sealed at one end only. The silicone eartips reflect sound acting like a sealed end (well it is..) and the foam tips acting a bit more like an open end by absorbing the sound....

At least with the etymotic and monsters, the foam tips seem to reduce the 3-4khz "peak". Not so sure about the Phonaks.

I'm a bit unsure on how adding to the natural ear resonance would make things better. Wouldn't adding to any resonance be detrimental? Or would adding to the resonance be compensation for the iem bypassing the outer ear. But then does the outer ear resonate? I thought it just amplified sounds like a horn. Or does it amplify by resonating?. Is that the same thing?...I think my ignorance is showing...

AstralStorm's picture

Actually, the ear is more sensitive in the 3-4kHz region supposedly because it's an average child voice frequency and 7-8k region is used for speech, leaf rustling and various other important natural sounds. Both were an evolutionary advantage.
https://en.wikipedia.org/wiki/Psychoacoustics (note the images)
The actual frequency response at the highest end (>4 kHz) is quite individual and dependent mostly on external ear shape, but typically contains at least higher sensitivity regions.

Good headphones and IEMs should produce sound that has similar frequency response to a source in either free or diffuse field (I prefer free field) at some meters (I'd pick 3) in front dead ahead. Of course any added resonances are detrimental for such a design.

The other way is to tune the whole ear/headphone system to sound flat, but this either requires expensive in-ear probes and statistical data or a very good measurement "ear model", similar to the one Tyll uses.

I use equalization to achieve something similar with very good results by using averaged multiple measurements by ear over longer period of time.
(Test signal being a bunch of sine waves - bandlimited noise might be slightly more faithful but I haven't got around to synthesizing these.)
Multiple parametric equalizers with a wide Q range (up to 6 at least) are best for this adjustment. The whole process is pretty time consuming.

--
Headphones are actually harder to design well, since they must take outer ear into account, esp. positioning of the driver. In case of closed headphones, high frequency resonances are very hard to avoid, since there's a lot of air moved and not enough space to put absorbing material.
One way out of this trap is to use a very high efficiency driver close to the ear and acoustic seal (like Beyerdynamic DT1350), the other is to use a fully open design without any seal, but such that the driver is bass-slanted in near field. (like Sennheiser HD800)

IEMs face a different challenge: it's hard to produce a tiny driver that can create enough bass and be fast and light enough to produce very high frequencies. The obvious answer is to combine more than one driver.
Best dynamic drivers are pretty wideband of course, RE272 can do 22Hz to 18.5kHz - but non-linear in wrong ways.
Getting rid of the resonance is typically easier than in headphones due to lower pressures involved - the best such system known to me is the material used by FutureSonics in their Ear Monitors.
IEMs are always resonant in some way, because they have to maintain a seal with the ear canal to attain necessary high efficiency.
That doesn't preclude making an open back IEM (with less resonance), but of course the isolation will be abysmal. Most IEMs are of vented design.

Balanced armatures produce far less resonances due to radiating sound 90 degrees to the side and possibility of mounting them in positions closer to optimal due to small size. A similar trend in new dynamic driver designs is also to mount the driver 90 degrees tilted (e.g. Sony MDR-EX1000, Spider RealVoice) or 45 degrees tilted (HifiMan RE272).

ultrabike's picture

Thank you for your insightful comment. I will likely re-read it a few times to digest it :)

"bandlimited noise might be slightly more faithful but I haven't got around to synthesizing these."

In the design, characterization, and use of digital communications systems, generating sequences that behave as white noise is of extreme importance. In fact, they are key and heavily used in modern communication systems for the purposes of timing recovery, channel estimation, and error correction... I you want an example of a relatively complex digital communication system used heavily in audio: the CD player.

Anyhow, m-sequences are the main tool for generating white noise sequences. These odd binary sequences have the following important properties: 1) Their auto-correlation function is an almost perfect impulse (has DC offset of 1/length-of-sequence ), 2) Their frequency response is flat (including DC given the DC offset) across the band, 3) Easy to generate. This wikipedia link is actually good source of info about them:

http://en.wikipedia.org/wiki/Maximum_length_sequence

This sequences have been used to derive impulse and frequency response of twisted pair.

One thing to be mindful about characterization of a system, is that bandlimited impulses will have a sync like appearance in time domain. For example, the Shure 535 impulse response, and square waves in Tylls plots show this ringing on the front and back of the waves. This maybe due to the response of the ear phone, but this ringing is what you would expect in the characterization of an almost perfect headphone due to the fact that both the headphone and the measurement system is bandlimited. The only thing you can do is control the ringing by windowing with something other than a sharp rectangular frequency mask. A very sharp frequency cut will yield a ton of ringing. Almost no ringing will mean a slower roll off at the corner frequencies.

Another thing about the Shure 535 impulse response that catches my eye is that it shows the earphone reproduces signal to almost DC. This can be seen by the fact that the impulse response has more energy above zero than bellow it (DC offset)...

Anyway... sorry 'bout my ramblings :)

AstralStorm's picture

Yes, you surely are rambling - best lowpass filters have very minor aliasing, better than 100 dB rejection floor, not too long impulse response and bandwidth better than 95%. (for example, see SoX resampling lowpass very high quality with aliasing enabled, e.g. here: http://sox.sourceforge.net/rate-44k1-96k.png - option vMa is the 100% post-ringing (which is tunable) slightly aliasing lowpass; a similar filter has been recently written by Igor Petrov too, but it's not opensource)

The main reason is that the sine is not affected by any IMD and less affected by THD, so the higher harmonics will not be heard during the equalization if there are any as opposed to one done with a more complex signal.

ultrabike's picture

Rambling is ma middle name :) I was really trying to give you ideas for generating a white noise like signal for the purposes of characterization... I may even give you a few liners of MATLAB code to create some... It is really no big deal to make them and can show you how to generate an impulse response out of them :)

Low pass filters: I'm really not an audio low pass filter guru. But I know a one or two about some of them :) How good a low pass filter is depends on what you are trying to accomplish. I've used mostly IIR filters because they are practical. However depending of what you use, they can mess up your phase. I use mostly Butterworth 5th order. Butterworth filters are maximally flat in the pass band with a 20dB/decade after the cut-off (EDIT: 20dB/decade/order i.e. 5th order Butterworth will have 100dB/decade... UPS!). They don't mess up the phase that much. I have used Chebyshev filters which are more flexible than the Butterworth as they allow you to trade off pass band flatness for roll-off (better than Butterworth). For certain Delta-Sigma applications I have preferred using Bessel since these are the ones that affect the phase the least out of the IIR filters I mentioned. But their roll-off is really slow (worse). If you want to get as close as possible to a brick-wall, then Elliptic is the way to go, though you are going to pay the price in the phase response... Analog Butterworth filters are used quite a bit before sampling (ADC) to avoid aliasing.

For anti-aliasing in the digital domain, CIC filters are used quite a bit... They are really nice implementations of a classical averager but with only an added and subtracter (need feedback). Since an average DOES NOT have flat pass-band, compensation is used in the last stage.

In the FIR class we have Remez, which I almost never use but is cool, and the Sinc filter which can be viewed to belong to the raised cosine filter family (beta = 0). A Sinc filter is NOT causal but you can window it so that its close. The result is an almost perfect brickwall in the frequency domain...

Now, 100dB rejection. A Butterworth can give you 100 dB rejection depending on your sampling rate and the bandwidth chosen for the Butterworth (0 to pi in the z-domain)... Which is probably what you said... Will it be ringing free? In the frequency domain YES, it is a maximally flat filter. Will it be the BEST? in terms of roll-off NO, the elliptic filter will kick its butt at the expense of other parameters...

Back to the impulse response, if you are sending a 500kHz m-sequence nicely shaped by a square root raised cosine filter to avoid intersymbol interference (and receiving it that way at the other end properly by match filtering it), you may see no issues when characterizing a headphone with it whose response stops at 20kHz... Who knows man YOU ARE MAKING ME THINK :(

What I find interesting about the Shure 535 is that it's response has a slight ring at both edges of the impulse response... almost looking like a Sinc... You don't? Then look at those square wave responses having the same small ring at both edges! How the hell did they did that?!

EDIT: I think I know where you are coming from with the Aliasing :) ... I DON'T think the ringing is due to the measurement equipment or aliasing. NOT AT ALL. I believe that is probably as close as an impulse response model of the headphone as one is going to get. The POINT IS, the Shure 535 looks A LOT to what (I would expect) an ideal headphone might measure in the time domain: A Sinc or a type of a window function. Why? Because if you want flat frequency response from 0 to x kHz and then nothing after that is exactly what you are going to get. That may not be what you want though due to the ear gains here and there (I'm aware of that too). Back to the Shure 535 the uncompensated frequency response is almost flat down to 1kHz and a smooth slight bump from there onto 8kHz. Some more minor ringing and kind of brick walls at around 12kHz only to come backup slightly around 16kHz. I think that strong decay at 12kHz coupled with very deep low frequency extension gives rise to the ringing in impulse response both before and after the main lobe, which in turn give rise to those interesting looking square waves... Just a theory.

AstralStorm's picture

The ring in Shure SE535 response is not at all due to bandwidth limitation of the driver, but due to lack of enough electrical damping in its balanced armatures - that is actually quite common in the small drivers such as ones used in headphones.
Far less common in larger dynamic drivers, since they have some mechanical damping and in certain designs "air braking" is important as well.
Shure's ringing is reasonably low in magnitude and acceptable, in comparison to e.g. Etymoic ER4PT. However, Audeo PFE 121 (w/ Green or Black filters) and even Klipsch X10 beats it hands down.

There *might* be added ringing in the crossover region between its two drivers due to the crossover - but there's not in this case, as it uses a nice third order Bessel (12 dB/oct) crossovers - easily seen in the phase response - with the low end driver having a knee frequency of 800 Hz and high driver using knee frequency of 4500 Hz.

IIR filters are very hard to do right in comparison with FIR filters. You trade phase distortion, amplitude distortion and tranisition only. In FIR, ringing and aliasing can be traded as well.
Remez exchange filters are nice in impulse response and but relatively slow transition.

It doesn't matter in which domain (digital or analog) you do the filtering as long as you do it before final sampling at wanted bandwidth.

ultrabike's picture

Man I really wish there was a way to move replies to the left. They get all squished to the right :(

"The ring in Shure SE535 response is not at all due to bandwidth limitation of the driver, but due to lack of enough electrical damping in its balanced armatures"

Interesting. I guess is hard to fit damping in such a small structure. I don't think the ringing is due to just the bandwidth of the armature. I think is related also to the VERY step cut off of the whole system. The steeper the cut-off the more ringing I guess.

Man I wish Tyll had a way to download the raw impulse response data so I could prove this points to myself and others :)

"There *might* be added ringing in the crossover region between its two drivers due to the crossover - but there's not in this case, as it uses a nice third order Bessel (12 dB/oct) crossovers - easily seen in the phase response - with the low end driver having a knee frequency of 800 Hz and high driver using knee frequency of 4500 Hz."

That is pretty cool info man. Yes,the phase does seem to change at those frequencies! Nice catch! I still think the ringing is due to the sharp cutoff and bw of the whole system (crossovers included)

IIR filters are hard to do in high orders due to stability in the analog domain, and bit width precision in the digital domain. But at least in the digital domain, the delay lines are very small compared to FIR. Trade-offs :)

BTW, AGAIN nice catch on the phase response reading! I kind of agree with you on that Bessel filtering and order stuff @ the cross-over! Really good one!

bigb121074's picture

I found that the comply's sounded the most muddled on my RE-0's. I also tend to push those as far as I can into my ears to get a better fit. My ears have a sharp bend in them about a half inch in. The comply's did not sound as muddled in my Westone W4R's, as they do not have to go in far to get a good fit. Thanks, Tyll, for the hard work and the tips (no pun intended.)

AstralStorm's picture

Make sure you're not using too large size for your ears. I've had similar effect with RE272 when using medium ones - the foam tended to block the sound.

Laurence Wayne's picture

Tyll- I've been remiss in not commenting on a couple of topics. First and foremost, Happy Anniversary! I've been a fan of yours and enjoyed your writing from the Stereophile ad days. (Do you recall how they lamented my assertion that your writing was the best in the magazine?)
Next, my wife did the MOD to my HD800s-thoroughly enjoying following the video. You asked for response and I must say it was curious. Really helpful with the mids and bass, but didn't seem to tame the highs. So better, just not best. (I use with an RSA Emmeline Raptor II.) On the current Comply topic, you are spot-on in my experience. That said, and having the same left ear issue, and stumbling upon custom molds I had made 10 years ago for Etys, and calling Etymotic (nice folks) and finding that the molds still fit me and the current ER4PT, I ordered the ER4PT. Obviously more in tune with my comfort level but still the "anemic"-my hearing-bottom. The reason I abandoned them long ago. Enter a new discovery:
http://www.digizoid.com/. The digiZoid2 sub is a gem for solving that issue. I know, I know, "purism", but if you can MOD an HD800, why not?
Thanks for the effort, care, and concern which goes into Innerfidelity. Your work is appreciated.
Judge Laurence Wayne

ultrabike's picture

Thank you dude! Really cool! I MAY ACTUALLY BUY THE ZO!!! Again Thank you!

Smiling Kev's picture

Thanks very much for the informative and entertaining look at the Comply tips, Tyll. Your video about how to prepare them for insertion gave me the answer to why the gray foam tips (cylinders with squared-off ends, third from left in your picture at the start of the review) work so well for me with my Etymotic MC3s and HF5s. Since the foam doesn't project beyond the end of the sleeve, even after being rolled tightly before insertion, there is nothing to block the end of the sleeve when it makes its way around and through bends in my ear canals.

Although the EOM gray foam tips from Ety are very comfortable for me - and don't seem to interfere in any way with the music I hear - I still might give the Comply tips a try. Maybe Santa will bring me a set next Xmas. He needs to, because the two lumps of coal he left me this year are NOT at all comfortable in my ears - and I haven't had much success connecting them to my headphone amp!

Thanks again! I really enjoy your web site and I frequently rely on your insights and opinions to help me make decisions about equipment.

AstralStorm's picture

Comply TS series are a nice new spin on the basic design, quite a bit more comfortable to my ears. Unfortunately, they don't make these in small size yet, so I can't use them with any of my IEMs without high frequency rolloff.

CarlSeibert's picture

Complys do wear out. I assume that something leeches, either in or out, over time. When they're done, they won't sound quite right. It might be just a matter of losing seal or it might be something else.

Ear canals can be very different from person to person and even from ear to ear. What works for my funnel-shaped ears my be completely wrong for yours. You might need different sizes for each ear, even.

For whatever it's worth, with my ears and my IEMs, Comlpys and the Shure back olives have yielded the best results over time. They sound (and feel) a little different, with the black olives being bassier and punchier and the Complys being smoother, with a more articulate midrange. Moving the tips up and down the nozzle, or wearing them forwards or backwards or whatever seems to change the sound somewhat. So I'm quite ready to believe that the shape of the end of they tip (after being squashed in your ear) is important, even if you don't go so far as to squash it closed and block the nozzle.

Jazz Casual's picture

I came to headphones via earphones and have done my share of tip swapping. This didn't seem to affect the sound of the earphones. I used to frequent the portable and earphones threads at Head-Fi, and was bemused by the obsession with ear tips and some of the extraordinary claims that were made regarding how radically they changed the sound of earphones. I was sceptical as this hadn't been my experience. However, there was an occasion when I changed a foam tip for a silicone tip and the latter altered the sound of the earphone significantly, and not for the better to my ears. Consequently, I'm not as dismissive of these claims now.

Callie87's picture

I came to this website right about time, right now I am trying to chose perfect earphones and this was very curious for me to read, I hope that this post will help me to get my perfect ones! I just love listening to music while working with photo editor as I am a photographer, for me it is such an inspiration!

itsastickup's picture

I almost sent back my HF2's due to squelching and pain in my left ear.

It turned out to be ear wax build up. I'm actually relatively young, so I was a bit surprised. Any way it turns out that this is an issue for half my friends also. A lot of them have had their ears done, which I hadn't known about. I thought it was an issue only for the very old. Even Shures can given problems; and they aren't that deep. Etymotics should tell of this to avoid losing customers.

I had my ears syringed and -> Audio bliss. It also cleared up a long-standing pain that sometimes affected me when sleeping with my ear on the pillow. And when I swim my ears clear immediately whereas before it could take some time.

Since then a friend recommended an ear bulb that has done the job, without the need of the medics, when the issue reoccurred. Here's a link for that:

http://www.amazon.co.uk/Hand-Bulb-Ear-Syringes-85/dp/B000LX4L4M/ref=sr_1...

I use a thermometer to make sure the water is at a safe temperature (38C) to avoid burning my eardrum.

Stochos's picture

Comply foam tips are not durable and there are many varieties of foam tips that may be used.

Earsoft also made by 3M are cheap; much cheaper than Comply and can be easily made to fit almost any IEM.

More details here:

http://www.head-fi.org/t/169789/homemade-foam-ear-tips-for-iems

julian67's picture

Hi Tyll

thanks for the article, it's great to see someone applying reasoned enquiry to a neglected but quite common aspect of IEM ownership and use.

Before I read your article I was convinced that Comply (or similar compliant foam tips) do reduce resonance. With my Shure SE215 or Sennheiser CX95 IEMs I don't notice much sound difference between foam, triple/double flange and regular silicones, but with my Klipsch Image X1 IEMs I remain absolutely sure that Comply tips improve things a lot by reducing the awful leaden booming. The two immediately obvious differences between the Klipsch and the others are that the Klipsch bass is both more emphasised and more resonant (booming/muddled) and that the Klipsch silicone tips are *a lot* harder than the Sennheiser or Shure equivalents.

I have no experience of Etymotic, Audeo or Monster 'phones or tips so I don't know if I'm saying anything relevant or pertinent or simply recycling unfounded impressions.

The one thing about foam tips that I do know beyond a doubt is different is how well they negate bone conduction. I often listen while out walking and if I use foam tips I hear the music, but if I use silicone tips I hear the music overlayed with the thudding footsteps of a 16 stone lead footed ogre. I prefer foam tips.

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