Periodic Audio Beryllium (Be)

General Information

Frequency Response
12 Hz to 45 kHz
32 Ohms nominal
100 dB SPL at 1mW in ear
Power Handling
20 mW continuous
Less that 1% THD at 1mW
Material Properties
Melting Point
1560 Kelvin
Speed of Sound
12890 meters per second
Young's Modulus
287 Gigapascals
Brinell Hardness
1320 Megapascals

Latest reviews

Pros: After 2 weeks run-in: Coherent, detailed, near-magical sound
Light and easy to wear all day
Keeps sounding better as your source and gear get better - anybody try these with a Chord M-Scaler and a DAVE?
Cons: Captive Cable
Cliff Notes Version
After a horrible start and a very long time in training, these “Be-came” so good that I purchased 2 Be. “Be-cause” I never wanted to Be without. I also gave away several other iems “Be- cause” I no longer needed or wanted to listen to them. I think the Periodic Audio Be are one of the greatest bargains in audio at $300. Very Highly Recommended.
The Be has a captive cable. I wish I could try my favorite cable with the Be, but cable swapping is not allowed. Maybe the next version of the Be will allow that.

Beryllium in speakers can really Be something very special. About 30 years ago, I heard beryllium as a tweeter in the Yamaha NS500 speakers. “Be-ing” a college student of modest means, I took extra yearbook photography assignments and at the end of the term, I took everything out of the piggy bank except the squeal and bought a pair. Yes, they were vapor deposition Be instead of solid Be foil, but my ears said they were the best sounding speakers that I could afford then and I voted for them with my paychecks and enjoyed them for years.

Today, several very well-regarded speakers for pro, home, and mobile use are blessed with beryllium tweeters. The Focal Solo 6be, Twin 6be, Trio 6be, Trio 11be, and SM9 are among the powered speakers that are generally well respected by the pro audio market. They cost between about $2,5k and $7k per pair. The Focal Utopia home series with beryllium tweeters tops out around $65k per pair. The Focal Utopia 6.5” separates car speakers are about $2k a pair. Then there are the very well-regarded Focal Utopia (open back $4k) and Stellia (closed back $3k) beryllium-based full-sized headphones. How could I resist risking $300 for some Be iems from Periodic Audio? Yes, I ordered them from Amazon and paid for them with my very own money.

Act 1: Hate
As soon as I extracted my new Be from the well-designed packaging, I plugged them into my iPad Pro to make sure they were working. There was sound coming from both channels. This was important. I noticed that the inside of one channel, visible down the hole in the center of the eartip was blue and the other channel was red. This was an elegant way to determine right and left channel, except for in two instances: in the dark, or if you prefer the Comply eartips with the wax screen that would cover the red or blue parts. One reviewer went on a rant about this. I just applied a very simple and inexpensive fix. Since the outside of each golden endcap is nicely engraved with the Company logo, I put a few coats of my wife’s chip resistant clear nail polish on the right channel’s end cap so it is smooth and the left one has the factory engraving. Now I can easily distinguish the right from the left in whatever conditions allow my fingers to feel. (I added the fire engine red metallic later on the right channel to color code the outside.)

Since the Be’s were basically functional, I started training them (I loathe the term “breaking in” as that implies either that some kind of crime is happening, and the cops should stop it, or that something destructive is happening. I prefer the term “training” as in “Train up an iem in the way it should go . . .”). Initial training material included Celtic Woman “A New Journey”, Burmester “Art for the Ear”, Berlin/von Karajan “Holst: The Planets”, Michael Card “Starkindler” and Rick Wakeman’s “Merlin”. All were “.wav” files playing on my iPod pro set to repeat all with the volume about a solid forte (volume slider between the pause/play indicator and the next track indicator).
Shortly thereafter, I nearly blew it. I know it’s not fair to listen critically after only 13 hours of training, but I couldn’t help myself. I rationalized that I should check the Be progress and target the remainder of the training for the problem areas (if any). So I stuck ‘em in my ears and plugged them into my Roon/Hugo2 and listened up.
Here There Be Bass - good, solid, detailed, layered, one of the three best jobs with Enya Watermark bass lines I have ever heard in iems or headphones with my Hugo2 (Jerry Harvey Layla 2 with Silver Dragon cable tops the iem chart for me, and the Fostex 900 with hard-wired Silver Dragon cable for full size headphones). I could tell that for the bass, the Be has the potential to Be something very special.

Then I made the mistake of trying a men’s acappella choral group. In just a few notes, I was hit with an intensely negative emotional experience, best summed up by JRR Tolkein’s Gollum screaming: “Nassty, NASSSTY SSIBILANCESSS! It hurts Us! It Hurts Us! We hates it! We HATES IT!”

I had to turn off the tunes to shut Gollum up so I could think. (Screeching like that is my worst sonic nightmare. Like several fingernails scraping several chalkboards, it stops further audio processing until it is silenced.) After rational thought returned, I decided that the Be really needed more midrange and treble training to try and make the upper mids and lower treble listenable. I remembered that the Grado 10e’s and RHA MA750’s had similar, but not as glaring, mid/treble issues, which were solved by 5 to 7 days continuous training. I put the Be’s on double secret probation and added sibilance torture tracks like MercyMe’s album “Welcome to the New” on the training playlist. That album actually sounds fantastic through my reference system, but several other systems and less refined iems and headphones can make it screech bigtime.

Act 2: Wait
Some people tell me that patience is a virtue. To which I usually reply “Yeah, right. I ain’t a doctor and I don’t need patience.” The iPad pro fed continuous music from the Training playlist to the Periodic Audio Be at a good solid forte level for another whole week. That’s 168 hours or half a fortnight. What Happened? I then went back to the Roon/Hugo2 rig and listened to my bass tests first:

Bass: Potential for excellence on both acoustic and electronic bass was shown using Major Mackerel’s “Conga Beat the Drum”, Dub Colussus’ “Dub Me Tender”, Kraftwerk “Radioactivity” and “Autobahn”, MercyMe “Welcome to the New” and “Greater,” Rick Wakeman’s “Merlin,” Mannheim Steamroller’s “Prelude/Chocolate Fudge”, Iona “Kells”, and Stephen Wiley’s “Glory to God” from DC Talk’s Yo Ho Ho CD. I say potential for excellence, because there was something about the decay and release of some bass motes that just did not sound quite right, but the bass attack, extension, and the body and layering of the bass notes and sostenuto was as near “spot on” as I have heard through any sub-$1,000 iem or headphone.

Mid/Treble: Much improved. Some sibilance remained, but at least the above tracks were listenable without cringing. Gollum’s screaming at me was gone. In general, the mids and treble were nowhere near as detailed, precise, coherent, involving, and attention-grabbing (in a good way) as the bass.

If you ever heard one of the ESS Heil or the Carver Amazing loudspeakers, this one-week-of-training sound was the exact opposite. The ESS folded motion transformer and the Carver ribbons made absolutely exquisite music for the midrange and treble, and both were paired with bass sections that sounded like elephants plodding through quicksand by comparison.

Conclusion: Continue Training for the second half of the fortnight. Support for this came from a few reviews on Head-Fi. One mentioned 200 hours and another said 250 hours were required. Note to Dan at Periodic Audio: Please emphasize that the Be really needs 10 to 14 days of continuous “Training” or “run-in” to unleash most of their potential. Listening too much before then could make you wish you never bought them.

Act 3: Love
When music is being played or replayed very well, there is an emotional response. Breathing slows, as if the noise from breathing will shatter the magic of the moment. Heart rate will be affected, racing or slowing as the music carries it along. This is not just getting the notes right. One of my favorite conductors said that getting the notes right does not mean you are making music, you are just not making noticeable mistakes. The bass, midrange, and treble all need to be there at the right time and in the right proportions to permit the possibility of making music. The attack, body, and release of the notes must be right. This elusive ethereal confluence is difficult to achieve through playback, and usually can be fouind only while soaking up the original live event in person.

336. The number of very slow hours in two weeks or one fortnight. The only audio equipment that I have heard of needing more training than that is the new Spectral mono amp – it gets 500 hours before leaving the factory.
I have really been enjoying about a month with my now fully trained Periodic Audio Be. Those bass tracks listed above found just about everything I think was missing. I place the Be third on my all-time bass list – behind the Astell&Kern/JH Audio Layla 2 with a Moon Audio Silver Dragon v3 cable and the Fostex 900 (original with Moon Audio Silver Dragon cable “hacked” in). And the Be does this at 1/5 to 1/10 the price.

The mids/treble testing included most of the now quite enjoyable MercyMe Welcome to the New album. This, of course, sounded best on the reference rig. Then Quincy Jones’ “Back on the Block” from Burmester’s Art for the Ear. When the female soloist, full jazz choir, and instruments get into a very complex passage, it takes a very good playback chain to handle it without smearing or losing something. At times it can sound sibilant, but it is not. (This was on a Burmester compilation CD that was produced to help sell Burmester systems costing upwards of $100k.) On this track, I realized that Be were the first two letters in “Beautiful” for good reason. With my suspicion confirmed by hearing Radka Toneff “The Moon is a Harsh Mistress” from Art for the Ear, and Celtic Woman’s “The Sky and the Dawn and the Sun”, “Newgrange”, “Caledonia”, and “Mo Ghile Mear” on their A New Journey CD, I thought the Be were ready for the final testing.

The Be passed my final “goosebump” tests with great delicacy, insight, and that elusive emotional response. Cecelia Bartoli’s “Exsultate Jubilate” from her Mozart Portraits CD at the right volume is absolutely captivating – especially for the last two minutes. It was all there, the orchestra, the hall ambience, Cecelia’s voice soaring and reverberating from the walls. I rarely hear this reproduced this well. Bria Skonberg’s “Trust in Me” was suitably mesmerizing. Kaa (Jungle Book) could not have done it better. And finally, Celtic Woman’s “Over the Rainbow” from A New Journey brings four female voices: Chloe, Orla, Meav, and Hayley, each a soloist in her own right, into a four-part harmony that just begs for absolute silence to hear the voices interplay with each other and the hall harmonics and to follow the melody weaving from one voice to the next. I suppose that I breathed during the 2:38 of that track, but I do not remember. Yes, I still preferred the Layla 2’s presentation, but the Be handily bested most of the other iem’s I have heard.

2 Be or not 2 Be? Yes. I purchased 2 Be. With my very own money. Be-cause I never wanted to Be without. I think the Periodic Audio Be are one of the greatest bargains in audio at $300. I saw on the Periodic Audio website their Be B-Stock sale, I grabbed one for $149 due to some microscopic cosmetic flaw that I may notice someday.

The Be sound better and better as the source tracks and playback equipment get better. The same “.wav” file sounds better on the iPad pro than the iPhone 6 plus. There is a bigger quality jump moving from the iPad pro to the Roon on Dell/Chord Hugo2 and the really good gets much better with the reference rig: Furman 15 dmi/MIT power cords/Melco/Silver Dragon USB with or without Audioquest Jitterbug/Chord Hugo2.

I try to keep 2 dynamic and 2 balanced armature iems for comparison purposes in reviews, and to have something to take with me – because the Sennheisers and the Laylas do not leave the house. My current Dynamic Duo are the Periodic Audio BE and the Sennheiser ie 800s. Gone are the Nuforce 700 and 800 series, Klipsch 6 ii, Focal Sphear, and RHA MA-750.

The Etymotic ER4s and Grado 10e did not fare well against the Be. Be put them on probation and the Massdrop/NuForce EDC3 iem with an aftermarket Moon Audio Silver Dragon v1 cable sent them away for good.

Room for Improvement
The Be has a captive cable. Please note that all 3 of my favorite headphones and both of my favorite balanced armature iems had the capability to swap cables and I installed my favorite Moon Audio Dragon (Black Dragon for the Utopias, and Silver Dragon for the NightOwls, Fostex 900’s, Astell&Kern/Jerry Harvey Layla 2’s and Massdrop/NuForce EDC3’s.)

I wish I could try my favorite cable with the Be, but cable swapping is not allowed. Maybe the next version of the Be will allow that. I have a sneaking suspicion that the Periodic Audio Be with a Moon Audio Silver Dragon would be a better all-around performer than the Sennheiser ie800s, at about half the cost, but we may never know.

Final Thoughts
If you are thinking of making a roughly $300 “Sound Investment” for in-ear monitors and do not mind waiting a few weeks for them to be trained properly, please put these on your very short audition list. I also recommend that on that very short list should be the Massdrop/NuForce EDC3 three Knowles balanced armature iems for $100 (for the drop I was in from with another $200 for a Moon Audio 2-pin iem silver dragon v1 cable for about $200 from The combination makes the decision between the EDC3+Silver Dragon and a stock Be very difficult. The two iems do different things. I believe that different people will choose differently, but many will find that a close match, even though they have different strengths and different sound signatures.

Short Summary: I think the Periodic Audio Be are one of the greatest bargains in audio at $300. Now I know why Be are the first two letters in Beautiful.

Shorter Summary: Berylli-Yum. Delicious sound.
I had just bought a pair for the "be" IEMs after reading your interview, I am so glad I found your in depth review especially the information regarding that the "training" was required. This will be more than helpful, and has saved me from agonizing over my purchase. And if anyone reads this post, Periodic Audio is having a Founders sale. Amazing prices for an amazing pieces of gear, I just happened stumble upon the website and bought the beryllium (perfect for me budget wise) and seemed like the best bang for the buck scenario. And, no, I am not connected to Periodic Audio, just became a fan in my search for the best for less IEM's. Can't wait to get them and give them a good run-in (fortnight), and then some incredible listening! Thanks again!
Pros: Excellent sound quality.
Cons: Small miscellaneous nuances that can be overlooked.
Hello all,
First time reviewer, long time lurker...

I would first like to disclose that I won these from a local headphone meet, where Periodic Audio could not attend, but generously donated three of their headphones for a raffle: their Magnesium (Mg), Titanium (Ti), and Beryllium (Be). I was lucky enough to have my name pulled for the Be.

My second disclosure is that I have never done a review of headphones, and have only seriously delved into this hobby for less than two years. I was very much into home theater ( as you can see in my personal DIY build thread, and have been into electrostatic and planar speakers for a decent amount of time. That segued into planar and electrostatic earspeakers, and hence my first headphone meet and ultimately these Berylliums.
Therefore, my review will probably be considered by many as a novice, so please keep it in mind when reading my thoughts.
The meet occurred back in November, and I said I would provide my thoughts shortly thereafter. Life has run away since then. To be honest, there has been much apprehension on my part for doing this review, as I am not comfortable with the verbiage and phrases of what I can hear. I just know what I like and what I don't.

There are multiple reviews of the Be headphones, with plenty of photos of the headphones and accessories (most of which look 10x better than I ever could take with my camera), so unfortunately this will only have words.

My first impression was to look at the bare-bones packaging. Great for the environment, simple, and to the point, which I appreciate. I'm not sure how much fanfare I need when opening up packaging when I know I'll probably never use it again (I felt the same about opening my first iPhone, counter to everyone else's thoughts about presentation... you'll never place your iPhone back in there, so packaging is not a big thing for me if it's not utilitarian). I do want to point out that a beautiful timepiece, with it's special box and presentation that would likely be used again and again to store is a different thing altogether (I'm big time into horology). This came with a nice gold circular tin storage container that I have found useful for storage. It already has dents and dings from being carried in my bag along with my keys and other paraphernalia, so I appreciate how this protects the headphones better than a soft bag. There was a plethora of ear inserts to fit literally any shaped ear, and I was lucky that the default ones fit me perfectly. The 1/4" adapter comes in handy when plugging into my home system. The double plug used in airplanes seemed out of place, as I haven't been on a plane with one of these inserts in many moons. I guess it's better to provide it and have me place it aside, than to not, so it's not a bad thing.

The cord is relatively thin and flimsy. I am not sure what should be expected in $300 buds, but these felt similar to the $10 ones I've bought from a number of brick and mortar stores. I haven't had any issues or concerns with being tough on them and breaking them the past 1/2 year, but they do give me pause over other brands I've owned which seemed to have more sturdy cords, and cost significantly less. I do have to say that the 5 year warranty does give me peace of mind that they will stand behind their product if it fails.

Immediately, I noticed the red color inside the headphone chamber as the light from the window hit it perfectly, as if it was spotlighting it. Initially, I thought it quite clever for them to do so, although in the past few months, I have found it more of a hindrance at night when I'm trying to listen to them in bed. I now realize that having a raised "R" on the outside of it, or some other indicator (like an inline mic, but that's another thing) would be more helpful than having it inside, as I now have to use my phone flashlight to identify it. Again, not a big deal, but something to point out.

I actually let everyone attending the meet try out the headphones first before I finally tried it. The consensus was that they are great sounding headphones. Not one member had any bad things to say about them, and to me, that was saying a whole lot about the sound quality of the Be.
Once I placed them in my ears and listened to them through my Chord Mojo, I was very impressed. Nice tight bass, and clear highs. I can understand how other reviewers say it has a V-shaped profile, as I noticed that as well. Now I don't know that much about breaking in headphones like you would with speakers, but I have to say that in the past 6 months, they seem to sound better to me than my initial impressions. As portable as they are, I find they are my default headphones when I'm not at home (the different Stax earspeakers I have are my go-to's when home). I do have a set of Stax SRM-002 that are also considered "portable", and the portable Stax sound better than the Be, but carrying around the Chord DAC, the Stax energizer, and the earspeakers and headband (detachable but I always use them) really aren't convenient nor truly portable. Using the Be with either the Mojo or Fiio E18, or even just my LG V20 with the Quad DAC is seriously all I really need to enjoy the beautiful tones and clarity in almost any setting. I've let family and friends try them out, and they are all amazed at the quality of sound coming from them.
When I listen to Diana Krall live, or jam to some of my favorite 80's songs, I have not found one song where these headphones have not excelled in sound quality. Cymbals and audience noise and footsteps are clear, where on other non electrostatic IEMs, I did not oftentimes notice they were there. Imaging and sound stage are pretty distinct and wide. I can close my eyes and feel immersed in the music and the environment. These are top-notch IEMs that I will continue to enjoy for years to come (and ones in which will not be passed down to my kids).

I hope this has been helpful, and I will try to be more technical in future reviews, as I learn the nomenclature and train my ears in this wonderful hobby we all share.
Actually, not going deep into "technical stuffs" doesn't mean a review lacks something. I've enjoyed your review. Thanks! :)
Pros: good bass and textures, exposed mids, excellent treble, good stage
Cons: cable is not detachable

Periodic Audio BE IEMs — a flagship model from a very ambitious American brand with people in white robes behind it. A product developed by engineers for the sake of audiphiles, three times more interesting to consider due to the country of origin. BE stands for beryllium which means 100% pure beryllium foil diaphragm used in a single dynamic driver in the essence of this model. Lots of other interesting features about BE IEMs can be found at the official Periodic Audio website. Our task is to express personal opinion about its build and sound quality while trying to compare the approach of tuning between Asian and American brands.

Periodic Audio BE technical specification:
    • Type: single dynamic driver IEMs
    • Diaphragm: 100% pure beryllium foil
    • Magnets: N48H
    • Frequency Response: 12Hz — 45kHz
    • Impedance: 32Ω
    • Sensitivity: 100dB SPL @ 1mW
    • Peak SPL: 123dB
    • Power handling: 200mW continuous
    • THD: <1% @ 1mW
    • Shell material: polycarbonate + Metal-Injected-Molded grade 304 stainless steel logo caps + chemically etched grade 316 stainless steel grilles
    • Cable: 1.5m, integrated, 3,5mm audio jack

Packaging, design and build quality:

Periodic Audio BE are nicely packed into a well designed box which has IEM structure printed on the front side and product specifications at the back. The unfolding part reveal the additional information — highly demanded visual graphs of the frequency response range.

Box contains a paper holder with special openings that retain gold color storage case and IEMs while all the rest of accessories are stored inside the case.

Couple of words about the quality of the box and storage case — yes, those do raise some questions for a person who got used to extremely good quality of packaging of IEMs from Chineese and Korean manufacturers. As far as I know, people from Periodic Audio do care much more about the resulting sound and build quality of IEMs instead of focusing on the additional accessories. The main quality question addresses pretty thin aluminum storage case that doesn’t have secure locking mechanism and won’t last long. On the other hand — the rest of the accessories look perfectly well, box is not that visually attractive but does the job of protecting the product during the transportation. Let’s say that we see two different approaches: either to provide visually attractive packaging to move the stock despite sound characteristics or to put an accent on the quality of sound which is the most important for IEMs.

Box contents:
    • Periodic audio BE IEMs
    • Storage case
    • 6 pairs of silicone eartips
    • 2 pairs of memory foam eartips
    • 3.5mm -> 6.6mm adapter
    • 3.5mm -> 2 X 3.5mm L+R plane adapter
Box contents surprises with the plane and 6.6mm adaptors. Never thought that people would use $300 IEMs in planes instead of the 1cent options that are provided by the crew.

Anyway, it was a joke. I know that there are some DAPs that are equipped with such kind of outputs. Rarely, but still… Good variety of eartips makes it possible to ensure a proper fit for any ear. Brand claims that eartips are made of medical grade silicone and uretanes that should secure you from any allergic reactions.

Caps with brand logo are made of 304 stainless steel.

Shells are made of polycarbonate for zero resonance and extra strength to resist mechanical damages. All shell elements are perfectly aligned and neatly assembled with very small spacing between parts.

Cable is 1.5 meter long, covered with black silicone and ending with 3.5mm straight plug in rubber housing.

Unfortunately, cable is integrated. It does have good bending protection from IEM side and looks pretty durable in overall to live long and happy life. But I would still recommend to pay a little bit more attention to its well being in comparison to IEMs where you can exchange the cable at your own will.


BE IEMs are quite comfortable, thanks to low weight (only 9.3g for both) and wide variety of provided eartips. Fit is secure and tight, no tendency to fall out while walking or exercising. Pretty good and common feel for IEMs with bullet-like shape.

Sound quality:

BE IEMs were tested with Hidizs AP80 DAP.

Lows and midbass:

Smooth and texutred lows are one of the main virtues of BE IEMs. Bass is disctinct, perfectly contoured with deep reach and impressive extension. Presence of bass is not overemhasized or underpowered — enough to create balanced perception of the sound in overall and perfectly exposed to reproduce micro detail and draw the attention towards it. Layering with other frequencies is decent, lows are not overlapping with mids and not shadowing any instruments no matter which volume you are at. Adequate bass reaction and speed keeps the sound complete. In overall, lows feel quite open, wide and extended. I cannot say that BE are dedicated for bassheads as the lows are kind of accurate and weighted intead of being too accented and heavy.

Midbass is vivid, energetical and engaging. Drums sound natural and rich. No influence is spotted from the treble part which results in accurate and non distructive sound in some tracks susceptible to excessive drum gain.

Mids and vocals:

First impression was that mids are recessed, sound distant and thin — common for V-shape tuning. Couple of tracks later, after getting used to the sound of BE, came the understanding that mids are adequately exposed and don’t tend to overly bright or dark tonality. Appropriate thickness and even delivery in this range make BE IEMs quite comfortable for different kinds of genres and long listening sessions. Voices sound natural and rich, no harsh peaks or artificially added emotions spotted on female vocals. Although, male voices do have a little bit of mellow feel while female’s do sound a bit more vivid. But this doesn’t grow into negative perception. Furthermore, most of the resolving potential is gathered in this range influencing string and bow instruments at the first place, followed by vocals. Amount of details is not so great as reproduced by BA drivers but definitely impressive for the single dynamic unit.


BE treble is astonishing: clear, transparent and very detailed. Treble crispness and clarity together with delicate delivery reminds of the best examples of balanced armature IEMs. BE is by far the best dynamic model regrading treble range, overall feel transparency and treble extension. This is also highlighted by the additional accent on this range that makes the sound less neutral but more fun and appealing to a listener.


Imaginary soundstage is more than average in terms of depth and width. Very good layering and instrument separation helps to keep perfectly distinctive sound for all instruments with no mixing between them. Precise instrument positioning and clarity defines the stage depth while transparent treble and open sound of bass adds some width.

Sound in overall:

Periodic audio BE sound can be described as slightly V-shaped, with open and textured bass, resolved and weighted mids, bright, crisp and accurate treble. Despite slight but apparent V-shaped tuning, BE still sound good with many different music genres. Rare combination of fun sound with such omnivorous nature.

Compared to Earnine EN2J:

Earnine EN2J (from South Korea) are based on 2 BA units tuned for very neutral sound with decent resolution. While BE sound brighter and more engaging, EN2J are like being very «flat» in the direct comparison. Lows are more extended and having more weight in BE while treble is similarly rich and bright. Overall resolution is slightly higher in EN2J due to the overwhelming microdynamics of high quality BA units but bass texturing is not that great. In terms of fit BE are lighter and more comfortable but EN2J have another good feature — exchangeable cable.

Compared to Tanchjim Oxygen:

Tanchjim Oxygen are my favorite single dynamic IEMs with neutral sound, great balance and perfectly delivered ranges. BE are directly comparable, having similarly good resolution, more exposed lows and better extension of treble. I would say that main difference in sound is that Oxygen IEMs are more neutral whereas BE are more vivid at both ends. The other sound characteristics are quite similar. Fit is much better with BE.


My very first take on IEMs originating from USA turned to an invention of a brand that definitely know how good the sound of single dynamic driver should be. Moreover, Periodic Audio has managed to implement this knowledge in their flagship BE IEMs. Its sound impresses with accurate bass, great layering, crisp treble and engaging but very comfortable picture in overall. Build quality is nothing more to be desired as well. The approach towards the good sound in different parts of the world is not that huge but obvious — egineers in Periodic Audio prevail over marketing that often invest only to the attractive facias… Soundwise, haven’t met other models with such interesting and successfull combination of the engaging V-tuning and adequate delivery of mids. At my own scale, BE would place somewhere at top, next to my most favorite models.

Another conclusion — «Chi-Fi» is not relevant and kind of rudiment funny word. Having lots of IEMs from different parts of the world (and now from USA as well) I can make a conclusion that there are best products with the best sound quality that originate from different countries. And many good examples from China. It is just the huge amount of less than average or mere quality IEMs from China that would confuse the choice. Periodic Audio, on its turn, deserves the ovations for making IEMs with excellent sound quailty at the very competitive price point when compared to best products from Asian markets with significantly lower material and labor cost. Something had to be sacrificed but definitely not the sound quality.

You can buy Periodic Audio BE IEMs at official store
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