Previously known as sub30
Pros: Highly portable bullet-type design (tiniest shell I currently have)
Warm-neutral (shallow fit) to Neutral-going-Midcentric (deep fit) signature
Useful mic + the functions
Simplicity and coherence with the single Knowles BA
Cons: Sub-par SQ for the price (lacks resolution)
Limited extension on both ends
Price is not competitive at 80 USD
Long-usage comfort issues when worn in my preferred style (for better SQ)

I would like to thank Lypertek for providing a review unit of the Bevi 2. Rest assured that my impressions written in this review are my own personal thoughts and opinions and in no way influenced by outside parties.

I am not an expert in this hobby nor claim to be an audiophile. I just love listening to music and am fond of writing articles.


Lypertek is an audio company that focuses on TWS. They started becoming famous due to their Tevi, which showcased “reference” tuning akin to one of the reference-tuned giants of the audio world. While they have produced wired IEMs in the past, it never acquired hype status unlike their TWs's. We have here the Bevi 2, an update from the original Bevi, now using a single Knowles RAF-32873 and upgraded with an MMCX connection. Impedance is rated at 33 ohms with a sensitivity of 110 dB. SRP is 79 USD.


These were plugged to my Oppo Reno 4/Asus X409 with the Earstudio HUD100 MK2 (bypass, high power) for the review. I have to note that it needs power as with a weaker source, there is literally zero bass and note weight is nonexistent.

Build and Comfort:
Design, while nothing special, is practical and efficient. Being a single-BA with not needing any ventilation, Lypertek seemed like they put a literal protective case to the Knowles BA. It’s that tiny. Shell is made of metal with an MMCX connection that looks like would survive everyday commute and abuse. I do have to note that a really deep insertion is necessary as this provides improvements on overall clarity and extension on both ends. To achieve this, I wear the Bevi 2 cable-up, pulling the back of my ear, with my mouth open, and inserting the IEM really deep (read: like a part of the shell itself feels like it’s in your ear canal deep/the whole ear tip is deep in the canal). I do have to note that my ears feel invaded with this wearing style and is liberated every time I remove them. Also worth mentioning is that I have small ear canals so comfort will be case-by-case.

Nozzle is 3mm in diameter with regular length.

Cable is nothing special. In fact, other than the metal jack, mic and splitter, it’s generic feeling and highly microphonic. Mic is very functional and is of high quality.

Isolation is above average due to the ventless design and deep insertion.

Package: 4 pairs of black silicone tips (XS/S/M/L). 3 pairs of foam tips (S/M/L). Paperwork. 4-core MMCX cable with mic. Hard carrying case


Now, onto sound:

For this review, the IEM was left in stock mode without mods, using the XS silicone tips with a low-medium to medium listening volume. This was what I preferred as I achieved a more secure and deeper fit, improvements in bass response/extension and overall clarity. Foam tips, while provided even more isolation, relaxed the treble even more, resulting in a warmer-to-muddy signature.

This is an IEM you can turn the volume up because there is no prominent elevation that will sound over-the-top/shouty at higher volumes.


Highly dependent on insertion depth. With a shallower fit, it will result in a warm sounding, slower bass response which further influences the succeeding regions. With a deeper one, I got a cleaner bass response. It has a slight elevation which brings forth engagement to the sound. Attack and decay are fast, typical of a BA and is right up my alley. Extension is limited and doesn't reach sub-bass. Texture, because of the bass quality, is reproduced remarkably.

Midrange: Neutral and intimate sounding. Midrange sits centerstage due to the insertion depth. This is the star of the show right here. Nothing sounds offensive. There is no part of this region that lacks body, is recessed, or sounds hollow. Because of the intimate presentation, and the upper midrange elevation in level with the lower treble, midrange is very natural sounding. Listening to acoustic/vocal-centric tracks is a treat with the Bevi 2. However, it does start to get boring due to the lack of transparency and resolution considering the price.

Treble: A slight elevation in lower treble which is very welcome and badly needed but not enough to fix it. There is a noticeable lack of air/extension from treble proper to the air frequencies which is also one of the culprits of the narrow soundstage and lack of resolution. Highs aren’t sharp without any pierce whatsoever. If the lower treble is a problem, it can be easily solved with the use of foam tips, though I don’t recommend this as it kills more of the treble, which is detrimental in my views. No instances of splash observed.


BA timbre is not present. It is very natural sounding though is more on the cooler side of things.

Soundstage, Imaging, and Separation: The deeper insertion results in better soundstage depth and layering with more precise and sharper imaging compared to a shallower fit. This doesn’t mean that the two aspects (imaging and layering) are excellent – they went from unacceptable (shallow fit) to below average (deep fit) for 80 USD. However, with said insertion, soundstage width greatly suffers and the staging is very, very in your head (read: narrow). Separation is sufficient considering that it’s a single-BA but fails when things start to get complex, earlier than I can tolerate (read: it can’t play any Yosi Horikawa or multi-instrument tracks starting at ~4 instruments, excluding vocals). Keep things simple with the Bevi 2.

Detail-retrieval: Nope. Look elsewhere. This is arguably the least detailed and resolving IEM I’ve listened to, regardless of price. I attribute this to driver limitation. Even macrodetail is rare to be perceived.




The Lypertek Bevi 2 is a neutralish IEM currently selling for 79 USD. Build is nothing exceptional, and while the form factor is amazing for my preferences, it will not be for everyone as to achieve the “best” SQ, you gotta jam it in real deep.

****If you have other questions/concerns with the IEM mentioned, feel free to message me****​
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CK Moustache

100+ Head-Fier
Link to my review and measurement index thread where one can also find a full review overview, more information about myself as well as my general-ish audio and review manifesto:

I only give full stars. My ranking/scoring system does not necessarily follow the norm and is about as follows:

5 stars: The product is very good and received the "highly recommended" award from me.

4 stars: The product is very good and received the "recommended" award from me.

3 stars: The product is good/very good, but not outstanding/special enough to get any of my two awards. ["Thumbs Up"]

2 stars: The product is only about average or even somewhat below that and somewhat flawed/flawed in some areas. [neither "Thumbs Up" nor "Thumbs Down"]

1 star: The product is bad/severely flawed to outright bad. ["Thumbs Down"]



Review sample.


Fairly minimalistic unboxing experience but at least a carrying case, silicone ear tips, foam ear tips and a Velcro cable tie are included in the small cardboard box.

The carrying case offers a more than sufficient amount of internal space for the in-ears but doesn’t appear especially premium compared to other cases of similar style; at least it’s fully functional (i.e. protective) and much better than a pouch/bag.

Replaceable cable with MMCX connectors. Due to where they are located and as they rotate freely, this could be a potential weak point.
Very nice cable with four twisted conductors and proper strain relief at the 3.5 mm plug (but none at the ear pieces). Appears premium and is very supple and flexible.
Three button remote/microphone unit located on the left hand side (sufficient position even with the cables worn around the ears). Ultimately not as nice as that of my Apple EarPods, but definitely one of the better ones. Unfortunately the volume control buttons don’t work properly on my Apple iPod Nano 7G and Apple USB-C to Headphone Jack Adapter (A2155) (but strangely with my Apple iPhone 4, but not with my BlackBerry Classic), which is something that I already encountered on my HiFiMan RE400i.
Has got a built-in chin-slider.

Very small ear pieces that are made of metal. Deep and easy fit possible. The design is neither boring nor special and rather generic.
Can be worn with the cables straight down or around the ears.

One BA driver per side.


Largest included silicone ear tips.


Warm, smooth and inoffensive.

Compared to in-ears with a rather diffuse-field flat approach to bass, such as the Etymotic ER4SR, the BEVI 2 have a boost of around 7 dB in the lows, which equals to about 4 dB stronger quantity in relation to in-ears such as the Ultimate Ears Reference Monitors or InEar ProPhile 8.
That boost starts to climb around 800 Hz and reaches its highest quantity around 75 Hz, with an already full lower root.
Very nicely, extension into the sub-bass is excellent and the level doesn’t drop a bit even at 20 Hz.
The lows’ boost also affects the lower midrange a bit as it is somewhat more on the warmer side of what be neutral, however there are no real masking effects and there is no bleed as the fundamental range boost is still gentle enough – I’d describe the lows as warm but not overly coloured, and far from unnatural.

The central midrange at 1 kHz is neutral and sounds natural, with a gentle tilt towards warmth for which the fundamental range lift and a mild recession at 2 kHz, in the presence range, are responsible, wherefore the upper mids are not exhausting but ultimately a bit more on the relaxed to slightly darker side which fits the general tuning quite well.

Level is back around neutral in quantity again around 3 kHz, just to decrease a bit towards 5 kHz, with a slight, broad lift being audible around 7 kHz and 8 kHz when performing sine sweeps, which adds a bit of a compensation for the warmth but without ever adding any brightness to the sound since it never shows when listening to music as the highs are generally perceived as being inoffensive and smoothly even; even rather somewhat soft. As the area around 9 kHz and 10 kHz, which is the one that is highly responsible for how cymbals’ impact and brightness is perceived, is on the more relaxed side again as well, these instruments and overtones are generally presented smoothly inoffensive as well while not subdued.
Super treble extension, while somewhat in the background, is good up to around 16 kHz wherefore the general bandwidth and extension is really good.

As a result, the sound is presented in a nicely smooth way, with a noticeable but mild enough bass boost that is not bothering, wherefore the BEVI 2 also seem like nice alternatives to the comparably smoothly-dark tuned EARNiNE EN210, Akoustyx R-210 and Shure SE215m+SPE but with a comparatively milder, less forward bass elevation, and a bassier presentation compared to the Etymotic ER3XR but at the same time milder, more relaxed presence range.
It’s just an easy to like, warmth-oriented, smooth tuning that does nothing wrong.

Frequency Response:


ProPhile 8-Compensation


Generally good/impeccable and definitely adequate for single-BA in-ears in this price range but nothing that’s particularly outstanding; one could also say “flawlessly average”. The BEVI 2 just don’t do anything really wrong, but they certainly don’t really excel either when it comes to technical perception.

Typically for nearly all single-BA in-ears, the drivers appear coherent.

The bass is typically tight for BA implementations and outperforms most single dynamid driver in-ears when it comes to speed and tightness, however it is not the fastest single-BA sound and the LYPERTEK ultimately don’t sound as fast and tight as Etymotic’s bass-boosted single-BA models, the FiiO FA1 or Akoustyx R-210.
While there is ultimately a slight amount of softening and reduced differentiation noticeable towards the very low bass when the track is quite demanding, general details in the lows are good, and that bit of slightly more softness compared to the tightest single-BA models gives the BEVI 2 a slightly more dynamic-driver like character in the lows while the decay and control are thankfully still at single-BA levels.

Speech integibility is generally good but ultimately the transparency lacks a bit behind due to some mild masking effects that a tuning like this usually brings.

In the treble, the transient response appears rather soft and could use a bit more definition.
While this character fits generally well to the tuning and also makes harsh, overly bright songs pleasant, the separation in the high notes starts to become somewhat blurrier than one may desire in fast, busy and complex parts of the music; perhaps not to the point of a lot of smearing, but still definitely not as clean as it could be.

Ultimately, the BEVI 2s’ strong point is really their tuning, with the technical performance being just average without any glaring faults, which also applies to the soundstage’s technical reproduction.


Quite typically for this type of tuning from single-BA in-ears, the perceived soundstage is neither particularly large nor really congested and fairly “normal”/”average” in size, with perceptively just a bit more spatial width than depth to my ears wherefore it is ultimately more on the oval side.
As such, it sounds authentic to me.

The imaging is generally realistic but could be ultimately a bit more precise, since there is definitely some noticeable blur between and around single instruments in busier, faster and spatially densely arranged recordings, which is a characteristic that was already audible in the BEVI 2s’ highs.

- - - - - - - - - - - -


Brainwavz B150:

Both feature a comparable bass tuning but the LYPERTEK are more linear when it comes to sub-bass extension whereas the B150 are a little more midbass-oriented (not to be confused with rolled off), with a very slightly stronger boost here and generally very slightly more warmth.
Otherwise, they are tuned pretty much identically and are generally very similar except for the small differences in the lows.

When it comes to resolution, they are generally quite on the same level.
Compared directly side by side, the BEVI 2 appear a bit tighter and faster in the lows, whereas the B150 offer the slightly higher midrange transparency and perceived resolution in this area.
In the highs, the B150 appear a bit cleaner and more direct compared to the BEVI 2 that present those in a softer way, although I would also say that the Brainwavz are ultimately probably a bit more detailed there as well.

In terms of soundstage, the BEVI 2s’ is slightly wider, with the slightly higher imaging precision (the B150 have just a bit more blur around and between tonal elements).

Akoustyx R-210:

Tuning-wise, both are heading into a very similar direction, with an almost identical midrange and middle treble response.
Where they differ audibly, though, is the bass and fundamental range that are more present on the Akoustyx that therefore sound bassier and warmer, as well as the upper highs that are tuned darker, more relaxed on the LYPERTEK, whereas they are a tad above neutral on the R-210, however not bright either and just add a little of compensation for their stronger, warmer bass presentation. Nevertheless, the R-210 have therefore got a bit more welcome “freshness” in the upper highs in comparison.

Interestingly, the R-210 have got the tighter, faster bass despite featuring the stronger boost in the lows whereas the BEVI 2 appear to portray a little more details there while the Akoustyx’ bass sounds a bit “blunt” in comparison.
When it comes to midrange transparency and resolution, the R-210 are somewhat ahead, though, which also applies to the treble presentation that is cleaner and more to the point on them whereas it is softer on the BEVI 2.

As for soundstage, width is comparable, with the Akoustyx featuring a bit more perceived depth.
Imaging precision is higher on the R-210.

Etymotic ER3XR:

The BEVI 2 are generally bassier, punchier and warmer tuned, and have a more relaxed upper midrange/presence range presentation. Otherwise, their treble response is rather comparable, with the ER3XRs’ ultimately sounding more linear and authentic, though, in direct comparison.

Put side to side, the ER3XR appear generally more transparent and cleaner sounding while the BEVI 2 have a softer presentation, which applies to all frequencies – while the control is comparable, the LYPERTEK IEMs present a softer, more body-oriented bass that is somewhat slower, too; the midrange is not all that dissimilar but as the ER3XR suffer from less masking effects in the lower mids/upper fundamental range in comparison, they definitely sound cleaner and more transparent here as well; the BEVI 2 present higher notes audibly more spread and softer.

In terms of size and dimensions, both in-ears’ soundstage presentation is fairly similar to my ears; imaging precision is sharper and cleaner on the Etymotic.


Highly likeable, smooth and inoffensive tuning.
While the technical performance is adequate and flawlessly average for single-BA in-ears in this price range, it could be ultimately better, though, compared to the single-BA competition.