HiFi Boy OS V3

Average User Rating:
  1. Moonstar
    "HiFi BOY, the New BOY in the Town"
    Pros - Built Quality
    Great Fit and Comfort
    Good Amount of Detail and Balanced Sound Signature
    Nice Stock Cable
    Cons - Missing some sort of silicone & foam eartips
    HiFi BOY, the New BOY in the Town



    My special thanks to Penon Audio and HiFi BOY.

    The HiFi BOY OS V3 IEM was provided to me for free of charge by Penon Audio as a review sample. I am not affiliated with Penon Audio or HiFi BOY beyond this review and these words reflect my true, unaltered, but subjective (I am a Human) opinions about the product.

    About HiFi BOY:

    HiFi BOY is a high-end hifi audio brand launched in China by Chengdu Fallante Technology Co., Ltd. The company is mainly engaged in manufacturing, sales and development of hi-fi headphones, multimedia speakers and bluetooth audio equipments.

    The brand CEO, Mr.Chen combined with a number of acoustic engineers a team to make HiFi BOY to a cost-effective HiFi brand.

    Official Website of HiFi BOY (click)

    The Price:
    The HiFi BOY OS V3 can be purchased on Penon Audio for 199 USD.

    Purchase Link

    Package and Accessories:

    The HiFi BOY OS V3 comes in a black chard box that has the silver HiFi BOY logo printed at the top of this box. The box contains the following accessories;

    ● 1 pair of HiFi BOY OS V3 In Ear Monitors
    ● 4 braided Silver Plated Copper (SPC) cable with MMCX connectors
    ● 3 pairs of silicone ear tips (small, medium, large)
    ● 3.5mm Female to 6.5mm Male Adapter
    ● Flight adapter
    ● 1 pcs. of HiFi BOY branded carrying case


    The HiFi BOY branded carrying case is bigger then regular zipper cases and can store all in the package included accessories.



    My HiFi BOY OS V3 came with a 4 braided Silver Plated Copper (SPC) cable that has MMCX connector, but HiFi BOY made an update and the OS V3 will now be sold only with 2 pin connectors.


    The cable is transparent and looks pretty good. The cables is right angled and has a rhodium plated 3.5mm SE jack that looks and feels sturdy.


    The cable itself has no microphonics and the memory wire is made of a transparent shrink tube coating that is comfy.


    Design and Build Quality:

    The HiFi BOY OSV3 is an In Ear Monitor (IEM) that is made of a resin based shell. My unit is in black color and has a beautiful shiny appearance. HiFi BOY offers the OS V3 also in Blue and Red colors. The OS V3 is handmade but it has a great build quality without any noticeable flaws (burrs etc.) and looks rock solid.


    It has to bores on the nozzle, one for the dynamic driver (bass) and the other for the 2 balanced drivers (mid & treble).


    It has also one bass vent on each monitor at the sides.


    Fit, Comfort and Isolation:

    The HiFi BOY OS V3 is has a custom like molding that can be called semicustom like InEar made with the StageDiver Series before. The OS V3 has a very good fit and seal due this semicustom like housing and I had no comfort issues while wearing it for many hours (with pausing every 20min. I don’t expect a Custom IEM (CIEM) like isolation form the OS V3, but I think that it has a very good isolation for a Universal IEM (UIEM).


    Technical Specifications:

    • Drivers: 2 Balanced Armature + 1 Dynamic Driver (Ultra-high frequency Balanced Armature + high frequency Balanced Armature + 7mm strong magnetic composite diaphragm Dynamic Driver)
    • Impedance: 19 Ohm
    • Sensitivity: 109 Db
    • Frequency response: 20Hz-20KHz
    • Cable Length: 1.2 m
    • Plug: 3.5mm rhodium-plated
    • Wire: 5N single crystal copper silver-plated cable


    Drivability (Impedance):

    The HiFi BOY OS V3 is easy to drive and a quite sensitive IEM with an impedance of 19 Ohm. The OS V3 is ideal for all type of portable Digital Audio Players (DAP’s) and even my Samsung Galaxy S8 and IPad Air 2 could push the HiFi BOY to very high volumes without any noticeable struggling.


    Albums & tracks used for this review:

    • Emmanuel Pahud (Claude Debussy) – Syrinx (Apple Music)
    • Melody Gardot – Who Will Comfort Me (Flac 16bit/44kHz)
    • Aretha Franklin – I Say a Little Prayer (Apple Music)
    • Diana Krall - So Wonderful (DSF)
    • The Police – Every Breath You Take (Flac 16bit/44kHz)
    • Queen – Greatest Hits Vol. II (Apple Music)
    • Otto Liebert & Luna Negra – Up Close “Album” (DSF) – Binaural Recording
    • Alboran Trio’s – Cinque Lunghissimi Minuti (Tidal Hi-Fi)
    • Megadeth – Sweating Bullets (Flac 16bit/44kHz)
    • Lazarus A.D. – The Onslaught (ALAC)
    • Opeth – Damnation (Tidal Hi-Fi)
    • Metallica - The Black Album (Flac 24bit/96Hz)
    • Daft Punk – Get Lucky (Flac 24bit/192kHz)
    • Twenty One Pilots – Fairly Local (Tidal Hi-Fi)
    • Michael Jackson - Billie Jean (DSF)

    In Ear Monitor : HiFi BOY OS V3 (Whizzer A15 Pro and Rose Cappuccino MK2 for compare)

    DAP/DAC : Aune M2 Pro, Chord Mojo, Zishan Z2, Ipad Air2, Samsung Galaxy S8 Plus


    Sound Analysis and Comparisons:

    This HiFi BOY OS V3 review is written by me after an intensive burn-in process of 100 hours. I have used the stock provided silicone ear tips due this review.

    HiFi BOY Sound Grapic.jpg

    Sound Signature and Tonality:

    HiFi BOY OS V3 can be classified as an IEM with a V-shaped sound signature. The lows and the treble frequencies have more weight in comparison to the slightly but not too much recessed midrange. The OS V3 sounds warmer than neutral in almost every track I have listened with it so far.

    This frequency range can show some variations depending on the paired up source. For example; the HiFi BOY OS V3 sounds softer, warmer and more musical with sources like the Chord Mojo or the IPad Air 2. The Aune M2 Pro in the other hand sounded more balanced and effortless while the Zishan Z2 had a thinner and brighter presentation.

    Lows (Sub Bass and Bass):

    The low end presentation of the HiFi BOY OS V3 has this typical character of a hybrid IEM with deep impact and nice rumble that is produced by a relative small 7mm diameter dynamic driver.

    The sub bass quantity is well done, has great texture and is not overpowered in its general sound presentation. You can feel the sense of power that comes from this region, but as mentioned before, the sub bass quantity that is reproduced from the single dynamic driver (the 2 BA drivers are for treble and mid presentation) is not on a bass-head level. The sub bass representation of instruments like kick/bass drums, bass guitars and electronic synthesizers are great.

    For example the song of “Twenty One Pilots – Fairly Local”; the sub bass right at the beginning of the track has a nice wow effect, the impact and rumble is quite impressive.

    The bass notes have more presence than the sub bass in the lower frequency region. The bass reproduction of the HiFi BOY OS V3 is giving a nice solid layer to the sound with good rumble. The good thing about the OS V3 bass presentation is, that there's not too much bass emphasis to be found unless the track is asking for.

    For Example the legendary song of the group “The Police - Every Breath You Take” is one of my favorites when it comes to analyze a bass guitar presentation. The HiFi BOY OS V3 excels very well in this area by presenting a smooth and tasty bass rhythm.

    The company HiFi BOY did a good job by tuning the lows of OS V3 relative balanced and not too dominant. Thanks to this choice, the HiFi BOY OS V3 didn’t sounded boomy or muffled while listening to some bass intensive and complex tracks.

    Mids (Lower midrange – Midrange – Upper midrange):

    The HiFi BOY OS V3 is not a mid forward IEM and has a V shaped midrange.

    First of all, nice to hear that the bass doesn’t bleed in to the lower midrange, that could otherwise result a hollow and muffled presentation. The lower midrange of the HiFi BOY OS V3 is adding only a touch of warmth to the mids that is a welcome for some lower-stringed instruments like acoustic or electro guitars etc.

    Acoustic guitar passages in “Otto Liebert & Luna Negra’s” song “The River” sounds lifelike and delightful.

    The midrange provides a nice engaging and balanced sound that is not too analytical or warm for my taste. Both male and female vocals sounding relative realistic and emotional, but I think that female voices sounded more delightful to me. The voice of Diana Krall in her song “So Wonderful” sounds lush and emotional.

    The HiFi BOY OS V3 is maybe not the most detailed IEM in my collection, but I can easily say that the detail retrieval of the midrange is quite impressive for a 200 USD IEM.

    There is a small roll-off in the upper midrange area that is not to overdone. This is a good thing to avoid sibilance & harshness and is a good tuning, if you are listening music for long hours like me. This tuning also avoids an upper midrange stress that is normally common for hybrid IEM’s and it reminds me to this of the AZLA-01R; very relaxed.

    Highs (Treble – Upper treble):

    The treble presentation of the HiFi BOY OS V3 is coherent and very balanced. The clarity level and definition around 5K is great. The treble of the OS V3 is in general not too upfront, but that doesn’t mean that its sounds grainy or too dry, in contrast; it sounds natural and relaxing.

    Instruments like Cymbal, Piano or Violin sounding quite realistic and have a nice sparkle.

    For example; the big cymbals in Megadeth’s legendary song “Sweating Bullets; seconds 0:11, 0:14 and 0:21; the bells sounding realistic and have great transition without loosing any control, that’s a really great capability for this price point.

    The top ends of the HiFi BOY OS V3 has enough air & brilliance, and is luckily not over boosted that would accentuate hiss or cause ear fatigue after long listening periods.

    For example; the upper treble extension of the OS V3 in Emmanuel Pahud’s (Claude Debussy) – Syrinx side flute (transverse flute) performance is satisfying and quite realistic.

    The treble presentation of the HiFi BOY OS V3 has impressed me due the review and I think that it is a great performer for a 200 USD priced IEM.

    Soundstage and Imaging:

    The soundstage of the HiFi BOY OS V3 is not monstrous or claustrophobic it sounds quite realistic. It has more depth than width and there is enough space and air between the instruments that makes it possible to locate each ones position, even in complex passages.

    Some Comparisons:

    Vs. Whizzer A15 Pro (125 USD):

    The Whizzer is a fantastic IEM for its price, especially the build quality accessories and detail level it provides makes it to a no brainer.

    The first comparison comes to the fit. The HiFi BOY OS V3 has the better fit and ergonomics due the semicustom design. The OS V3 is also lighter than the A15 Pro that makes it a better choice if you are listening music for long hours. The build quality on both is great, but the Whizzer A15 Pro has a metal shell vs. the resin based shell of the OS V3. The package and accessories that comes with the Whizzer is a lot more an on a higher level compared to the prices that they ask for.

    When we compare it for the sound, I can say that these two IEMs have not too much together. The A15Pro sounds more analytical and bright in comparison to the OS V3, which has an overall warmer sound signature. The detail level of both is in a similar level, the OS V3 has a little more micro detail then the A15 Pro.

    The Vocal presentation of both is great for the price they are asking for. The bass response of the OS V3 especially at the bass and lower midrange is better tuned and has more presence. The Whizzer A15 Pro is missing some bass that makes it not to a real all-rounder. When it comes to soundstage and imagine, both are quite capable in its own way. The A15 Pro has a wider soundstage while the OS V3 wins in the depth.

    The OS V3 is a good all-rounder with perfect fit, while the Whizzer A15 Pro is more suitable for those who prefer a brighter and more analytical presentation.

    Purchase Link for Whizzer A15 Pro

    Vs. MEE audio Pinnacle P1 (200 USD)

    The MEE audio Pinnacle P1 is a very capable IEM for the price. It has a very good accessory package, great build quality and a great looking stock cable. The fit of the Pinnacle P1 is great as the OS V3 and but the OS V3 is bit more comfortable. The isolation of the OS V3 is better due the semicustom design. The sound signature of the Pinnacle P1 is very similar to the Whizzer A15 Pro that I have mentioned above, but it has more bass weight that makes it more balanced. The P1 sounds brighter, thinner and has more sparkle at the top end. The OS V3 on the other hand has a more balanced coherent sound signature than the P1. The P1 sounds a bit thin and dry at the midrange and there is also missing some bass weight and warmth that is not suitable for male vocals and instruments that needs thicker notes. The Pinnacle P1 sound a bit more airy and spacious. Both IEM’s have similar good soundstage presentations. The OS V3 has a deeper stage while the P1 has a slightly wider presentation.

    Both IEMs are great performers in the 200 USD price categories, but the HiFi BOY OS V3 is the better all-rounder for me.

    Purchase Link for MEE audio Pinnacle P1

    Vs. Rose Cappuccino MK2 switch ON (350 USD):

    The Rose Cappuccino MK2 is one of my favorites IEM compared to the price. It has a wonderful stylish and comfy housing with two sound signature options, ON for a more reference and balanced sound and OFF for more bass emphasis, ideal for genres like Pop, Edm etc.

    I will compare it with the HiFi BOY OS V3 in switch ON position cause for the more reference type song.

    Both are small, handmade and nice looking IEM’s, the MK2 has the upper hand for customization, because you have a wide variety of color and faceplate design options. Both are comfy hand have a good seal. The Rose Cappuccino MK2’s build quality is good, but the HiFi BOY OS V3 looks more solid and better crafted in direct comparison. The Rose Cappuccino MK2 has also a V shaped sound signature but with even more prominent top end lower end. The bass of the MK2 goes lower has more rumble and has a better definition. The HiFi BOY on the other hand has a more balanced reference like bass tuning that is one of the best in the 200 USD price league. The midrange of the HiFi BOY is more in foreground and the vocal presentation feels more intimate as those of the MK2. The Rose Cappuccino has more boosts in the treble range, has more sparkle and sounds vivid, while HiFi Boy decided to make an IEM with a more overall balance. Both have an airy presentation and similarities for soundstage. The soundstage of the MK2 sounds similar in the width while the OS V3 has little more depth.

    Both IEM’s sounding great in its own way regardless of the price. If you pay attention to price and for a more balanced sound go for the Hifi BOY OS V3, but if you have more money to spend and want two different sound signatures the Rose Cappuccino MK2 could be a good choice.

    Purchase Link for Rose Cappuccino MK2



    The HiFi BOY OS V3 is a nice looking semicustom like IEM with great built quality, nice stock cable and a great sound performance for the price. Nice to see new brands like HiFi BOY that makes such great products for a relative reasonable price.

    Pros and Cons:

    + Built Quality
    + Great Fit and Comfort
    + Good Amount of Detail and Balanced Sound Signature
    + Nice Stock Cable

    - Would prefer some more sort of silicone/foam eartips
  2. audio123
    "HiFi Boy OS V3 - Triple Hybrid Attack"
    Pros - Sweet Female Vocals, Treble Flair, Great Build
    Cons - More eartips selection

    HiFi Boy is a new Chinese company that started not too long ago. They produced the HiFi Boy OS V3 as their first in-ear monitor. It has a popular driver configuration – 2 Balanced Armature and 1 Dynamic. I would like to thank Penon Audio and HiFi Boy for this review unit. At the moment, you can purchase the HiFi Boy OS V3 from https://penonaudio.com/HiFi-BOY-OS-V3 .



    • Drivers: 2 Balanced Armature & 1 Dynamic Driver (Ultra-high frequency Balanced Armature + high frequency Balanced Armature + 7mm strong magnetic composite diaphragm Dynamic Driver )
    • Impedance: 19 Ohm
    • Sensitivity: 109 dB
    • Frequency response 20Hz-20KHz
    Unboxing & Accessories

    The HiFi Boy OS V3 comes in a matte black package that has the HiFi Boy logo printed at the front. After opening the package, there is a HiFi Boy carrying case with the brand name printed on it, gold-plated headphone adapter and a flight adapter. Inside the carrying case, you get eartips and the iem itself.




    IEM Build & Design

    The OS V3 has a glossy black surface to its faceplate and shell. On the faceplate, there is HiFi Boy logo printed on it in silver colour. The shell is made out of plastic. The iem is not heavy at all. There is a vent at the side of the iem shell. The nozzle is angled with 2 bores. There are no L & R markings on the iem to differentiate between left and right.





    Cable Build & Design

    The cable is 4 core braided and it is made of silver plated copper. It uses mmcx connectors with a transparent housing. On the mmcx connectors, there are L & R markings to differentiate between left and right respectively There is a memory wire area section in which the cable is enclosed in a transparent heat shrink tube. However, it is still very flexible. The chin slider and y-splitter has a transparent housing. Lastly, the jack is 3.5mm rhodium plated right angled. It has strain relief and a transparent housing.


    Sound Analysis


    The OS V3 has a well extended sub-bass with a quick rumble. The mid-bass is engaging with a nice slam and dynamics is being boosted. The extra punch provided by it accentuates the overall bass. Bass texture is rather smooth and it operates in a clean approach. The decay is rather quick and on the point. Each bass note is presented with a clean and precise hit. I find the bass to be very engaging. There is a good combination of texture and speed which results in a harmonious presentation. The transition from the lows to the lower mids is rather effortless.


    The midrange on the OS V3 is slightly v shaped and you will not get the thick and lush mids. Instead, it operates on the clean and transparent approach. The lower mids on the OS V3 does not have a lot of quantity and there is no hollowness in male vocals. The upper mids are slightly forward and there is no veil at all. Female vocals are sweet sounding. Overall definition on the midrange is good with details being presented. There is an energetic feel to it.


    The treble is extended greatly and there is body to it. Although it does not have a lot of body, there is still weight in its presentation. There is no sibilance and harshness. The lack of grain makes the treble soothing to listen to. Air rendered has a good amount of quantity and the presentation is not very heavy sounding. Crisp has a good definition and there is no congestion in the sound. There is a high level of details retrieval.


    The OS V3 has a natural expansion in its width to reduce congestion. Positioning of vocals and instruments is accurate and there is good separation. The depth is not close in with a good amount of space at the front. I feel the soundstage on the OS V3 is great.



    HiFi Boy OS V3 vs iBasso IT03

    The OS V3 has less sub-bass quantity and extension than the IT03. The sub-bass reproduction from the IT03 packs both quantity and extension. OS V3 has a good sub-bass but just cannot catch up with the IT03. The mid-bass on both is fairly similar and there is a good slam. Bass texture on the OS V3 is slightly more smooth and there is mastery on both. Decay on the IT03 is slightly quicker with a faster rumble that improve the dynamics and engagement. The bass note on the IT03 is presented with more finesse and the bass from the IT03 is on a higher level than the OS V3. In terms of lower mids, the OS V3 has slightly more body and male vocals are being expressed with more thickness without sounding hollow. For the upper mids, the IT03 appears to have an edge with more forwardness and female vocals benefit from it. In the treble section, OS V3 has more control and the mastery is shown. The energy from the IT03 is more existent. There is no sibilance and harshness on both. In terms of soundstage, the IT03 has the better width while the depth of the OS V3 has more space as it is not too close in. Vocals and instruments positioning is better on the IT03. Resolution of IT03 is better.

    HiFi Boy OS V3 vs Oriolus Forsteni

    The OS V3 has more sub-bass than the Forsteni and the extension is as deep as the Forsteni. The Forsteni hits slightly harder and there is more impact. Mid-bass on the OS V3 has a heavier weight and there is a better slam. On the Forsteni, it is more clean and clinical. Decay on both is very similar and a quick rumble is being expressed. The texture of bass is smoother on the OS V3. Moving on to the lower mids, there is more body on the OS V3 and it does male vocals justice. On the other hand, the Forsteni does not express male vocals as well as the OS V3 since quantity is lacking. For the upper mids, the Forsteni has more forwardness and crisp. Female vocals sound particularly well here. Treble articulation is more accurate on the Forsteni. Details retrieval on both is similar. Both operates in a rather similar approach. For soundstage, they have similar width and depth. Layering and separation is approximately the same. Resolution is at the same level.

    HiFi Boy OS V3 vs Campfire Audio Dorado

    The Dorado has more sub-bass quantity than the OS V3 but there is more extension on the OS V3. There is more bass definition in the Dorado bass reproduction. Mid-bass on the Dorado has more slam due to more weight. The mid-bass presents itself in an authoritative manner. Bass texture on the OS V3 is more smooth. The level of finesse on the Dorado is more matured but I feel OS V3 is a more engaging listen due to its fun approach. The lower mids of the Dorado is thicker while for the upper mids, there is more intimacy on the OS V3. OS V3 has an organic feel to its top end. In terms of soundstage, the OS V3 has a good width with a natural expansion. There is more depth in the Dorado. Vocals and instruments positioning on the Dorado is more accurate. Resolution of Dorado wins slightly.


    The HiFi Boy OS V3 marks HiFi Boy debut in iems. It provides an alluring bright sound that has treble flair. Female vocals are portrayed in a sweet manner with a good level of details retrieval. There is good build quality on the OS V3 and excellent fit. Overall, the OS V3 is nothing short of impressive for a company’s debut iem.


    For more reviews, visit https://audio123blog.wordpress.com/ .
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