Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
All
Ra-c (21.5)
reviews

Manufacturer details
- Back Cavity: Acacia Wood
- Shell: Aluminum Alloy
- Front Cavity: Advanced Ceramics
- Driver Configuration: 8 mm AMT Tweeter + 16 mm Dynamic Driver
- Frequency Response: 10 Hz – 45 kHz
- Impedance: 180 Ω
- Sensitivity: 93 dB
- Cable: Pure Silver + Gold-Plated Silver + OCC Copper conductors; Detachable plugs (3.5 mm single-ended, 2.5 mm balanced, 4.4 mm balanced)
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
- oBravo utilizes a hybrid driver configuration, combining a dynamic driver for lower frequencies with a specialized Air Motion Transformer tweeter for enhanced high-frequency performance.
- They are known for crafting their IEM and headphone housings from premium and often unusual materials such as brass, ceramic, wood, and copper, selected for their acoustic properties and aesthetic appeal.
- oBravo's products often feature a semi-open design that aims to provide a more spacious and speaker-like listening experience compared to traditional closed-back IEMs and headphones.
- They engineer and patent their own proprietary AMT drivers, including the AMT II, continuously striving to improve the performance and efficiency of their unique tweeter technology.
Select products
CUPID (ULTIMATE)
- Positioning: The entry-level earphone designed for affordability and portability.
- Description: Features a unique Planar Magnetic Driver that brings clear, bright highs and engaging mids in a simple package. Compared to the Air Motion Transformer models, it offers dynamic sound at a lower price point, ideal for users who seek portable performance without the complexity of higher-end builds.
EAMT-2C
- Positioning: A mid-range earphone focused on miniaturization and balanced full-range performance.
- Description: Features exclusive miniaturization and Air Motion Transformer technology that delivers rich spatial sound and precise bass clarity. When compared to the simpler CUPID (ULTIMATE) and the more refined EAMT-1C, it offers a balanced mix of performance and cost‐efficiency for everyday critical listening.
EAMT-1C
- Positioning: A higher mid-range earphone tailored for audiophile-quality listening on the go.
- Description: Features refined Air Motion Transformer tweeter and single crystal oxygen-free copper cable that enhance realism and warmth. Compared to the EAMT-2C, it provides a more engaging, full-bodied sound while still staying below the flagship models in terms of price and imaging sophistication.
RA-C (21.5)
- Positioning: A premium earphone model aimed at delivering lifelike spatial imaging and detailed sound.
- Description: Uses advanced materials like pure silver, gold-plated silver, and oxygen-free copper wiring that produce crisp highs, warm mids, and deep bass with precise spatial cues. In comparison to the lower-priced models, it offers superior audio balance and critical listening performance.
RA-C-CU (21.5)
- Positioning: The flagship earphone focused on the highest fidelity and premium build in the lineup.
- Description: Takes advanced material construction further by providing extremely nuanced imaging and groundbreaking sound clarity through refined use of high-grade conductors. When benchmarked against all other models, it delivers top-tier performance.
Our take on the brand
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Used
oBravo
What if you spend more?
What competes at this price?
Our Summary
Product Strengths
- Build quality is sensational, handmade in Taiwan, and has thousands of man hours put into it
- The kit has detachable clickable connections, and high-quality pure copper cables
- Comes with accessories such as replacement parts for the earbuds, and adapters (3.5, 4.4 for balance, and 2.5 balance)
- Accessories are beautifully made with wood and good hinges
- The product features a two-way speaker system inside an earbud
Product Considerations
- It demands good, abundant power to be driven, due to its specifications of 93dB sensitivity, and 182 Ohms
- Needs to be burned-in (driven) for no less than 200 hours, and most possibly 300 hours
- The stock cable has tiny connectors which make it very difficult to connect any wire beyond 26-28awg
- The outer packaging box seems to be a reformed cardboard box, which is huge and white, and may not be durable in the long run
- The proprietary MMCX-designed connectors means the cable’s tiny connectors make it very difficult to connect any wire beyond 26-28awg and perhaps a very thin 2 or 4 wire at best
Comparisons (according to reviewers)
- The oBravo RA-C-CU excels versus the Vision Ears EVE2020 across every parameter, though there is a warmth across the EVE’s midrange via its dynamic driver, that moves it to, at least, competitive with the RA-C-CU and its Neodymium Dynamic Driver
- There were no aspects between the Vision Ears ELYSIUM and the oBravo RA-C-CU where the oBravo did not excel
- The oBravo RA-C-CU extends a competitive advantage across all relevant parameters from bass extension to treble extension to transparency to a coherency that holds together through the most complex and dynamic passages to a more expansive soundstage, compared to the oBravo EAMT-2C
Takeaway: The Ra-c-cu (21.5) is a very well-made earbud that gives a sensational listening experience like high-end speakers in one's ears. If one wants to treat oneself with serious earbuds where money is not a problem, this is the way to go.
Video review
Our take on the brand
Our Summary
Product Strengths
- Considered by many as having the best sound achievable in an in-ear headphone, making it an exceptional audio experience
- The sound signature is mostly balanced with tasteful coloration, where the treble imparts a particular element that is potentially preferable
- The midrange is extremely well done
- Features unique SLAM subwoofer, woofer, midwoofer, mid tweeter, tweeter and EST technologies
- Built with Grade 5 titanium, providing sturdiness and high quality
Product Considerations
- Treble performance can be hit or miss depending on the listener's anatomy and HRTF
- Requires more power than typical IEMs, potentially draining the battery of portable audio players
- Shells are on the larger side
- The included cable is nice, but the chin cinch tends to slide down
Comparisons (according to reviewers)
- Compared to the Hi-Senior Megafest and Dusk Default DSP, the Storm is an editorialized or enhanced version of those IEMs, particularly regarding bass and mids
- Compared to the 64 Audio U6T, it has similar balance with similar tasteful colorations, but Storm's bass is more punchy and the upper treble is more to the reviewer's preference
- Compared to the Empire Ears Odin, the Storm is preferred because the Odin is not as versatile, and the Storm sounds more detailed
- Compared to the Empire Ears Raven, the Storm is more normal in a good way because the Raven has massive bass and a strange lower midrange resonance feature
- Resolution, stage and tonality are better on the Storm compared to Grand Maestro
Takeaway: The Storm is a high-end IEM with exceptional sound quality and great build, even if pricey. It could be worth buying for those who want the best possible audio experience and appreciate a balanced sound with unique features.
Video review
Our take on the brand
Our Summary
Product Strengths
- Fuller body smooth analog tonality and a neutrally balanced sound signature
- Naturally resolving treble
- Expanded soundstage
- Beautiful, exotic material shells and premium leather accessories
- Very light weight
Product Considerations
- The high price is a significant consideration
- Performance is source pair-up dependent
- The included PWA First Times Shielding Pro cable has some microphonics
- Shells are a little bigger in comparison to previous Mason FS models and MM/AP models from Mentor-series
Comparisons (according to reviewers)
- Vs Unique Melody Amber Pearl, the Soleil Tombé has less bass and is more neutral, allowing for clearer mids compared to the Amber Pearl's stronger bass presence
- Vs U12T, the Mason FS has better bass impact and texture, while the Mason FS also presents vocals as warmer and fuller, with more atmosphere, while the U12T presents a very clean and clear sound, though it is less energetic
- Vs Noble Onyx, the Mason FS is warmer, while the Onyx has a larger, more open sound, though the Onyx can be clearer in higher registers but loses clarity in lower registers compared to Mason FS
- Vs UM Mason FS Le Jardin (LJ), the 2024 model is just $499 more
Takeaway: The Mason FS Soleil Tombé is a very good-looking IEM that provides a unique listening experience with balanced sound and beautiful mids. It is for people that want something different than other products in the market.
Video review
Our take on the brand
Our Summary
Product Strengths
- The Traillii is the first pair of IEMs that makes the reviewer feel like listening to big headphones in almost all aspects
- The soundstage and imaging from the Traillii are considered to be world-class
- The Traillii has a very natural, coherent sound, and the transition is gapless and silky smooth from the bottom to the top
- The fit is fantastic and close to fitting like a custom IEM
Product Considerations
- The unboxing experience and included accessories are lackluster, especially considering the price
- The stock cable has questionable workmanship and is bulky and microphonic
- The Traillii’s treble response is disappointing and lacks incisiveness
- The Traillii is a bit more difficult to drive
Comparisons (according to reviewers)
- The Traillii sounds like the 64 Audio U12T, but has better timbre and a darker timbre
- The bass does not hit as hard as the Empire Ears Odin
- The Traillii sounds more balanced and neutral, with better resolution and a smoother connection between bass and treble, whereas Thummim is more bass-oriented and has a V-shaped sound signature
- The Traillii focuses more on stage, image, and overall coherence, while the Vision Ears Erlkonig focuses more on sound density and macro-dynamic focus
Takeaway: The Traillii offers a natural and coherent sound, with world-class soundstage and imaging, making it a great choice for those seeking a high-end listening experience in an IEM form factor. It is an all-rounder that is talented and gifted, which allows it to play almost anything off of any source/DAP and still sound good.
Video review
Our take on the brand
Our Summary
Video review
Our take on the brand
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