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Product Snapshot
🎧 Driver: 14.2mm Planar Magnetic
🔊 Sound: Fast, Punchy, High-Resolution
🎸 Tuning: Optimized for Rock & Metal
🛠️ Build: All-Metal Shells (5.4g each)
🔌 Cable: Graphene OCC Copper
🔄 Termination: Modular (3.5mm + 4.4mm)
🎚️ Eartips: Wide Bore + Narrow Bore
Description
ROSESELSA x AAV CJ20 Planar Magnetic IEM
14.2mm Planar Driver • Tuned for Rock & Metal
The ROSESELSA x AAV CJ20 is not just another planar IEM—it’s a purpose-built machine for rock and metal lovers. Co-tuned with Andy from Andy Audio Vault, the CJ20 combines a massive 14.2mm planar magnetic driver with precision tuning to deliver explosive energy, razor-sharp detail, and lightning-fast transients.
If your playlist is filled with distorted guitars, aggressive drums, and layered vocals—the CJ20 is engineered to bring that intensity to life.
⚡ Built for Rock & Metal Enthusiasts
Unlike generic tunings, the CJ20 is crafted specifically for rock and metal genres. It delivers:
- Tight, punchy bass that never muddies the mix
- Forward, energetic mids for guitars and vocals
- Crisp, extended treble for cymbals and micro-details
With dual ear tip options (wide bore & narrow bore), you can fine-tune the sound depending on your music style—whether you want more air or more body.
🔊 14.2mm Planar Magnetic Driver Performance
At the heart of the CJ20 lies a large 14.2mm planar magnetic driver, delivering:
- Ultra-fast transient response
- Exceptional detail retrieval
- Low distortion across the frequency range
- Clean, high-resolution sound signature
This results in a fast, punchy, and highly resolving presentation—perfect for complex, fast-paced tracks.
🧠 Co-Tuned by Andy Audio Vault
Backed by years of critical listening experience, Andy from Andy Audio Vault has carefully tuned the CJ20 to meet the demands of metalheads and audiophiles alike.
His signature tuning ensures:
- Accurate tonal balance
- Engaging, energetic sound
- Genre-specific optimization
🛠️ Premium All-Metal Build
The CJ20 features precision-crafted all-metal shells that are:
- Lightweight (just 5.4g per side)
- Durable and premium in-hand
- Designed to reduce internal resonance
This results in cleaner sound reproduction with improved clarity and control.
🔌 Graphene OCC Cable with Modular Plugs
Included with the CJ20 is a high-purity graphene-plated OCC single crystal copper cable, designed for superior signal transmission.
- Modular termination system
- Includes 3.5mm + 4.4mm plugs
- Low resistance for cleaner audio signal
This makes the CJ20 versatile for both portable and balanced audio setups.
Driver Type: Planar Magnetic (14.2mm)
Impedance: 24Ω ±10%
Sensitivity: 102 ±3dB
THD+N: ≤3% @1kHz
Frequency Response: 20Hz – 20kHz
Connector: 0.78mm 2-Pin
Termination: 3.5mm + 4.4mm
Warranty Period: 1 Year from the date of Invoice
Covered: Manufacturing Defects Only
Warranty Form: https://www.theaudiostore.in/pages/warranty-claim-form Cable: 1-month warranty only for manufacturing defects only
Established in 2012, Rose Technics is dedicated to delivering unparalleled sound through innovative technology and meticulous craftsmanship. Known globally for our timeless and elegant designs, we integrate advanced technologies to create unique audio products that seamlessly enhance everyday life.
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from 7471 reviews
The packaging was very good, properly sealed.
Sound quality: If you are balanced sound signature lover, you would love this earbuds, mids, highs, lows everything is very clear.
No sound distortion even in full volume.
Mic Quality is average and ANC is also average. My main priority was sound quality.
Built quality is also good.
If you are planning to buy your 1st IEM around 1k then you must go with this one no other options are valid against it. And Big thanks to Audio store for quick delivery.
its really good
I’ve been genuinely impressed with this IEM The sound signature feels well-balanced and refined, making it enjoyable across different genres. What stood out most to me is the controlled bass it has enough punch to keep the music engaging It stays tight and clean, which adds depth without sacrificing clarity
Just one cosmic issue which I had is the right shell's rubber has got yellowish I don't know the reason but it is yellowish since I unboxed
The Tanchjim Bunny is a lightweight, premium-looking upgrade cable that prioritizes portability and comfort.
Build: High-purity silver-plated copper with a soft, tangle-free texture.
Ergonomics: Excellent flexibility with zero "memory" (no kinks) and very low microphonics (cable noise).
Sound: Provides a clean, transparent signal with a subtle "perceived" boost in treble clarity.
Best For: Users who hate stiff cables and want a minimalist, comfortable aesthetic for daily commuting.
Verdict: A great buy if you want a "disappearing" cable experience, though the white finish requires extra care to keep clean.
This s my first iem. When i used it first i didnt like tht much . But aftr using this i used my tws i was really shocked to c the diff. Nw this is part of my daily wear.
Make sure to selct ear tip according to ur size. It s really importnt.
Pretty good
I am using it with TANGZU - Waner SG 2 - Red Lion Edition -Type C. I replaced my type C cable with this and now its the beat thing I have done, Obviously with a external DAC
What a great great experience.
Clean and fast bass, balanced mids and crisp highs, loved the bunny. Also, good mic quality.
comfortable to wear. clean, layerd , detailed sound.
This adds wireless convenience to IEMs. Paired it with KZ Castor Pro.
ANC : 3/5
it is an added plus but people using IEM do not usually care about ANC. The passive NC depends on the IEM itself.
Sound quality: 4.5/5
With LDAC support, works pretty good with supported devices. I even tried it with Iphone, works really good. Most normal people wont feel any difference over wired. Audiphiles may feel subtle loss of details. But thats what you compromise for convenience. Gain may seem a bit low compared to a DAC+IEM setup but 70-80% volume is sufficiently loud. The audio tone is neutral and balanced
Comfort: 4.5/5 As comfortable as the IEM itself. Gives a Open Wireless earphone feel in terms of comfort. I have wore it over 8-9 hours intermittently playing songs - didnt feel any bulk.
Case: 1/5 Extremely bulky. Forget about keeping in the pockets when you decide to buy this. But treat it like a IEM case. The feel is plasticky and not premium. The adapter themselves feel premium but not the case.
Battery: 4/5 Decent battery backup.Adapters themselves give around 5-6 hours playback at 70-80% volume.
Overall a worth purchase if you are looking for tws convenience with your IEM.
I never thought I'd ever buy an on-ear headphone considering the nature of these headphones sitting on the ears, but I was pleasantly surprised by how comfortable they are. The delivery was snappy, received way earlier than expected.
Sound wise I'd say these are great, very open and natural sounding with a flat profile but reacts well to EQ. These are not for Hip Hop listeners straight out of the box but the drivers can get boomy with bass boost. I use these with a DAC/Amp and if you are planning to buy them then you truly need one. I'd suggest to get a warm sounding DAC/Amp dongle to bring out the best in these and make them sound musical.
They look nice too. Go for it. But as expected they leak sound, so outdoor usage is not recommended, but if you want natural ambient sound while listening to music on a jog and hate in-ear earbuds then these are perfect.
Really appreciatethe quality of this product as it is really a premium quality product with a touch of nice red led ring light. I have paired this DAC with Moondrop chuu 2 IEM. The sound quality is phenomenal. Worth buying and in my opinion its a value for money.
Hi Team, great product , impeccable service, at reasonable cost. Thanks Audio Store.











