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Description 
Ra Volution (Platinum)
Platinum Edition AMT Flagship Earphones
A rare union of platinum craftsmanship and oBravo’s AMT-8II micro-tweeter with a
16 mm neodymium dynamic driver. Hand-built, numbered, and tuned for connoisseurs.
Complimentary insured shipping • Concierge aftercare • Limited, numbered run
Why AMT changes what you hear
Air Motion Transformers move air laterally through folded pleats — like microscopic bellows.
This geometry achieves remarkable transient speed and low distortion. In Ra Volution, our AMT-8II
is mounted coaxially with a powerful dynamic driver, so cymbals shimmer, strings breathe, and
the soundstage opens beyond the ear.
- Coaxial hybrid: 8 mm AMT-8II tweeter + 16 mm neodymium driver.
- Semi-open architecture: speaker-like staging with effortless air.
- Precision chambering: smooth hand-off from mids to treble.
Platinum. Purposefully.
Chosen for its density, stability, and enduring luster, platinum forms an exceptionally inert
housing that supports micro-detail retrieval and a serenely black background. Each set arrives with a
lacquered display chest, travel case, balanced & single-ended terminations, and a concierge welcome.
- Individually serialized with certificate of authenticity
- Premium cable set (3.5 mm SE, 2.5 mm & 4.4 mm balanced)
- oBravo-format MMCX adapters included
Specifications
- Frequency response: 10 Hz – 45 kHz
- Impedance: 180 Ω (desktop-capable source recommended)
- Sensitivity: ~93 dB @ 1 kHz
- Drivers: 16 mm neodymium dynamic + 8 mm AMT-8II (coaxial)
- Design: Semi-open, platinum housing, ceramic front chamber
- Terminations: 3.5 mm SE, 2.5 mm & 4.4 mm balanced (included)
- Accessories: Display chest, travel case, tips kit, certificate
Ra Volution vs Ra C-Cu
Shared DNA
AMT-8II + 16 mm NDD hybrid, semi-open architecture, reference-grade staging.
Platinum Advantage
Denser, highly stable housing for superb finish and resonance control; numbered, collectible build; concierge ownership.
All-in Accessories
Balanced & SE terminations in-box, adapters for broader cable compatibility, upgraded casework.
FAQs
Will my player drive Ra Volution?
With 180 Ω impedance and ~93 dB sensitivity, we recommend a high-quality DAP with robust output or a desktop-class DAC/amp for best results.
Is it open or closed?
Semi-open for speaker-like staging. Expect reduced isolation compared to fully closed IEMs.
What’s included?
Numbered earphones, premium cable set (3.5/2.5/4.4), oBravo-format adapters, display chest, travel case, tips kit, certificate, and concierge contact.
Pre-order the Platinum Edition
Extremely limited initial release. Secure your number below.
Complimentary insured shipping • 14-day audition window • Priority aftercare
Additional information
| Weight | 2 kg |
|---|---|
| Brand | oBravo |
| Country | Taiwan |
| Technology | |
| Enclosure Material | |
| Driver Count | 2 |
| Driver Configuration | 1 AMTII + 1 Neodymium Dynamic |
| AMT Tweeter Size | 8mm |
| Dynamic Driver Size | |
| Colour | |
| Audio Range | |
| Sensitivity | 93dB |
| Impedance | 182Ohm |
| Google Product Name | OBRAVO Ra Volution |
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