Binary EP321 MEMS 2DD + 3BA + 1 MEMS Driver IEMs

*The curve is measured by a third party and is for reference only.

⚠️ Friendly Note

This product may include one or more of the following driver types: Electrostatic driver, Ceramic piezoelectric driver, Bone conduction transducer .

While enjoying your audio, you might occasionally notice a gentle electrical hum or a soft hiss . This is normal for these types of drivers and does not affect performance.

💡 About EP321 MEMS Driver 👇

The EP321 is equipped with an ultra-compact MEMS tweeter unit, with a package size of only 15.4mm³, which may be the smallest MEMS speaker unit in the audio industry today. Based on PZT thin-film piezoelectric technology, the diaphragm and driving structure are integrated and fabricated entirely using MEMS processes. In terms of acoustic performance, it offers excellent high-frequency extension and can easily extend beyond 40kHz, delivering an exceptional sound quality experience that meets Hi-Res certification standards.

To achieve the required sound pressure level (SPL) technical specifications, existing piezoelectric MEMS speaker solutions on the market currently need an additional dedicated PA chip to maintain a high drive voltage. The new MEMS unit on the EP321 can easily achieve SPL≥100dB @ 6kHz~40kHz with just a 1Vrms drive voltage, meaning it can deliver high-fidelity treble audio directly using existing headphone driving equipment without PA amplification, significantly lowering the application threshold for new MEMS speaker technologies.

Benefiting from excellent MEMS structural design and semiconductor process capabilities, it has outstanding response speed and consistency in sound pressure level (±1dB) and phase (±1°). Unlike similar products in the audio industry that use surface mount and wire bonding packaging schemes, it adopts AAC's specially developed "quasi-flip-chip" packaging process, achieving high reliability while ensuring high performance and ultra-compact package size.

Features:-

>World’s First Direct Drive MEMS Hybrid IEMs.

>Six-Driver Tribrid Setup Each Side.

>Dual Dynamic Drivers(1 Active+1 Passive).

>Three Balanced Armature Drivers.

>One Direct Drive MEMS Driver Unit.

>Professionally Designed Three-Way Frequency Crossover Design.

>Strong Details, Rich Tonality, Engaging Sound Profile.

>Exciting Design With Stainless Steel Face Panels.

>Face Panels have Irregular Geometric Elements.

>High-Precision 3D Printed Ear Cavity.

>Easily Swappable Detachable Cable.