ddHiFi Memory 4.4 Planar Universal IEMs | AL4.4 / Pd4.4

With an Upgrade of ddHiFi's Memory IEM, Choose Between Aluminum and Palladium-Plated Copper Housing

Aviation-Grade Aluminum or Pure Copper Housing with Palladium Plating
Features Revolutionary 13mm Planar Magnetic Driver
Ultra-Slim and Compact Body for Easy Transport
Includes Retro Carrying Case
4.4mm Plug 


AL4.4 vs Pd 4.4
The housing material and weight of an IEM are critical factors that directly influence both wearing comfort and acoustic performance.
Memory AL4.4Crafted from lightweight aviation-grade aluminum alloy, it offers an stress-free fit that minimizes ear fatigue, making it perfect for daily commutes and extended listening sessions. With multiple sizes of silicone ear tips, you can easily customize the seal and fit for a personalized blend of comfort and utility.
Memory Pd4.4Featuring a precision-machined pure copper housing with meticulously controlled wall thickness, this version provides a substantial, steady feel and superior passive noise isolation. Finished with premium palladium plating for a luxurious and durable texture, it strikes the perfect balance between sound quality, stability, and a high-end aesthetic.
High-Fidelity Sound with Effortless Comfort
Delicate details of high-resolution music are perfectly restored, while the ultra-slim and compact body defines the unique charm of Memory 4.4. Despite its lightweight profile, it delivers solid low-frequency depth and transparent high-resolution performance. Small in size, yet powerful in sound.

Co-Developed Excellence: ddHiFi x Moondrop
The Moondrop 13mm planar driver utilizes a sophisticated double-suspension structure and a high-performance four-magnet array, achieving an electro-acoustic conversion efficiency four times that of similarly sized dynamic drivers.
By significantly reducing the non-linear distortion of typical planar drivers, this advanced engineering allows for an expansive and powerful dynamic range even with low-power input, while maintaining exceptionally clear, low-distortion performance during high-intensity output.
Audiophile-Grade Tuning
Unlike the USB version, the Memory 4.4 has undergone a complete acoustic overhaul. The position and surface area of the front and rear chamber vents have been entirely redesigned. Paired with a custom-shielded cable and a dedicated plug, it offers broader source compatibility and focuses on the purest high-fidelity music playback.