Premium Planar In-Ear Monitors Inspired by Classic Audio Design
The Memory Pd4.4 is a flagship planar magnetic in-ear monitor developed through the collaboration between ddHiFi and MOONDROP. Combining vintage-inspired aesthetics with advanced acoustic engineering, these earphones deliver exceptional sound quality, refined craftsmanship, and long-lasting comfort for demanding audiophiles and music enthusiasts.
Designed around a next-generation 13mm annular planar driver and housed in a precision-machined pure copper shell with a premium palladium finish, the Memory Pd4.4 offers an immersive listening experience with outstanding clarity, dynamics, and tonal balance.
Precision-Machined Pure Copper Housing
The Memory Pd4.4 features a meticulously crafted pure copper housing manufactured with strict wall-thickness control to optimize both acoustic performance and structural integrity.
The substantial copper construction provides excellent passive noise isolation while minimizing unwanted resonance. A luxurious palladium-plated finish enhances durability, resists wear, and gives the earphones a sophisticated premium appearance.
The result is a design that combines elegant aesthetics, superior comfort, and exceptional acoustic stability.
Revolutionary 13mm Annular Planar Driver
At the heart of the Memory Pd4.4 is an innovative 13mm ultra-linear full-range annular planar magnetic driver.
This advanced driver utilizes a sophisticated dual-suspension architecture and a powerful four-magnet array, dramatically increasing electro-acoustic conversion efficiency compared to conventional dynamic and planar drivers of similar size.
The optimized design significantly reduces nonlinear distortion while delivering remarkable responsiveness, extended frequency reproduction, and impressive dynamic range, even when powered by portable audio sources.
Professional Audiophile-Grade Acoustic Tuning
Unlike the USB version, the Memory Pd4.4 has undergone a complete acoustic redesign specifically for high-fidelity audio playback.
The front and rear acoustic chamber venting system has been carefully re-engineered to achieve a more balanced frequency response and improved tonal accuracy. Combined with a dedicated shielded cable and balanced 4.4mm termination, the earphones provide excellent compatibility with premium digital audio players, DACs, and headphone amplifiers.
This meticulous tuning delivers a natural, transparent, and highly engaging listening experience across all music genres.
Detailed Sound with Powerful Dynamics
The Memory Pd4.4 reproduces music with exceptional precision and realism.
Low frequencies are deep, controlled, and impactful without overwhelming the mix. The midrange remains clean, rich, and expressive, allowing vocals and instruments to sound lifelike and natural. High frequencies are extended and highly detailed while maintaining smoothness and listening comfort.
Its spacious soundstage and accurate imaging create an immersive presentation that reveals subtle nuances in high-resolution recordings.
Despite its compact form factor, the Memory Pd4.4 delivers a remarkably large and powerful sound signature.
A Modern Interpretation of Retro Audio Culture
Classic audio products remain memorable because of their timeless design language. The Memory Pd4.4 embraces this heritage while incorporating modern materials, advanced manufacturing techniques, and cutting-edge acoustic technology.
Rather than simply recreating a vintage product, ddHiFi and MOONDROP have reimagined retro audio aesthetics for today's audiophile audience, creating a unique blend of nostalgia and innovation.
Premium Retro-Inspired Carrying Case
Included with the earphones is a stylish storage case inspired by the iconic shape of classic cassette players.
Constructed from premium microfiber leather and equipped with a high-quality YKK zipper, the case offers excellent protection during travel and storage.
Dedicated internal compartments keep the left and right earpieces separated, helping prevent scratches, scuffs, and unnecessary wear.
In the box:
- Memory Pd4.4 Planar In-Ear Monitors,
- ST35 Silicone Eartips (Size S, Pre-installed) × 1 Pair,
- CZ120B Retro Storage Case,
- KIWIFLEX Silicone Eartips (Sizes S/M/L) × 3 Pairs,
- User Manual.
