DD ddHiFi Memory 4.4 Planar In Ear Monitors

Enjoy 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.

AL4.4 vs. Pd4.4: Which is Your Ideal Match?

The housing material and weight of an IEM are critical factors that directly influence both wearing comfort and acoustic performance.

Memory AL4.4:

Crafted from lightweight aviation-grade aluminum alloy, it offers a stress-free fit that minimizes ear fatigue, making it perfect for daily commutes and extended listening sessions. With multiple sizes of silicone eartips, you can easily customize the seal and fit for a personalized blend of comfort and utility.

Memory Pd4.4: 

Featuring 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.

The Memory 4.4 features a revolutionary 13mm ultra-linear, full-range annular planar unit. 

This 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 and ten times that of conventional 14.5mm planar units. By significantly reducing the non-linear distortion typical of 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.

Professional 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.

Memory – A Fusion of Retro and Classic 

The reason early-generation products are fondly remembered lies in their timeless designs. However, reinterpreting "retro" in the modern era is more than just making a replica. By combining high-precision machining, professional grade drivers, enhanced ergonomics, and durable materials, we have re-envisioned a classic for a new age.

Included Retro Carrying Case 

Inspired by the form factor of classic cassette players, this case blends vintage design language with modern trend colors. Crafted from premium microfiber leather and equipped with YKK zippers, the interior features dedicated compartments to keep the left and right metal earpieces separated, preventing scratches and wear from contact.

Included in the Package

• Memory Earphones: 1 Set
• S-size ST35 Eartips (Pre-installed) - 1 Pair
• CZ120B Black Storage Case: 1 Piece
• Additional Eartips* : 3 Pairs (1 Pair each of S/M/L sizes)
• Manual, Warranty Card, Certificate of Compliance: 1 Copy Each

Specifications

• Driver Configuration: 13mm Planar Driver
• Plug: 4.4mm Balanced Plug
• Effective FR.: 20Hz - 20kHz 
• Impedance: 16Ω±15% (@1kHz)
• Sensitivity: 121dB/Vrms (@1kHz)
• THD: ≤0.1% (@1kHz)
• Housing (AL4 Ver.): CNC Machined AL6063 Aviation Aluminum Alloy
• Housing (Pd4 Ver.): Palladium-Plated Pure Copper Housing
• Cable (AL4 Ver.): Gray Braided 5N OCC Cable
• Cable (Pd4 Ver.): Black Braided 6N OCC Cable
• Weight (AL4 Ver.): Approx. 25g
• Weight (Pd4 Ver.): Approx. 31g
• Cable Length: 120cm
• AL4 Weight: About 25g
• Pd4 Weight: About 31g
• Cable Length: 120cm