40mm On-Ear Headphone

• Retro Open-Back Design
• 40mm High-Damping Dynamic Driver
• Warm and Fatigue-Free Tuning
• Ergonomic Telescopic Headband
• Multi-Axis Swivel Hinges
• 0.78mm 2-Pin Interchangeable Cable
• Modular Detachable Earcup System
• DF-HRTF Aligned Frequency Response

A Tribute to the Golden Era of Portable Audio
Since the Walkman era, open-back on-ear headphones have become cultural icons—symbols of portability, personality, and pure musical enjoyment. Decades later, the design still holds a special place among audio enthusiasts. Following the success of the DiscDream series, MOONDROP set out to create a retro-inspired on-ear headphone that revives this classic form while achieving true modern acoustic fidelity.40mm Dynamic Driver with High-Damping Composite Diaphragm
Old Fashioned features an oversized 40mm dynamic driver—rare in compact open-back on-ear designs—achieved through precise structural stacking. By optimizing diaphragm damping and tuning the driver’s resonant frequency (f₀), these headphones deliver deeper, fuller bass than typically possible in mini open-back formats. The result is a warm, fatigue-free tonality that preserves nostalgic charm without sacrificing fidelity.Ergonomic Fit with Adaptive Comfort
Equipped with a telescopic headband and multi-axis swivel hinges, Old Fashioned remains faithful to traditional on-ear ergonomics while improving stability and tactile refinement. Enhanced damping components provide smoother swivel motion and more premium extension feedback, elevating comfort and build quality far beyond vintage models.0.78mm 2-Pin Interchangeable Cable
To expand versatility, Old Fashioned adopts a 0.78mm 2-pin detachable cable design with a reinforced grooved connector structure for improved durability. Users can upgrade or swap cables easily for different setups and scenarios.Modular Detachable Design for Customization
The earcups and headband utilize a modular, fully detachable system. Swivel-ball joints allow the earcups to be removed and replaced with optional accessories such as ear hooks or neckbands, enabling diverse wearing styles tailored to personal preference.Superior Open-Back Frequency Response
The innovative open-back structure, combined with the oversized dynamic driver, achieves excellent frequency response performance. Even through a standard 3.5mm single-ended output, the Old Fashioned attains DF-HRTF-aligned frequency characteristics, ensuring a natural, open, and highly detailed listening experience.Technical Details
Product Name
MOONDROP Old Fashioned 40mm On-Ear Headphone

Model
MD-HP-032

Driver Configuration
Three-Layer Rigid-Flex Composite Diaphragm

Connector
0.78mm 2-Pin

Cable Plug
3.5mm Stereo Plug

Frequency Response
20Hz–32kHz (IEC61094, Free Field)

Effective Frequency Response
20Hz–20kHz (IEC60318-4, –3dB)

Impedance
32Ω ±15% (@1kHz)

Sensitivity
109dB/Vrms (@1kHz)

THD
≤0.2% (@94dB, 1kHz)
Inside the Box

• 1x Old Fashioned Headphone
• 1x Cable
• 1x Manual
• 1x Certificate