Aesthetic: "Come to the Surface" represents a minimalist aesthetic that dissolves perceptual boundaries. When held in hand, the earphones reveal their dimensional form, yet when worn, they transform into a seamless aural plane. The Surface earphones' design artfully translates spatial curves and intricate textures into a refined two-dimensional surface - a design that reveals hidden depth upon closer appreciation, like an evolving artistic composition. Structure: Is the earphones jack sturdy enough? It appears to be! This reflects the structural design of the Surface earphones. Beyond simply soldering the earphones socket to the crossover circuit board, additional reinforcements are implemented between the cavity and the cover plate. What looks like a decorative metal ring is, in fact, a crucial CNC-machined aluminum reinforcement piece, enhancing the overall durability. Craftsmanship: The principle of simplifying complexity is evident in the craftsmanship of the Surface headphones. Inside the multi-driver headphones, there's a web of intricate wiring and crossover components. These elements are arranged in a way that is both aesthetically pleasing and ensures production consistency, transforming disorder into a neatly organized structure. Specially Developed Crossover Circuit Board: The design of the crossover has undergone extensive comparisons over time, particularly taking into account feedback from audio enthusiasts nationwide. This process has ensured that the final product meets high acoustic standards while also providing an enjoyable listening experience. Dynamic Driver + Quad Balanced Armature: The Surface earphones utilize a physical three-way crossover structure. The speaker unit module has been optimized from various previous models by MOONDROP and incorporates ddHiFi's tuning philosophy. Combined with the specially developed crossover circuit board, these features create a fresh auditory experience, with a balanced frequency distribution ensuring smooth transitions and solid, enjoyable mid-bass frequencies. Standard Upgraded Cable: The Surface earphones come standard with the ddHiFi BC120S cable (4.4mm Balanced Plug + 0.78mm Pins). The E14D (Surface) Hybrid In-Ear Monitors feature a 1DD+4BA hybrid 3-way crossover design, 15Ω impedance, 10Hz–30kHz frequency response, and 118dB/Vrms sensitivity. Crafted with 3D-printed medical-grade resin shells, they include a 0.78-2pin detachable cable and come standard with a 4.4mm balanced plug.