Thank you for viewing. This is a high-end, top-of-the-line earphone from the well-known manufacturer, Noble Audio. I purchased it about two years ago for the retail price of 660,000 yen. The appeal lies in the expressive mid-high frequencies that reach your ears with rich colors, built upon a foundation of responsive low-frequency sound, producing a sound as if you were in a live venue. These are often immediately purchased when listed on Yahoo Auctions. RONIN is Noble Audio's flagship model, inheriting the sound signature of "KATANA," which received high praise for its accurate sound reproduction. Dr. John Moulton, also known as "Wizard," re-examined the driver selection, tuning, and crossover from scratch, dramatically improving the detail expression across all frequency ranges while also achieving a powerful low-frequency response with excellent resolution and speed. The drivers include four electrostatic drivers with clear and very smooth high-frequency and ultra-high-frequency characteristics, four Knowles BA drivers with delicate and lifelike mid-frequency and high-frequency characteristics, and four Sonion BA drivers with powerful transient response and excellent low-frequency and ultra-low-frequency characteristics. RONIN maximizes the strengths of each driver, enabling extremely pure and accurate sound reproduction that doesn't feel muddy, regardless of the music. Driver Configuration: 12 drivers [High-Ultra High Frequency] Sonion Electrostatic Drivers: 4 [Mid-High Frequency] Knowles BA Drivers: 4 [Low Frequency] Sonion BA Drivers: 4 Impedance: 17Ω (1KHz) Sensitivity: 114dB (1KHz) Frequency Response: 10Hz-45kHz Cable Specifications: 7-core shielded structure Core Wire: Double-twisted structure Conductor: Silver-plated copper/Hybrid conductor (Gold-plated OCC copper + Pure copper) Earphone Connector: 2-pin / 0.78mm standard (embedded type) Plug: 4.4mm balanced terminal 64audio empire ears unique melody vision ears shure westone effect audio luminox audio qdc canal works ultimate ears ue jh audio fitears noble audio Returns are not accepted to prevent product substitution.