1-Year Local Warranty. Any mention of "us," "we," "our," etc is by qdc, not AV One. The 4-Pro is the new flagship of 4-Drivers earphone from qdc. The 4-Pro was created under the demands of many professionals who participated in the tuning and numerous audiophiles who participated in the experience and evaluation tests, spanning a period of one and a half years and countless refinements before finally set. The 4-Pro fully considers the needs of performing artists and satisfies the wishes of music lovers for multiple usages of one device, simplifying the tuning steps. It integrates the original HiFi, Studio, and Live functions and optimises and enhances the sound. The 4-Pro employs a brand new single-rod linked filter adjustment patent technology, achieving all three modes in one step, offering users a multi-dimensional experience and extremely simple guidance and operation. The three modes are different, but whether it's sound balance, low-frequency diving, high-frequency extension, sound field expansion, or the live concert listening experience, they all achieve breakthrough. One pair of earphone, three functions, three experience. Patent: Single-rod Linkage Filter and Complicated Tuning Adjustment Technology Features: 1. Four BA drivers on one side 2. All drivers customised made 3. Three modes, one-switch adjustment 4. Advanced classic business grey earphone housing 5. Brand new 4C single crystal copper silver-plated cable, grade PU outer sleeve 6. Brand new 3-in-1 replaceable plug, more reliable, more convenient: 3.5mm straight plug, 35mm L-shaped plug, 4.4mm balanced straight plug 7. Brand new storage box 8. Brand new package Technical specifications: Input sensitivity: 105-108dB SPL/mW Frequency response range: 10 - 30000 Hz Impedance: 10-23 ohms Drivers: 4 BA drivers Noise reduction 26 dB Plug: 3-in-1 replaceable plug Cable: Grey 4C copper mono crystal copper silver plated Shell housing: Business grey Technical features: 3-way crossover, 3 sound channels, natural restore, excellent sound quality Category: Custom and universal Frequency response type: 3 kinds Recommended use: Monitoring and music lovers
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