Fosi Audio IM4

Overview

Open-Back Dynamic Driver System

Customizable Sound Signature

Key specifications

• Key Features:
• 10mm Beryllium-Coated Diaphragm: Utilizes a PU diaphragm with a beryllium coating, designed to deliver smooth mids, punchy bass, and crisp, sparkling high frequencies for a natural and detailed sound
• N52 Dual-Magnet Circuit: Incorporates a powerful N52 dual-magnet system to provide a stable magnetic field, resulting in faster driver response, cleaner dynamics, and a wider dynamic range
• Dual-Chamber Acoustic Design: Features a front chamber with a nine-port design for balanced frequencies and a rear chamber that extends treble detail, with acoustic damping material to absorb standing waves and reduce distortion
• Swappable Sound Nozzles: Includes both aluminum and brass sound nozzles; the aluminum nozzle reduces sibilance for a smoother sound, while the brass nozzle enhances mids and treble for added clarity and sparkle
• Multiple Tuning Ear Tips: Provides three different sets of ear tips (Balanced, Bass, and Deep Bass) to fine-tune the bass response and overall seal to personal preference
• CNC-Machined Aluminum Shells: Housed in precision-milled 6063 aluminum alloy shells that are robust, feature a premium texture, and are lightweight at approximately 7g per earpiece for long-wearing comfort
• Ergonomic Housing Design: Developed using insights from millions of hearing-aid fitting samples to ensure a secure, pressure-free, and comfortable fit for a wide range of ear shapes