Headphones

Created on 11.13

PMI foam (Polymethacrylimide foam) has become the core preferred material for the driver unit diaphragms of high-end headphones due to its unique material properties . It is widely used in various high-quality headphones such as over-ear and in-ear models, significantly enhancing the user's listening experience by precisely optimizing acoustic performance.

Its core advantages lie in acoustic adaptability: PMI foam can be processed into ultra-thin diaphragms of 0.05-0.1mm through precision technology, with a thickness uniformity error controlled within ±0.005mm. It not only ensures the rigidity of the diaphragm during high-frequency vibration, avoiding sound distortion caused by split vibration, but also has appropriate flexibility to ensure full and natural low-frequency response. Compared with traditional paper, PET or metal diaphragms, the lightweight characteristic of PMI foam diaphragms (density only 0.08-0.12g/cm³) can greatly reduce vibration inertia, improve signal response speed, and achieve high-resolution sound reproduction. It makes high notes clear and transparent with rich details, low notes deep and powerful with sufficient dive, and mid-range vocals delicate and warm, accurately covering the human audible frequency range of 20Hz-20kHz.

At the same time, PMI foam's excellent mechanical stability and environmental resistance can ensure that the diaphragm maintains stable shape during long-term use (within the ambient temperature range of -20℃ to 80℃), and is not prone to aging, deformation or damage due to temperature changes and frequent vibration, extending the service life of headphones. Its low water absorption rate (≤1%) can avoid the impact of humid environments on the acoustic performance of the diaphragm, adapting to the needs of different usage scenarios. In addition, the good molding processability of PMI foam can meet personalized diaphragm design (such as complex curved surfaces like spherical and conical surfaces), helping headphone manufacturers create differentiated acoustic solutions to meet the performance requirements of high-end headphones such as Hi-Fi and noise reduction.