Alpine Tesla Model 3 Y dedicated speaker upgrade. Using a new diaphragm material "hybrid fiber (bulletproof fiber + carbon fiber)" to achieve sweet and transparent mid-low frequencies. The high rigidity carbon fiber embodies the powerful low-frequency impact, while the high toughness bulletproof fiber clearly presents the soft and beautiful mid-range vocals. The mid-range and low-frequency units adopt a unified diaphragm material, achieving a wide frequency range and natural audio source playback.