Harman Kardon JBLAlpha 603 6.5"2-Way

JBL Alpha 603 — 6.5" (16cm) 2-way coaxial car speaker with 300W peak / 100W nominal power handling, designed as a direct-fit upgrade for OEM speaker positions in most passenger vehicles.

The Alpha 603 uses a 2-way coaxial design that pairs the woofer and tweeter in a single 6.5" unit for straightforward installation without separate crossover mounting. At 100W nominal and 300W peak power handling, it works with both factory head units and aftermarket amplifiers without risk of overdriving. The 6.5" format fits the most common OEM speaker cutout size across passenger cars, hatchbacks, and SUVs. Durable construction handles the temperature and vibration conditions of in-vehicle use over time.

2-way coaxial design for full-range sound from a single unit

6.5" (16cm) format — most common OEM replacement size

Compatible with factory and aftermarket head units