The Pyle PLMR67B 6 1/2" dual cone waterproof stereo speaker system is perfect for your boat or other marine application, providing great sound on land or at sea. The 2-way waterproof construction and black trim give these speakers a touch of elegance. The 1" aluminum voice coil provides quality mid-range, while the 1/2" dome tweeter fills in the high end. It all sits in a molded ABS basket that keeps your equipment safe and increases its longevity. It has 4 ohm impedance.