Lightweight, Waterproof, and Minimal Distortion Waterproof Coating For Snow, Rain, And Other Types of Weather Rubber-Edge For Improved Sensitivity Minimal Distortion Highly Sensitive Design Compatible With Car Amplifier Circuits The GF651B is a high performing car speaker that has a split design with both the tweeter and bass unit. They are a highly sensitive design for a more suitable original car amplifier circuit. The GF651B are made with a KAPTON voice coil for a lightweight and low temperature design. This design lends itself to a strong and durable car speaker. The speaker is made from a gradient surface and foamed rubber-edge making the speakers improved for sensitivity and minimal distortion. The GF651B has an aluminium dome tweeter filled with a special magnetic fluid offering only the clearest sound. In addition, the speaker has a waterproof coating made for all weather use. The waterproofing makes these speakers ideal for all different terrains and climates. The GF651B is the most rugged speakers from Edifier.