Poly Injection ConePolypropylene is a resilient and durable manufactured material. It allows for maximum flexibility that produces great sounding speakers. | Variable High Pass FilterVariable high-pass filter gives you control over the frequencies that pass through to the full range speakers. | Dome TweeterDome tweeters have improved sound dispersion and the shape radiates sound with a wider dispersion pattern than the semi-dome design. Since high-frequency sound waves are very directional, a wider dispersion of the sound waves will give you a larger "sweet spot" to work with when setting up your system | Stamped BaskedStamped baskets have better Resonant Frequencies. This means that the frame is able to absorb and transfer much of the energy produced by the speaker. It is more durable and harder to damage or break, good corrosion resistance, high thermal/electrical conductivity and retains strength at high temperatures |