1'' (25mm) High-bandwidth edge-driven textile dome Tweeter with I-Mount.High-bandwidth edge-driven dome tweeters - These are not commonly used miniature cone tweeters, but full edge-driven domes like those found in high end home audio loudspeakers. The benefits of this full edge-driven topology are reduced distortion at high output levels and superior integration with the mid/woofer. I-Mount (patent no. 5,859,917) tweeter mounting system - This well thought out system allows easy and versatile installation. Tweeter angle can even be adjusted and locked into place to optimize imaging. True Four Ohms ‚¬â€ All Power Series speakers feature two ohm voice coils. Original factory-installed speaker wiring in many cars is 18-22 gauge. This wire, and heating in the voice coil when power is applied, increase the impedance “seen by the amplifier or head unit. The impedance of Power Series has been adjusted to compensate for this increase and can be safely driven by any head unit.