Low ESR

Maintains low internal resistance and retains rated capacitance value.

Electrolytic capacitors suffer "aging" effects when compared to all other electronic parts. Electrolytic capacitors age in several ways: They can become electrically leaky, causing a DC current through them that can make them blow up. They can shift in capacitance value. But the most common way they degrade is by a steady increase in their equivalent series resistance. This is the undesired internal resistance that appears in series with the wanted capacitance at a given frequency. 

The ESR of an electrolytic capacitor is normally just a small fraction of an Ohm for a high capacitance, low voltage capacitor (such as a 1000µF, 16V cap.) When the capacitor ages, this resistance increases, and it can completely cease to functio. It's very common to find capacitors that have degraded to 100 times their normal resistance, while their capacitance remains fine! 

Rockford Fosgate capacitors are low ESR, resulting in long lasting, high performance energy storage.

Hybrid Capacitor Design

Hybrid carbon capacitor/electrolytic capacitor combines best of both technologies into single design.