Caps do something. And what they do helps a lot. When listening to music with quick, punchy bass..your electrical will take a much softer, more cushoned hit from the amp pressing the subs to hit. However, on longer notes (especially test tones usually played in bass competition) the cap only helps for a very small duration of the actual load put on the electrical system during the VERY (compared to a single bass "punch") LONG duration of a solid, lenghty bass note. Therefor, when playing actual music the capacitor will most likely help regulate your voltage and keep it more stable during fast up-beat barrages of many quick, short bass hits. However, during prolonged series of lenghty bass lines...the capacitor wont help in a noticable ammount.
That is all. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif