do i need a capacitor

i want to run a 12" sub through a 1 channel amp can anyone tell me if i need a cap and what difference does it make?

thanx.

saiful,

Well the rule is 1.0 farad for every 1000 amps (.5 farad for 500amps).  I am also in a stump on this in another post.

What is the wattage on your Sub and what are you putting out with your Amp?  These are the key determinates.

It all depends on the type of music you listen to.  If you listen to music with a lot quick, sudden hits (rock) a cap would be a great choise.  But if you listen to music with a lot of bass like rap, a cap would be a waist of money

In my opinion you don't need a cap, I would say save your money and opt for a optima battery if you feel that you need to upgrade something..

Personally I don’t have a cap but my friend recons that he can play for longer with the cap than before he had it, aka his battery would run out of juice a lot quicker. Note in an amp the power supply side requires a certain amount of capacitors to supply high drain peaks to prevent the transformer from completely unloading, this can be worked out precisely when designing an amp and quality manufactures will ensure that there is more than adequate capacitance built into the amp. Car batteries take about a tenth of a second to recover from a short high current power draw and caps take less than 1 microsecond to refresh, where caps really save you money is when the supply voltage drops to below 12v, amps will draw more current to make up for the lower voltage and this extra current gets dissipated as a lot of extra heat, with a cap in the middle, aka a 20v cap, voltage will build up in the cap to it's rated voltage and that's what will get dumped to the amp, of course if the battery is to low to charge the cap before the next high draw........smoke!!!!!