Umair, answered your question under amplifiers, let me know your response there, then we can move forward. the Convertoer or Capacitor will probably not be needed running only one amp, but will depend on if your lights dim, Etc. will see about it then, but if you have the money, it can't hurt.
a concerned guy
quit, umair!! throw all of that shi t away!!! dont make a huge mistake and install that garbage into your car!! trust me, you will thank me when you dont. get only Jl audio, alpine, eclipse, or kicker
Umair, I e-mailed you a link to look at, as a concerned guy said "throw it away" is exactly what I told you, however, with your budget, a simple system of good components is not unrealistic, check the site I sent, and let me know.