audio technician here...a red top battery will fix it on a large scale, and even a half farad cap would fix it let alone a whole farad. farad caps should run about 50-100 dollars depending on what size you get. you do not need anything with digital meters on it so dont get swallowed into that mess.
-Jason
Jason
00 Audi S4, 2.7 Bi-turbo quattro

01 S10 Xtreme, 4.3l
98' Contour SE with some mods
96 Cavalier (beater)