Hey i have a 760w amp in my truck with 12'' subs and when my subs start bumpin i guess you could you say my guages blink and at idle my rpm's drop also my voltage guage drops every time the subs hit should i install a bigger alternator or could i go with a bigger pully on the alternator anyone had this problem any help would be great thanks!

 

Neither the alternator, nor pulley. You need a capacitor. They store and release energy very quickly. They are installed in parallel with the power cable going to your amp. The closer to the amp the better.

 

would that be why there is not a really fine point when it hits and how much does a decent one go for

 

that would be why! i got mine for $100 and it works great

 

wats a good brand

 

i used rockford fosgate, seems to be a good one to me but i'm not too into car audio though, i googled it and looked at the reviews of them and got one that everyone said worked good

 

I ran a Fosgate, and a Stinger at different times. I didn't notice a difference between the two. Stinger cost less. I strongly suggest you get a 1 Farad Cap, don't let someone undersell you into a 0.5 Farad.

 

sorry but wats the difference im new to subs

 

Farad rating is essentially how much energy it can hold. With your amp up to 15 feet away from it's power source, it takes a while for the power from the batteries to get to your amp. With a Cap close to your amp, it smooths out the power draw spikes. The alternator can't react quick enough to increase, then decrease it's output to satisfy the draw generated by the amp.
If you understand hydraulics, think of it as an accumulator.

 

alright thanks for the help i will stop at the pawn shop tomorrow