depending on the size of the amps and the size of the caps if it is a .5 farad cap and you have a 500watt total combine rate to the 2 amps put it before the dist block, if it is a 1 farad and the total watts are 1000 put it in the same place , however you only really need it for the bass amp it is the only amp that spike draws the batt and alt. so either way just to the bass amp is a safe bet.