Capacitors, alternators, and batteries...

Without going in to the whole 'cap or no cap' argument, there are a couple of things worth pointing out:

1. If you decide to go with a cap or an extra battery, it should be placed as close to the load (biggest amp) as possible.

2. Always use substantial power and ground wires...4 ga minimum

3. Adding a cap or extra battery is no replacement for using quality power and ground cable of the correct size, and quality connections

4. Caps and / or extra batteries only do so much...at some point, the alternator will have to be upgraded.

5. Unless you have a totally seperate electrical system for your stereo (seperate alternator, battery, etc.), your headlights may still dim on big bass notes, regardless of how many caps or batteries you have, or how big your aftermarket alternator is. There is still only one source for power. Kind of like when someone flushes the toilet while you are in the shower...the cold water pressure drops due to it being used elsewhere. Same in your car. When the bass hits, the 'water pressure' (voltage) drops, which causes your lights to dim. The extent and duration of the drop will depend on how much current your amp needs at that point, the rate at which it needs it, how fast your alternator can recover, etc., but they will still dim.

Toby