My question is this, when you purchase these after factory systems for your rides don't you have to take into consideration your wattage output in proportion to the power producing capabilities of your altenator/battery. I mean don't you have to compensate with all that power output with possible upgrades to your existing power supply or add some type of auxilliary power supply to keep from overworking your altenator/generator. I'm a learning novice in this area and would appreciate some different outlooks as how to approach this issue. I have the following in my 79 Fleetwood:

-Panasonic 45/45 watt reciever/cd
-100w jvc amp to push the interiors/after market Kenwoods
-280w mdx amp to push 2 10" subs in a ported box

Nothing fancy but I get a decent sound for my budget.

You may be referring to capacitors which can help provide the "punch" required to produce the bass these kids today want. Some people even wire in a second battery.

The alternator in your fleetwood (63A) should be enough to power your amps no problemo. As long as you have the adequate gauge cables for battey/ground connections you shouldn't have any trouble.

You are right, you have to considerate your alternator when developing a system, aftermarket ones are only worth it in bigger installations.

For your system I don't think you need a capacitor, and a battery will only be useful to keep your system playing for a longer time with the engine off, but it will also represent an additional load to the alternator.