Alrighty i drive an 01 Oldsmobile Alero. Its actually nice little car and has some zip to it but right now only 1 front speaker is working as the others are blown out. So I want to just replace the whole sound system. But i just had a couple questions. First, Does having a new headunit or stereo make a big difference? Second Would it be best if i got 2 different amps, one for the front two speakers and one for the subs? Third, Will installing a sound system drain my car battery or should i be fine? Thanks. Any help is appreciated.

alright another thing will someone explain me rms power? why would a 1000 watt amp only give 50 watts of rms power at 4 ohms?

1. Aftermarket decks have pre-out outputs, allowing you to connect amplifiers with RCA cables, whereas a factory deck would need a LOC (line output converter) to convert high input signals to low input signals, meaning you would have to tap into your factory speaker wires to connect an amp up with RCA cables. Aftermarket decks come with more features and put out more power than factory decks (in most cases), but if you are using an external amp for your speakers, then this doesn't really matter. Long story short, it is better to use an aftermarket deck.

2. Yes it would be better that way unless you only plan on running like 200 to 300 watts to your sub or something.

3. Depends how much power you are drawing. If your alternator can keep up with the system, then as long as you have the engine running, the battery will stay charged from the alternator, but if you are running too much power to where your alternator can't keep up, then you will drain your battery and could possibly damage the alternator as well, along with your car audio equipment. If you play your system with the car off, then yes you will drain your battery. Having a good electrical is a very important thing when it comes to car audio.

4. Because that amp doesn't do 1000 watts. I could make an amp, throw a 2000 watt sticker on it and say it does 2000 watts, but that doesn't mean it's true. A lot of the lesser brands way overrate their amps, since people will see a high number for a low price and not know any better. You can kinda give an estimate if the amp does rated by looking at the fusing. 100 watts = ~10 amps of fusing, so if you see an amp that says 3000 watts and uses a 100 amp fuse, its best to stay away from it.

Hope I helped, anymore questions, feel free to ask.

Hey thanks that cleared alot of things up... just one more question though. My car has a crappy stock monsoon system installed... if i disconnect all the wiring from the battery and replace the whole system such as the front speakers, and amp will having the factory amp in the car even matter? thanks.

No but it is quite a bit of work. Save yourself some money and buy a wiring harness. Hey if it works great, If not ur out 14$. Not much of a risk in light of the labor involved in a full install.