This depends on where you live. If you live near a medium-sized electronics retail store, they should have a good range of car amplifiers. If location is a problem, you can always buy one online (www.ebay.com or www.Amazon.com) and have it delivered to your house.
In audio look at an amplifier. It will be always a voltage amplifier.
One can find a four channel car amplifier from many different stores. These stores include Best Buy, Walmart, K-Mart, or any store that sells electronics.
The Kicker ZX300.1 Subwoofer Car Amplifier is great.
You can mount your car amplifier in the back floor or in the trunk.
Kenwood is a popular name in audio electronics. One can purchase a car amplifier manufactured by Kenwood at Future Shop, Best Buy, and Visions Electronics. Amazon and eBay also have Kenwood car amplifiers available for purchase.
You can buy a 4 channel cd player and add a crossover and amplifier.
Depends on the output of the amplifier.
No. You buy a waring harness and connect it to the car wiring and the amp to the speakers there behind the radio.
No.
Yes. An amplifier can be added and intergrated into your system.
Sony has the best car amplifier on the market. These are typically more expensive as well.
The point of a car amplifier is the make music sound better, so in most cases all amplifier make music sound better.