Infinity is a very clear set of speakers. The cost is high but, well worth the investment. The bass is clean and the highes are very clear.
This depends if you are going for clarity not loudness brands such as Polk Audio, Infinity and Bose are good choices.
Yes it will greatly improve the speaker sound especially for clarity.
Pioneer is a good brand of car amplifiers.
Many people swear that Pioneer makes the best brand.
you can buy very good car speaker radios and an assortment of amps at Radio Shack. It depends on the type and brand of speakers you want. I recommend you stop at some other car parts store too.
Yes They Are Good Brand.
Yes, the Focal 165-CA1 6.5" Car Speaker can function as a good basic speaker without the need of an elaborate system.
There are a variety of good car speaker systems available to the general populace. Some good brands that you may be interested in include Bose and Pioneer.
Yes, Pioneer is definitely a good car stero brand. The Pioneer stero sounds really good in a vehicle and the bass on the Pioneer is very great as well.
NO STAY AWAY
It depends on what kind of speaker you want for your car and how much money you are willing to spend. Bose is probably the best speakers you can buy but is expensive. Kenwood and Polk Audio make good subs. If you want a lot of bass these are the best choice.
The Interstate Batteries are probably the best.