The speakers you choose and how
they are placed are the most important single factors that affect your
car sound.
Coaxial speakers
Coaxial speakers have one
driver in front of another, component speakers or separates have the
drivers separate for separate mounting. More than anything the quality
of the speaker and how it is placed will be the biggest factors for
sound quality, finding a proper balance is more important than it being
coaxial or component, but for flexibility in placement try component
speakers.
Factory speaker location
You can use the factory speaker
locations for simple up-grades, but for high quality systems it is
recommended you use the kick panels that are found under the left and
right sides of your dashboard.
Using kickpanels
When installing your car
speakers, put speakers in the kickpanels. Speakers in the kickpanels
will be more close to the balanced ideal of your home stereo system. The
sound will be placed more in the center of your listening area instead
of to one side.
Custom kickpanels
You can buy custom kick panel
speaker pods for a variety of vehicles they range from 200 and up for
the pair.