With the addition of sub
woofers and high quality speakers, an amplifier is usually needed to
insure proper power.
Speakers
The speakers you choose and how
they are placed are the most important single factors that affect your
car sound.
GPS upgrades
Although many newer more
expensive cars come with a GPS intergraded, it is not a bad idea to
invest in one for your older model vehicle. GPS receivers are accurate
to within 15 meters on average. They also offer a variety of programs
that can prove useful for the business as well as the home.
SIRIUS/XM
Sirius and Xm are the leaders
in satellite radio, many new systems are Satellite Radio Ready, a good
investment considering the efficiency and advantages of such a service.
Capacitors
Adding a quality capacitor is a
good upgrade for advanced stereo systems, a charged capacitor ensures a
constant supply of power should the main power source falter.