Installing A Car Stereo System


Throughout this project, each component will be required to be
compatible with the other components chosen. The dual purpose for this is to
keep cost factor low and facilitating installation. Several adaptors can be
eliminated by having compatible components. Five major components will be used
in this system, the head unit, the front speakers, the rear speakers, the
subwoofer, and the subwoofer amplifier.

Head Unit

The head unit is the most important component and must have certain
features to make it adequate for this system. Some of the features we will not
be using immediately but will require in case expansion is later desired. There
are four major features required in the head unit, they are internal amplifier,
Pre-amp out RCA jacks, CD controller and a face-off security feature.
The head unit must have an internal amplifier that can produce at least
25 watts-per-channel so it can adequately power a decent pair of speakers.
Reproduction of higher frequency sounds (i.e. violin, flute) as well as lower
frequency sounds (bass violin, tuba) require more power to be heard at the same
level as a midrange sound (voice, trumpet). The internal amplifier in the head
unit must be able to generate enough wattage for the SPL (sound pressure level)
of the higher frequencies to be heard clear in a space the size of the AEROSTAR.


Pre-amp Out RCA Jacks

To allow for low-level amplification without using an in-line power
reducer, the head unit will require low level pre-amplification output jacks.
Head units ordinarily come with either front and rear, or just rear RCA jacks.
This situation will only require rear jacks since the head unit produces enough
wattage sufficient for the front speakers. The sub-woofer system will be
powered by an additional external amplifier by using these jacks.

CD Controller

Although cassettes are more versatile at this point in time, CD\'s are
readily available and deliver a more quality sound. It would be a very good
choice to assure that a CD Controller is built in. One that controls more than
just a specific multi-CD player.

Face-off Security

Full-Panel detatchable security feature will also be required. Most
head units have this as a standard feature making this feature, although
indisposable, readily available. A unit that has mechanical fast-forward,
rewind, and eject buttons will be preferred over a unit that has all these as
electronic features. The reason for this comes apparent if ever a cassette tape
is left in the unit and the tape is to be ejected without having the ignition
key to power the unit.
In the tuner section of the unit, local/distance switchting , dolby
noise reduction and at least 12 FM presets will also be advantageous features in
our head unit.
The head unit we will be using will be the Pioneer model KEH-P4200. It
has a 35 watt-per -channel amplifier built in so it is sufficient for driving
front speakers.
This unit features Multi Function Display (MDF) which allows the
operator of the system to view many different functions of the unit. The
display is an orange colored digital display with the ability to display alpha-
numeric, user programmed titles for the optional compact disc shuttle as well as
the time, date, call letters for the radio station tuned in.
Another feature included is a new F.I.E. (Front Image Enhancer) that
cuts middle and high range frequency output from the rear speakers so that only
low range frequencies are output, for an appearance of voices and higher pitched
instruments to be in front.
The unit is standard size (7"w X 2"h X 5-7/8" d) and uses the standard
auto grounding system and power consumption, allowing an installation without
cutting or drilling and appearing factory installed.
The unit utilizes the face-off anti-theft system, which allows the front
panel of the unit to be removed as a theft deterrent. Pushing a button in the
upper right corner of the panel will eject the panel from the body. To replace
the panel, push the panel into the main body.

Caution: Be very careful in handling the front panel.

Do not leave the panel in direct sunlight or high temperatures
Do not drop the panel or otherwise subject it to strong impact
Do not allow volatile agents (i.e. benzine, thinner, insecticides to
come in contact with the surface of the front of the panel.
Do not touch the contacts on the front panel or on the unit body (see
fig. #)The Pioneer model KEH-P4200 has features that meet the requirements of
this project.

Front Speakers

In this project, the selection