How-to-guides for wiring car stereo
amplifier audio inputs
help, for installing car stereo amplifier audio
Now that we have our power
Let's move on to “audio input”.
Audio input is the sound
that you would like to amplify.
In this case, it is your
There are two types of audio
outputs available on car stereos:
Amplified out or "high
Pre amp out or
Amplifier power distribution diagrams
Amplifier audio input diagrams
What is the difference?
Pre amp out or - Low level out
Simply indicates that there
are no amplifiers connected to the output wire of this
connection. The audio signal coming out of this connection (from the
radio) is just enough power to supply an audio amplifier for
Amplified out or - High
Amplified out, indicates that the
audio signal (The music), you are going to amplify is already
amplified from the radios amplifier.
If your radio does not have pre-amp
out, you must have:
Connecting the radio speakers directly
to your inputs, that are not designed for that purpose, will create
large amounts of distortion, and may damage the amplifier!
What type of output signal
should I use?
Well, that depends on your radio capabilities!
The most desirable type of
output is, pre-amp level.
This is because, when an
amplifier in the radio amplifies audio, it will create a specific
amount of distortion.
Distortion is measured by:
When you add a larger
amplifier, you are basically taking the distortion from the radio
amplifier and amplifying the distortion.
So, lets assume your radio
is generating a rate of 1% t.h.d. and the larger amplifier (the one you are
adding). Has 2% t.h.d.
You now have a total distortion rate of 3% t.h.d.
More about output signals
With low level out, you
have minimal distortion, as there is very little amplification.
You can however, purchase
what is called a "High to low level adapter".
This device will bring the
high level down to a low level.
This will help with
distortion rate, however, it will still be there, as the high to low
level adapter will try to remove as much distortion as possible.
For the lowest distortion rate possible, you should choose the higher quality high to low
level adapter, for better audio reproduction.
A High to low level adapter
can be purchased at most audio retail or online stores.
Many amplifiers now come with built in high to low level
You should refer to your owner's manual or it should indicate
on the amplifier "high level in", or may indicate "speaker in".
Click on the link below to continue.