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Owner’s Enjoyment Manual 11
D. Level Matching
If you have ever listened to a friend’s “killer” car audio
system and heard lots of hiss, clicks or pops, then you have
experienced an improperly level matched system. When a
performance autosound system is properly level matched,
you should get the maximum output from your source unit
and amplifiers without any clipping or that annoying hiss!
The following steps will help you through the process,
although at the end of the day, your ears will be your guides!
1. Set your source units fader and balance controls to
their center positions. If your source unit has subwoofer
output (and you are using it), set the output level at mini-
mum or “0”.
2. Disconnect the connections between your EQS and
the amplifier(s)…otherwise get some ear plugs.
3. Start playing some relatively dynamic music and set
the volume on your source unit to about 3
⁄
4
of maximum.
You should not be hearing anything at this point. If you are
hearing music, go back to step #2; if you are hearing voices
go see a doctor!
4. Starting with the EQS “Front Input” gain control,
increase or decrease the “Input Gain” control until the
“Overload” LED begins to flicker steadily with the music. Do
the same for the “Rear Input” and “Subwoofer Input”.
5. Now adjust the output level control until the “2 volt”
or “5 volt” light starts to flicker. You will set the output
voltage to match up with your amplifiers input gain levels.
If you don’t know how much this is, ASK the amplifier
manufacturer or read the owners manual of the amplifier.
6. Very Important – Set the input gains on the
amplifier(s) at minimum!
7. Double check that you performed Step #6
8. Decrease the volume control on your source unit and
re-connect the RCA’s between the EQS and the amplifier(s).
• Important Note •
For Four Channel Or Speaker Level Input Users: If you
are only using the “Front” and “Rear”
or
“Speaker Level”
inputs, you will find that the subwoofer equalization
now works on the rear channels. Therefore, the “Rear”
input gain is actually controlled by the “Subwoofer”
input gain control.