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SETTING ANALOG INPUT
LEVELS
1. Install DEQ 30 into your system.
2. With your source unit volume control set at a low
position, test the function of the system. Once
satisfied proceed to the next step.
3. Turn the gain controls of the DEQ 30, your
amplifiers and other components in your system
to their minimum positions.
4. Cue up the reference CD to the track with the 1
kHz test tone at “all bits high”. This is also
referred to as ”0dB.” If you do not have a CD
player, see Non CD Setup.
5. Set your volume on your source unit to 3/4
volume.
6. Slowly turn up the gain controls on the DEQ 30
until you can hear the pure tone. HINT! The
lower the initial volume the better.
7. Turn up your volume of your source unit until the
output of the pure tone becomes distorted
(sounds like fuzziness in the tone) and then turn
back down until you hear a pure tone again. The
maximum undistorted output of the source unit
is now set.
Absorption/Reflection Related Non-Linearity Problems are caused by the interaction of speakers with the
interior acoustics of the vehicle. Examining the speaker mountings and locations may give clues to potential
problems and potential solutions. Be sure the speakers have an un-obstructed path to the listening position. Any
object in the speakers path will affect the sound quality of the system.
Non-Equalizer Solutions
Examine the surrounding of the speaker. If any object blocks the path of the speakers remove it. If this is not
possible, minimize the effect of the obstruction by applying a type of absorption material on the object like felt or
high density fiberglass. Install the absorption material in the path between the speaker and the obstruction so as
to minimize the effect. If the rear of the speaker (midrange or woofer) is close to a reflective panel, place damping
material between the speaker and the reflective baffle. Also if any frequency response errors occur near crossover
points, try changing the speaker polarity of the speaker or try using different crossover frequencies.
Equalizer Solutions
Use the DEQ 30 first as a cut only device to try to smooth out the non-linearity of the system. Cut frequencies
gradually starting with the center point of the problem area. Do not cut the centered band to get the frequency
response to the flat position for it will dip below when you change adjacent bands. When boosting the DEQ 30 is
required, take care not to exceed the maximum undistorted output level of the DEQ 30. For reference, an
illuminated “Clip” LED indicates that the maximum output level has been exceeded. Periodically listen to your
system during this process to make sure that the changes improve the system’s advanced equalization.
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