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over driving the amplifiers turn down the output levels of
the source and then fine adjust the MAQ-104.
EQUALIZATION
Response problems created by the audio environment (the
car’s acoustics) usually can be corrected with a good
quality equalizer that has flexible and precise adjustment.
The MAQ-104 provides this flexibility and precision.
Response problems created by poor system design must
be corrected at the amp and speaker level.
EQUALIZING WITH A REAL TIME
ANALYZER
For best resolution, a
30-band
(1/3-Octave)
Real-time
Analyzer (RTA) or a swept spectrum analyzer with
1/3-Oc-
tave resolution should be used. A lo-band, 1-Octave
resolution RTA will give decent results, but is harder to use.
Either RTA method will require a pink noise generator.
STEP BY STEP
1) Extend MAQ-104 input/output cables and B + , turn-on
and ground to a convenient location outside the vehicle.
(A kit is available from your Hafler dealer.)
2) Test the system to ensure proper function
-
“zero” all pots
and check level by switching the defeat switch quickly.
3) Position microphone and stand in car seat, head height,
ear level (preferably inside ear) with microphone facing
forward. Microphone placement will have a significant
effect on frequency response, and moving the microphone
around in the driver’s area will give a good idea of overall
response.
4) Calibrate RTA.
5) Input pink noise to MAQ-104 on channel corresponding
with microphone placement. Set volume level to 90-100
dB.
5