Frequency Response Readings - HELIX PP50DSP Operating Instructions Manual

Frequency response readings

• Ensure that you have correctly adjusted the time alignment using the HELIX DSP PC-Tool be-
fore you start the measurement.
• Sit in the driver's seat with the measuring microphone.
• It is best to place your PC (Notebook/Netbook) on the passenger seat so that you can use it
easily. Ensure that the screen is not positioned directly in front of the loudspeaker on the pas-
senger side as this can distort the readings.
• Start the "pink noise" reproduction on your car radio. Set the volume to fully cover any ambient
noise. Ideally, the vehicle will be in an enclosed garage while you are taking the measurements
so that traffic noise does not affect the readings, for example.
• Begin by measuring the front loudspeaker system, i.e. initially mute the rear loudspeaker and
any connected subwoofer (e.g. using the HELIX DSP PC-Tool Mute function).
• Hold the measuring microphone upright and gradually turn it to a horizontal position in a semi-
circle between your left and right ears.
• To start taking readings on your PC, press the F12 function key. "Praxis" will now start measu-
ring for approximately 18 seconds.
• You can then identify the determined frequency response together with the red reference curve
on your PC.
• Now use the HELIX DSP-Tool equalizer to adjust the frequency response so that it matches
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