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What is a Quasi-Parametric Processor?
A quasi-parametric processor, also known as a parametric surface, does not permit the Q, which is a degree that a range of frequencies can be affected by the equalizer in the car’s stereo system, to be adjusted. On the other hand, the frequencies can still be adjusted by the processor should they need to be. The parametric surface of the processor does all of the work when installed in the stereo system. Once the processor is installed, only set the system once, and then adjust it as needed when the vehicle is on and the stereo system is active with sound.
For more info, see How to Use a Car Audio Equalizer
