Alpine PXE-H660 Owners Manual - Page 7

Input Level Adjustment The overall sound quality of the PXE-H660 is determined by the adjustments made by the Digital Signal Processor. The accuracy of these adjustments are directly affected by the input to the processor. Therefore, it is very important that the output from the factory radio be properly set so the PXE-H660 receives the correct audio level (not so high that it's distorted and not so low that it's noisy). This ensures that the DSP chip in the unit can see every detail of the audio signal. This important step is done during the intital stages of the Set Up sequence. The input to the PXE-H660 is equipped with an auto-ranging circuit. This keeps the DSP input at a constant level for better noise immunity and signal processing. It is suggested that the factory head unit volume level be set for the maximum undistorted level. To determine the factory system's maximum undistorted volume level, play a well-produced, dynamic music track through the system and turn up the volume until distortion is heard. Back the volume down to the maximum undistorted level. Remember this volume setting, as you will need to keep the factory radio at this setting during steps 5-9 of the setup procedure. Other functions such as factory EQ settings or position settings must also be turned off. Balance and Fader positions must be centered. SETUP CD - Contents Imprint Setup Disc 1. Autorange Setup This track is used with auto ranging to set input levels 2. AntEQ™ Calibration This track is used with AntEQ™ for factory pre-equalization removal 3. Pink Noise This track is used by the installer to make coarse adjustments to amplifier levels. 7