Alpine PXE-H650 User Guide - Page 4

CAUTION Input Level Adjustment The overall sound quality of the PXE-H650 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-H650 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 initial stages of the Set Up sequence. The input to the PXE-H650 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 at about 2/3 to 3/4 of its maximum volume. This position should be remembered (mark the control in some way or remember the Volume number in the display) so if it is ever moved, it can be returned easily to the same position. 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 H650 Setup Disc 1. Track - Auto range setup This track is used with auto ranging to set input levels 2. Track - AntEQ setup This track is used with AntEQ for factory pre-equalization removal 3. Track - Adjust Amp Levels This track is used by the installer to make coarse adjustments to amplifier levels. 6